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Subject: [head tinderbox] failure on mips/mips
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TB --- 2012-11-11 16:26:13 - tinderbox 2.9 running on freebsd-current.sentex.ca
TB --- 2012-11-11 16:26:13 - FreeBSD freebsd-current.sentex.ca 8.3-PRERELEASE FreeBSD 8.3-PRERELEASE #0: Mon Mar 26 13:54:12 EDT 2012 des@freebsd-current.sentex.ca:/usr/obj/usr/src/sys/GENERIC amd64
TB --- 2012-11-11 16:26:13 - starting HEAD tinderbox run for mips/mips
TB --- 2012-11-11 16:26:13 - cleaning the object tree
TB --- 2012-11-11 16:26:13 - checking out /src from svn://svn.freebsd.org/base/head
TB --- 2012-11-11 16:26:13 - cd /tinderbox/HEAD/mips/mips
TB --- 2012-11-11 16:26:13 - /usr/local/bin/svn cleanup /src
TB --- 2012-11-11 16:26:23 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:26:35 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:26:35 - WARNING: sleeping 30 s and retrying...
TB --- 2012-11-11 16:27:05 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:27:18 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:27:18 - WARNING: sleeping 60 s and retrying...
TB --- 2012-11-11 16:28:18 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:28:31 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:28:31 - WARNING: sleeping 90 s and retrying...
TB --- 2012-11-11 16:30:01 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:30:13 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:30:13 - WARNING: sleeping 120 s and retrying...
TB --- 2012-11-11 16:32:13 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:32:26 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:32:26 - ERROR: unable to check out the source tree
TB --- 2012-11-11 16:32:26 - 2.59 user 6.09 system 372.80 real
http://tinderbox.freebsd.org/tinderbox-head-HEAD-mips-mips.full
From owner-freebsd-mips@FreeBSD.ORG Sun Nov 11 16:41:26 2012
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Subject: [releng_8 tinderbox] failure on mips/mips
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TB --- 2012-11-11 16:33:00 - tinderbox 2.9 running on freebsd-legacy2.sentex.ca
TB --- 2012-11-11 16:33:00 - FreeBSD freebsd-legacy2.sentex.ca 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan 3 07:46:30 UTC 2012 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
TB --- 2012-11-11 16:33:00 - starting RELENG_8 tinderbox run for mips/mips
TB --- 2012-11-11 16:33:00 - cleaning the object tree
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TB --- 2012-11-11 16:33:00 - cd /tinderbox/RELENG_8/mips/mips
TB --- 2012-11-11 16:33:00 - /usr/local/bin/svn cleanup /src
TB --- 2012-11-11 16:33:09 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:33:43 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:33:43 - WARNING: sleeping 30 s and retrying...
TB --- 2012-11-11 16:34:13 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:35:03 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:35:03 - WARNING: sleeping 60 s and retrying...
TB --- 2012-11-11 16:36:03 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:36:38 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:36:38 - WARNING: sleeping 90 s and retrying...
TB --- 2012-11-11 16:38:08 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:38:45 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:38:45 - WARNING: sleeping 120 s and retrying...
TB --- 2012-11-11 16:40:45 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:41:22 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:41:22 - ERROR: unable to check out the source tree
TB --- 2012-11-11 16:41:22 - 1.57 user 4.97 system 502.58 real
http://tinderbox.freebsd.org/tinderbox-releng_8-RELENG_8-mips-mips.full
From owner-freebsd-mips@FreeBSD.ORG Sun Nov 11 16:42:32 2012
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TB --- 2012-11-11 16:34:21 - FreeBSD freebsd-stable.sentex.ca 8.3-STABLE FreeBSD 8.3-STABLE #0: Tue Oct 16 17:37:58 UTC 2012 mdtancsa@freebsd-stable.sentex.ca:/usr/obj/usr/src/sys/server amd64
TB --- 2012-11-11 16:34:21 - starting RELENG_9 tinderbox run for mips/mips
TB --- 2012-11-11 16:34:21 - cleaning the object tree
TB --- 2012-11-11 16:34:21 - checking out /src from svn://svn.freebsd.org/base/stable/9
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TB --- 2012-11-11 16:34:21 - /usr/local/bin/svn cleanup /src
TB --- 2012-11-11 16:34:53 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:35:28 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:35:28 - WARNING: sleeping 30 s and retrying...
TB --- 2012-11-11 16:35:58 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:36:25 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:36:25 - WARNING: sleeping 60 s and retrying...
TB --- 2012-11-11 16:37:25 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:37:53 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:37:53 - WARNING: sleeping 90 s and retrying...
TB --- 2012-11-11 16:39:23 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:39:51 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:39:51 - WARNING: sleeping 120 s and retrying...
TB --- 2012-11-11 16:41:51 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:42:28 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:42:28 - ERROR: unable to check out the source tree
TB --- 2012-11-11 16:42:28 - 3.66 user 4.81 system 486.33 real
http://tinderbox.freebsd.org/tinderbox-releng_9-RELENG_9-mips-mips.full
From owner-freebsd-mips@FreeBSD.ORG Sun Nov 11 17:13:57 2012
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TB --- 2012-11-11 15:58:43 - tinderbox 2.9 running on freebsd-current.sentex.ca
TB --- 2012-11-11 15:58:43 - FreeBSD freebsd-current.sentex.ca 8.3-PRERELEASE FreeBSD 8.3-PRERELEASE #0: Mon Mar 26 13:54:12 EDT 2012 des@freebsd-current.sentex.ca:/usr/obj/usr/src/sys/GENERIC amd64
TB --- 2012-11-11 15:58:43 - starting HEAD tinderbox run for mips/mips
TB --- 2012-11-11 15:58:43 - cleaning the object tree
TB --- 2012-11-11 15:58:43 - checking out /src from svn://svn.freebsd.org/base/head
TB --- 2012-11-11 15:58:43 - cd /tinderbox/HEAD/mips/mips
TB --- 2012-11-11 15:58:43 - /usr/local/bin/svn cleanup /src
TB --- 2012-11-11 16:01:10 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:01:22 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:01:22 - WARNING: sleeping 30 s and retrying...
TB --- 2012-11-11 16:01:52 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:02:05 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:02:05 - WARNING: sleeping 60 s and retrying...
TB --- 2012-11-11 16:03:05 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:03:18 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:03:18 - WARNING: sleeping 90 s and retrying...
TB --- 2012-11-11 16:04:48 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:05:00 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:05:00 - WARNING: sleeping 120 s and retrying...
TB --- 2012-11-11 16:07:00 - /usr/local/bin/svn update /src
TB --- 2012-11-11 16:07:13 - WARNING: /usr/local/bin/svn returned exit code 1
TB --- 2012-11-11 16:07:13 - ERROR: unable to check out the source tree
TB --- 2012-11-11 16:07:13 - 2.62 user 4.49 system 510.30 real
http://tinderbox.freebsd.org/tinderbox-head-HEAD-mips-mips.full
From owner-freebsd-mips@FreeBSD.ORG Mon Nov 12 11:06:46 2012
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Note: to view an individual PR, use:
http://www.freebsd.org/cgi/query-pr.cgi?pr=(number).
The following is a listing of current problems submitted by FreeBSD users.
These represent problem reports covering all versions including
experimental development code and obsolete releases.
S Tracker Resp. Description
--------------------------------------------------------------------------------
o kern/165951 mips [ar913x] [ath] DDR flush isn't being done for the WMAC
p kern/163670 mips [mips][arge] arge can't allocate ring buffer on multip
2 problems total.
From owner-freebsd-mips@FreeBSD.ORG Tue Nov 13 20:04:05 2012
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Subject: Re: Memory reserves or lack thereof
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<20121110132019.GP73505@kib.kiev.ua>
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Cc: Konstantin Belousov <kostikbel@gmail.com>, alc@freebsd.org,
mips@freebsd.org, "Sears, Steven" <Steven.Sears@netapp.com>, pho@freebsd.org
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On 11/12/2012 11:35, Alan Cox wrote:
> On 11/12/2012 07:36, Konstantin Belousov wrote:
>> On Sun, Nov 11, 2012 at 03:40:24PM -0600, Alan Cox wrote:
>>> On Sat, Nov 10, 2012 at 7:20 AM, Konstantin Belousov <kostikbel@gmail.com>wrote:
>>>
>>>> On Fri, Nov 09, 2012 at 07:10:04PM +0000, Sears, Steven wrote:
>>>>> I have a memory subsystem design question that I'm hoping someone can
>>>> answer.
>>>>> I've been looking at a machine that is completely out of memory, as in
>>>>>
>>>>> v_free_count = 0,
>>>>> v_cache_count = 0,
>>>>>
>>>>> I wondered how a machine could completely run out of memory like this,
>>>> especially after finding a lack of interrupt storms or other pathologies
>>>> that would tend to overcommit memory. So I started investigating.
>>>>> Most allocators come down to vm_page_alloc(), which has this guard:
>>>>>
>>>>> if ((curproc == pageproc) && (page_req != VM_ALLOC_INTERRUPT)) {
>>>>> page_req = VM_ALLOC_SYSTEM;
>>>>> };
>>>>>
>>>>> if (cnt.v_free_count + cnt.v_cache_count > cnt.v_free_reserved ||
>>>>> (page_req == VM_ALLOC_SYSTEM &&
>>>>> cnt.v_free_count + cnt.v_cache_count >
>>>> cnt.v_interrupt_free_min) ||
>>>>> (page_req == VM_ALLOC_INTERRUPT &&
>>>>> cnt.v_free_count + cnt.v_cache_count > 0)) {
>>>>>
>>>>> The key observation is if VM_ALLOC_INTERRUPT is set, it will allocate
>>>> every last page.
>>>>> >From the name one might expect VM_ALLOC_INTERRUPT to be somewhat rare,
>>>> perhaps only used from interrupt threads. Not so, see kmem_malloc() or
>>>> uma_small_alloc() which both contain this mapping:
>>>>> if ((flags & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>>>>> pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
>>>>> else
>>>>> pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
>>>>>
>>>>> Note that M_USE_RESERVE has been deprecated and is used in just a
>>>> handful of places. Also note that lots of code paths come through these
>>>> routines.
>>>>> What this means is essentially _any_ allocation using M_NOWAIT will
>>>> bypass whatever reserves have been held back and will take every last page
>>>> available.
>>>>> There is no documentation stating M_NOWAIT has this side effect of
>>>> essentially being privileged, so any innocuous piece of code that can't
>>>> block will use it. And of course M_NOWAIT is literally used all over.
>>>>> It looks to me like the design goal of the BSD allocators is on
>>>> recovery; it will give all pages away knowing it can recover.
>>>>> Am I missing anything? I would have expected some small number of pages
>>>> to be held in reserve just in case. And I didn't expect M_NOWAIT to be a
>>>> sort of back door for grabbing memory.
>>>> Your analysis is right, there is nothing to add or correct.
>>>> This is the reason to strongly prefer M_WAITOK.
>>>>
>>> Agreed. Once upon time, before SMPng, M_NOWAIT was rarely used. It was
>>> well understand that it should only be used by interrupt handlers.
>>>
>>> The trouble is that M_NOWAIT conflates two orthogonal things. The obvious
>>> being that the allocation shouldn't sleep. The other being how far we're
>>> willing to deplete the cache/free page queues.
>>>
>>> When fine-grained locking got sprinkled throughout the kernel, we all to
>>> often found ourselves wanting to do allocations without the possibility of
>>> blocking. So, M_NOWAIT became commonplace, where it wasn't before.
>>>
>>> This had the unintended consequence of introducing a lot of memory
>>> allocations in the top-half of the kernel, i.e., non-interrupt handling
>>> code, that were digging deep into the cache/free page queues.
>>>
>>> Also, ironically, in today's kernel an "M_NOWAIT | M_USE_RESERVE"
>>> allocation is less likely to succeed than an "M_NOWAIT" allocation.
>>> However, prior to FreeBSD 7.x, M_NOWAIT couldn't allocate a cached page; it
>>> could only allocate a free page. M_USE_RESERVE said that it ok to allocate
>>> a cached page even though M_NOWAIT was specified. Consequently, the system
>>> wouldn't dig as far into the free page queue if M_USE_RESERVE was
>>> specified, because it was allowed to reclaim a cached page.
>>>
>>> In conclusion, I think it's time that we change M_NOWAIT so that it doesn't
>>> dig any deeper into the cache/free page queues than M_WAITOK does and
>>> reintroduce a M_USE_RESERVE-like flag that says dig deep into the
>>> cache/free page queues. The trouble is that we then need to identify all
>>> of those places that are implicitly depending on the current behavior of
>>> M_NOWAIT also digging deep into the cache/free page queues so that we can
>>> add an explicit M_USE_RESERVE.
>>>
>>> Alan
>>>
>>> P.S. I suspect that we should also increase the size of the "page reserve"
>>> that is kept for VM_ALLOC_INTERRUPT allocations in vm_page_alloc*(). How
>>> many legitimate users of a new M_USE_RESERVE-like flag in today's kernel
>>> could actually be satisfied by two pages?
>> I am almost sure that most of people who put the M_NOWAIT flag, do not
>> know the 'allow the deeper drain of free queue' effect. As such, I believe
>> we should flip the meaning of M_NOWAIT/M_USE_RESERVE. My only expectations
>> of the problematic places would be in the swapout path.
>>
>> I found a single explicit use of M_USE_RESERVE in the kernel,
>> so the flip is relatively simple.
> Agreed. Most recently I eliminated several uses from the arm pmap
> implementations. There is, however, one other use:
>
> ofed/include/linux/gfp.h:#define GFP_ATOMIC (M_NOWAIT |
> M_USE_RESERVE)
>
>> Below is the patch which I only compile-tested on amd64, and which booted
>> fine.
>>
>> Peter, could you, please, give it a run, to see obvious deadlocks, if any ?
>>
>> diff --git a/sys/amd64/amd64/uma_machdep.c b/sys/amd64/amd64/uma_machdep.c
>> index dc9c307..ab1e869 100644
>> --- a/sys/amd64/amd64/uma_machdep.c
>> +++ b/sys/amd64/amd64/uma_machdep.c
>> @@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
>>
>> #include <sys/param.h>
>> #include <sys/lock.h>
>> +#include <sys/malloc.h>
>> #include <sys/mutex.h>
>> #include <sys/systm.h>
>> #include <vm/vm.h>
>> @@ -48,12 +49,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>> int pflags;
>>
>> *flags = UMA_SLAB_PRIV;
>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>> - pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED;
>> - else
>> - pflags = VM_ALLOC_SYSTEM | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED;
>> - if (wait & M_ZERO)
>> - pflags |= VM_ALLOC_ZERO;
>> + pflags = m2vm_flags(wait, VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
>> for (;;) {
>> m = vm_page_alloc(NULL, 0, pflags);
>> if (m == NULL) {
>> diff --git a/sys/arm/arm/vm_machdep.c b/sys/arm/arm/vm_machdep.c
>> index f60cdb1..75366e3 100644
>> --- a/sys/arm/arm/vm_machdep.c
>> +++ b/sys/arm/arm/vm_machdep.c
>> @@ -651,12 +651,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>> ret = ((void *)kmem_malloc(kmem_map, bytes, M_NOWAIT));
>> return (ret);
>> }
>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>> - pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
>> - else
>> - pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
>> - if (wait & M_ZERO)
>> - pflags |= VM_ALLOC_ZERO;
>> + pflags = m2vm_flags(wait, VM_ALLOC_WIRED);
>> for (;;) {
>> m = vm_page_alloc(NULL, 0, pflags | VM_ALLOC_NOOBJ);
>> if (m == NULL) {
>> diff --git a/sys/fs/devfs/devfs_devs.c b/sys/fs/devfs/devfs_devs.c
>> index 71caa29..2ce1ca6 100644
>> --- a/sys/fs/devfs/devfs_devs.c
>> +++ b/sys/fs/devfs/devfs_devs.c
>> @@ -121,7 +121,7 @@ devfs_alloc(int flags)
>> struct cdev *cdev;
>> struct timespec ts;
>>
>> - cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO |
>> + cdp = malloc(sizeof *cdp, M_CDEVP, M_ZERO |
>> ((flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK));
>> if (cdp == NULL)
>> return (NULL);
>> diff --git a/sys/ia64/ia64/uma_machdep.c b/sys/ia64/ia64/uma_machdep.c
>> index 37353ff..9f77762 100644
>> --- a/sys/ia64/ia64/uma_machdep.c
>> +++ b/sys/ia64/ia64/uma_machdep.c
>> @@ -46,12 +46,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>> int pflags;
>>
>> *flags = UMA_SLAB_PRIV;
>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>> - pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
>> - else
>> - pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
>> - if (wait & M_ZERO)
>> - pflags |= VM_ALLOC_ZERO;
>> + pflags = m2vm_flags(wait, VM_ALLOC_WIRED);
>>
>> for (;;) {
>> m = vm_page_alloc(NULL, 0, pflags | VM_ALLOC_NOOBJ);
>> diff --git a/sys/mips/mips/uma_machdep.c b/sys/mips/mips/uma_machdep.c
>> index 798e632..24baef0 100644
>> --- a/sys/mips/mips/uma_machdep.c
>> +++ b/sys/mips/mips/uma_machdep.c
>> @@ -48,11 +48,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>> void *va;
>>
>> *flags = UMA_SLAB_PRIV;
>> -
>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>> - pflags = VM_ALLOC_INTERRUPT;
>> - else
>> - pflags = VM_ALLOC_SYSTEM;
>> + pflags = m2vm_flags(wait, 0);
>>
>> for (;;) {
>> m = pmap_alloc_direct_page(0, pflags);
>
> This smells fishy, but not because of anything that you did. It appears
> that the mips uma_small_alloc() is unconditionally asking for a
> pre-zeroed page. I'll take a look at this later today.
>
I verified this. The current implementation of uma_small_alloc() on
MIPS unconditionally zeroes the page. Moreover, if M_ZERO is specified
to uma_small_alloc(), the same page is zeroed twice, once in
pmap_alloc_direct_page() and again in uma_small_alloc().
I expect to commit the following patch tomorrow. Kostik, it will
trivially conflict with your current patch.
Index: mips/include/pmap.h
===================================================================
--- mips/include/pmap.h (revision 242939)
+++ mips/include/pmap.h (working copy)
@@ -179,7 +179,6 @@ void pmap_kenter_temporary_free(vm_paddr_t pa);
void pmap_flush_pvcache(vm_page_t m);
int pmap_emulate_modified(pmap_t pmap, vm_offset_t va);
void pmap_grow_direct_page_cache(void);
-vm_page_t pmap_alloc_direct_page(unsigned int index, int req);
#endif /* _KERNEL */
Index: mips/mips/pmap.c
===================================================================
--- mips/mips/pmap.c (revision 242939)
+++ mips/mips/pmap.c (working copy)
@@ -163,6 +163,7 @@ static vm_page_t pmap_pv_reclaim(pmap_t locked_pma
static void pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t
va);
static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap,
vm_offset_t va);
+static vm_page_t pmap_alloc_direct_page(unsigned int index, int req);
static vm_page_t pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va,
vm_page_t m, vm_prot_t prot, vm_page_t mpte);
static int pmap_remove_pte(struct pmap *pmap, pt_entry_t *ptq,
vm_offset_t va,
@@ -1041,7 +1042,7 @@ pmap_grow_direct_page_cache()
#endif
}
-vm_page_t
+static vm_page_t
pmap_alloc_direct_page(unsigned int index, int req)
{
vm_page_t m;
Index: mips/mips/uma_machdep.c
===================================================================
--- mips/mips/uma_machdep.c (revision 242939)
+++ mips/mips/uma_machdep.c (working copy)
@@ -50,12 +50,14 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8
*flags = UMA_SLAB_PRIV;
if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
- pflags = VM_ALLOC_INTERRUPT;
+ pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
else
- pflags = VM_ALLOC_SYSTEM;
+ pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
+ if (wait & M_ZERO)
+ pflags |= VM_ALLOC_ZERO;
for (;;) {
- m = pmap_alloc_direct_page(0, pflags);
+ m = vm_page_alloc_freelist(VM_FREELIST_DIRECT, pflags);
if (m == NULL) {
if (wait & M_NOWAIT)
return (NULL);
From owner-freebsd-mips@FreeBSD.ORG Tue Nov 13 20:13:34 2012
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References: <A6DE036C6A90C949A25CE89E844237FB2086970A@SACEXCMBX01-PRD.hq.netapp.com>
<20121110132019.GP73505@kib.kiev.ua>
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<20121112133638.GZ73505@kib.kiev.ua> <50A1336E.5040401@rice.edu>
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Date: Tue, 13 Nov 2012 12:13:33 -0800
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Subject: Re: Memory reserves or lack thereof
From: Adrian Chadd <adrian@freebsd.org>
To: Alan Cox <alc@rice.edu>
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Cc: mips@freebsd.org, "Sears, Steven" <Steven.Sears@netapp.com>,
alc@freebsd.org, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
pho@freebsd.org, Konstantin Belousov <kostikbel@gmail.com>
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Hey, great catch!
adrian
On 13 November 2012 12:04, Alan Cox <alc@rice.edu> wrote:
> On 11/12/2012 11:35, Alan Cox wrote:
>> On 11/12/2012 07:36, Konstantin Belousov wrote:
>>> On Sun, Nov 11, 2012 at 03:40:24PM -0600, Alan Cox wrote:
>>>> On Sat, Nov 10, 2012 at 7:20 AM, Konstantin Belousov <kostikbel@gmail.com>wrote:
>>>>
>>>>> On Fri, Nov 09, 2012 at 07:10:04PM +0000, Sears, Steven wrote:
>>>>>> I have a memory subsystem design question that I'm hoping someone can
>>>>> answer.
>>>>>> I've been looking at a machine that is completely out of memory, as in
>>>>>>
>>>>>> v_free_count = 0,
>>>>>> v_cache_count = 0,
>>>>>>
>>>>>> I wondered how a machine could completely run out of memory like this,
>>>>> especially after finding a lack of interrupt storms or other pathologies
>>>>> that would tend to overcommit memory. So I started investigating.
>>>>>> Most allocators come down to vm_page_alloc(), which has this guard:
>>>>>>
>>>>>> if ((curproc == pageproc) && (page_req != VM_ALLOC_INTERRUPT)) {
>>>>>> page_req = VM_ALLOC_SYSTEM;
>>>>>> };
>>>>>>
>>>>>> if (cnt.v_free_count + cnt.v_cache_count > cnt.v_free_reserved ||
>>>>>> (page_req == VM_ALLOC_SYSTEM &&
>>>>>> cnt.v_free_count + cnt.v_cache_count >
>>>>> cnt.v_interrupt_free_min) ||
>>>>>> (page_req == VM_ALLOC_INTERRUPT &&
>>>>>> cnt.v_free_count + cnt.v_cache_count > 0)) {
>>>>>>
>>>>>> The key observation is if VM_ALLOC_INTERRUPT is set, it will allocate
>>>>> every last page.
>>>>>> >From the name one might expect VM_ALLOC_INTERRUPT to be somewhat rare,
>>>>> perhaps only used from interrupt threads. Not so, see kmem_malloc() or
>>>>> uma_small_alloc() which both contain this mapping:
>>>>>> if ((flags & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>>>>>> pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
>>>>>> else
>>>>>> pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
>>>>>>
>>>>>> Note that M_USE_RESERVE has been deprecated and is used in just a
>>>>> handful of places. Also note that lots of code paths come through these
>>>>> routines.
>>>>>> What this means is essentially _any_ allocation using M_NOWAIT will
>>>>> bypass whatever reserves have been held back and will take every last page
>>>>> available.
>>>>>> There is no documentation stating M_NOWAIT has this side effect of
>>>>> essentially being privileged, so any innocuous piece of code that can't
>>>>> block will use it. And of course M_NOWAIT is literally used all over.
>>>>>> It looks to me like the design goal of the BSD allocators is on
>>>>> recovery; it will give all pages away knowing it can recover.
>>>>>> Am I missing anything? I would have expected some small number of pages
>>>>> to be held in reserve just in case. And I didn't expect M_NOWAIT to be a
>>>>> sort of back door for grabbing memory.
>>>>> Your analysis is right, there is nothing to add or correct.
>>>>> This is the reason to strongly prefer M_WAITOK.
>>>>>
>>>> Agreed. Once upon time, before SMPng, M_NOWAIT was rarely used. It was
>>>> well understand that it should only be used by interrupt handlers.
>>>>
>>>> The trouble is that M_NOWAIT conflates two orthogonal things. The obvious
>>>> being that the allocation shouldn't sleep. The other being how far we're
>>>> willing to deplete the cache/free page queues.
>>>>
>>>> When fine-grained locking got sprinkled throughout the kernel, we all to
>>>> often found ourselves wanting to do allocations without the possibility of
>>>> blocking. So, M_NOWAIT became commonplace, where it wasn't before.
>>>>
>>>> This had the unintended consequence of introducing a lot of memory
>>>> allocations in the top-half of the kernel, i.e., non-interrupt handling
>>>> code, that were digging deep into the cache/free page queues.
>>>>
>>>> Also, ironically, in today's kernel an "M_NOWAIT | M_USE_RESERVE"
>>>> allocation is less likely to succeed than an "M_NOWAIT" allocation.
>>>> However, prior to FreeBSD 7.x, M_NOWAIT couldn't allocate a cached page; it
>>>> could only allocate a free page. M_USE_RESERVE said that it ok to allocate
>>>> a cached page even though M_NOWAIT was specified. Consequently, the system
>>>> wouldn't dig as far into the free page queue if M_USE_RESERVE was
>>>> specified, because it was allowed to reclaim a cached page.
>>>>
>>>> In conclusion, I think it's time that we change M_NOWAIT so that it doesn't
>>>> dig any deeper into the cache/free page queues than M_WAITOK does and
>>>> reintroduce a M_USE_RESERVE-like flag that says dig deep into the
>>>> cache/free page queues. The trouble is that we then need to identify all
>>>> of those places that are implicitly depending on the current behavior of
>>>> M_NOWAIT also digging deep into the cache/free page queues so that we can
>>>> add an explicit M_USE_RESERVE.
>>>>
>>>> Alan
>>>>
>>>> P.S. I suspect that we should also increase the size of the "page reserve"
>>>> that is kept for VM_ALLOC_INTERRUPT allocations in vm_page_alloc*(). How
>>>> many legitimate users of a new M_USE_RESERVE-like flag in today's kernel
>>>> could actually be satisfied by two pages?
>>> I am almost sure that most of people who put the M_NOWAIT flag, do not
>>> know the 'allow the deeper drain of free queue' effect. As such, I believe
>>> we should flip the meaning of M_NOWAIT/M_USE_RESERVE. My only expectations
>>> of the problematic places would be in the swapout path.
>>>
>>> I found a single explicit use of M_USE_RESERVE in the kernel,
>>> so the flip is relatively simple.
>> Agreed. Most recently I eliminated several uses from the arm pmap
>> implementations. There is, however, one other use:
>>
>> ofed/include/linux/gfp.h:#define GFP_ATOMIC (M_NOWAIT |
>> M_USE_RESERVE)
>>
>>> Below is the patch which I only compile-tested on amd64, and which booted
>>> fine.
>>>
>>> Peter, could you, please, give it a run, to see obvious deadlocks, if any ?
>>>
>>> diff --git a/sys/amd64/amd64/uma_machdep.c b/sys/amd64/amd64/uma_machdep.c
>>> index dc9c307..ab1e869 100644
>>> --- a/sys/amd64/amd64/uma_machdep.c
>>> +++ b/sys/amd64/amd64/uma_machdep.c
>>> @@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
>>>
>>> #include <sys/param.h>
>>> #include <sys/lock.h>
>>> +#include <sys/malloc.h>
>>> #include <sys/mutex.h>
>>> #include <sys/systm.h>
>>> #include <vm/vm.h>
>>> @@ -48,12 +49,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>>> int pflags;
>>>
>>> *flags = UMA_SLAB_PRIV;
>>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>>> - pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED;
>>> - else
>>> - pflags = VM_ALLOC_SYSTEM | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED;
>>> - if (wait & M_ZERO)
>>> - pflags |= VM_ALLOC_ZERO;
>>> + pflags = m2vm_flags(wait, VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
>>> for (;;) {
>>> m = vm_page_alloc(NULL, 0, pflags);
>>> if (m == NULL) {
>>> diff --git a/sys/arm/arm/vm_machdep.c b/sys/arm/arm/vm_machdep.c
>>> index f60cdb1..75366e3 100644
>>> --- a/sys/arm/arm/vm_machdep.c
>>> +++ b/sys/arm/arm/vm_machdep.c
>>> @@ -651,12 +651,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>>> ret = ((void *)kmem_malloc(kmem_map, bytes, M_NOWAIT));
>>> return (ret);
>>> }
>>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>>> - pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
>>> - else
>>> - pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
>>> - if (wait & M_ZERO)
>>> - pflags |= VM_ALLOC_ZERO;
>>> + pflags = m2vm_flags(wait, VM_ALLOC_WIRED);
>>> for (;;) {
>>> m = vm_page_alloc(NULL, 0, pflags | VM_ALLOC_NOOBJ);
>>> if (m == NULL) {
>>> diff --git a/sys/fs/devfs/devfs_devs.c b/sys/fs/devfs/devfs_devs.c
>>> index 71caa29..2ce1ca6 100644
>>> --- a/sys/fs/devfs/devfs_devs.c
>>> +++ b/sys/fs/devfs/devfs_devs.c
>>> @@ -121,7 +121,7 @@ devfs_alloc(int flags)
>>> struct cdev *cdev;
>>> struct timespec ts;
>>>
>>> - cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO |
>>> + cdp = malloc(sizeof *cdp, M_CDEVP, M_ZERO |
>>> ((flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK));
>>> if (cdp == NULL)
>>> return (NULL);
>>> diff --git a/sys/ia64/ia64/uma_machdep.c b/sys/ia64/ia64/uma_machdep.c
>>> index 37353ff..9f77762 100644
>>> --- a/sys/ia64/ia64/uma_machdep.c
>>> +++ b/sys/ia64/ia64/uma_machdep.c
>>> @@ -46,12 +46,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>>> int pflags;
>>>
>>> *flags = UMA_SLAB_PRIV;
>>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>>> - pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
>>> - else
>>> - pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
>>> - if (wait & M_ZERO)
>>> - pflags |= VM_ALLOC_ZERO;
>>> + pflags = m2vm_flags(wait, VM_ALLOC_WIRED);
>>>
>>> for (;;) {
>>> m = vm_page_alloc(NULL, 0, pflags | VM_ALLOC_NOOBJ);
>>> diff --git a/sys/mips/mips/uma_machdep.c b/sys/mips/mips/uma_machdep.c
>>> index 798e632..24baef0 100644
>>> --- a/sys/mips/mips/uma_machdep.c
>>> +++ b/sys/mips/mips/uma_machdep.c
>>> @@ -48,11 +48,7 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
>>> void *va;
>>>
>>> *flags = UMA_SLAB_PRIV;
>>> -
>>> - if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
>>> - pflags = VM_ALLOC_INTERRUPT;
>>> - else
>>> - pflags = VM_ALLOC_SYSTEM;
>>> + pflags = m2vm_flags(wait, 0);
>>>
>>> for (;;) {
>>> m = pmap_alloc_direct_page(0, pflags);
>>
>> This smells fishy, but not because of anything that you did. It appears
>> that the mips uma_small_alloc() is unconditionally asking for a
>> pre-zeroed page. I'll take a look at this later today.
>>
>
> I verified this. The current implementation of uma_small_alloc() on
> MIPS unconditionally zeroes the page. Moreover, if M_ZERO is specified
> to uma_small_alloc(), the same page is zeroed twice, once in
> pmap_alloc_direct_page() and again in uma_small_alloc().
>
> I expect to commit the following patch tomorrow. Kostik, it will
> trivially conflict with your current patch.
>
> Index: mips/include/pmap.h
> ===================================================================
> --- mips/include/pmap.h (revision 242939)
> +++ mips/include/pmap.h (working copy)
> @@ -179,7 +179,6 @@ void pmap_kenter_temporary_free(vm_paddr_t pa);
> void pmap_flush_pvcache(vm_page_t m);
> int pmap_emulate_modified(pmap_t pmap, vm_offset_t va);
> void pmap_grow_direct_page_cache(void);
> -vm_page_t pmap_alloc_direct_page(unsigned int index, int req);
>
> #endif /* _KERNEL */
>
> Index: mips/mips/pmap.c
> ===================================================================
> --- mips/mips/pmap.c (revision 242939)
> +++ mips/mips/pmap.c (working copy)
> @@ -163,6 +163,7 @@ static vm_page_t pmap_pv_reclaim(pmap_t locked_pma
> static void pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t
> va);
> static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap,
> vm_offset_t va);
> +static vm_page_t pmap_alloc_direct_page(unsigned int index, int req);
> static vm_page_t pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va,
> vm_page_t m, vm_prot_t prot, vm_page_t mpte);
> static int pmap_remove_pte(struct pmap *pmap, pt_entry_t *ptq,
> vm_offset_t va,
> @@ -1041,7 +1042,7 @@ pmap_grow_direct_page_cache()
> #endif
> }
>
> -vm_page_t
> +static vm_page_t
> pmap_alloc_direct_page(unsigned int index, int req)
> {
> vm_page_t m;
> Index: mips/mips/uma_machdep.c
> ===================================================================
> --- mips/mips/uma_machdep.c (revision 242939)
> +++ mips/mips/uma_machdep.c (working copy)
> @@ -50,12 +50,14 @@ uma_small_alloc(uma_zone_t zone, int bytes, u_int8
> *flags = UMA_SLAB_PRIV;
>
> if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
> - pflags = VM_ALLOC_INTERRUPT;
> + pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
> else
> - pflags = VM_ALLOC_SYSTEM;
> + pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
> + if (wait & M_ZERO)
> + pflags |= VM_ALLOC_ZERO;
>
> for (;;) {
> - m = pmap_alloc_direct_page(0, pflags);
> + m = vm_page_alloc_freelist(VM_FREELIST_DIRECT, pflags);
> if (m == NULL) {
> if (wait & M_NOWAIT)
> return (NULL);
>
> _______________________________________________
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> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
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Subject: Trying FreeBSD on AR71XX
From: Mukunda Haveri <mukunda@pointred.co>
To: freebsd-mips@freebsd.org
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Hi,
I am currently trying out starting the freebsd kernel on AR7130 board.
Midway through the booting process, I get an error "ELF Error : -13".
Anyone has an idea what is going on ?
Additionally, when I try to boot the same image using a redboot loader, I
get the following message,
"Only absolute ELF images supported"
I am stuck and would appreciate help.
Thanks,
HSM
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From owner-freebsd-mips@FreeBSD.ORG Thu Nov 15 09:30:21 2012
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Subject: Re: Trying FreeBSD on AR71XX
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Content preview: On 2012-11-15, at 12:38 AM,
Mukunda Haveri <mukunda@pointred.co>
wrote: > Hi, > I am currently trying out starting the freebsd kernel on AR7130
board. > Midway through the booting process, I get an error "ELF Error :
-13". > Anyone has an idea what is going on ? > > Additionally, when I try
to boot the same image using a redboot loader, I > get the following message,
> "Only absolute ELF images supported" > I am stuck and would appreciate
help. [...]
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On 2012-11-15, at 12:38 AM, Mukunda Haveri <mukunda@pointred.co> wrote:
> Hi,
> I am currently trying out starting the freebsd kernel on AR7130 board.
> Midway through the booting process, I get an error "ELF Error : -13".
> Anyone has an idea what is going on ?
>
> Additionally, when I try to boot the same image using a redboot loader, I
> get the following message,
> "Only absolute ELF images supported"
> I am stuck and would appreciate help.
AFAIR this one was due to wrong byte order of kernel ELF image.
Try setting TARGET_ARCH to mipsel if it's not set or set to mips.
From owner-freebsd-mips@FreeBSD.ORG Thu Nov 15 18:25:28 2012
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Date: Thu, 15 Nov 2012 12:25:21 -0600
From: Alan Cox <alc@rice.edu>
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Given the possibility of L1 cache aliasing on some (many?) MIPS
processors, I think that you, i.e., MIPS users, should evaluate the
performance effects of the following change:
Index: mips/include/vmparam.h
===================================================================
--- mips/include/vmparam.h (revision 243091)
+++ mips/include/vmparam.h (working copy)
@@ -190,6 +190,6 @@
*/
#define VM_NFREEORDER 9
-#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
+#define ZERO_REGION_SIZE 4096
#endif /* !_MACHINE_VMPARAM_H_ */
You can quantify the impact with a simple test like:
dd if=/dev/zero of=/dev/null bs=<64 or 128>k count=<something non-trivial>
If possible, please use a kernel without WITNESS or INVARIANTS.
Alan
P.S. I would also be curious how setting this to 8192 would perform.
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Subject: Re: ZERO_REGION_SIZE
From: Adrian Chadd <adrian@freebsd.org>
To: Alan Cox <alc@rice.edu>
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Alan, would you like me to send you some MIPS hardwarE?
Adrian
On 15 November 2012 10:25, Alan Cox <alc@rice.edu> wrote:
> Given the possibility of L1 cache aliasing on some (many?) MIPS
> processors, I think that you, i.e., MIPS users, should evaluate the
> performance effects of the following change:
>
> Index: mips/include/vmparam.h
> ===================================================================
> --- mips/include/vmparam.h (revision 243091)
> +++ mips/include/vmparam.h (working copy)
> @@ -190,6 +190,6 @@
> */
> #define VM_NFREEORDER 9
>
> -#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
> +#define ZERO_REGION_SIZE 4096
>
> #endif /* !_MACHINE_VMPARAM_H_ */
>
> You can quantify the impact with a simple test like:
>
> dd if=/dev/zero of=/dev/null bs=<64 or 128>k count=<something non-trivial>
>
> If possible, please use a kernel without WITNESS or INVARIANTS.
>
> Alan
>
> P.S. I would also be curious how setting this to 8192 would perform.
>
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On 11/15/2012 13:09, Adrian Chadd wrote:
> Alan, would you like me to send you some MIPS hardwarE?
Let me think about that. Now may not be the right time, but I suspect
that I'll take you up on that offer in a few months. In the meantime,
I'll say that I've always got prompt responses to my requests for
testing from people on this list, particularly jchandra@. So, I don't
feel like progress on MIPS VM issues is being slowed much by my lack of
hardware.
Thanks,
Alan
P.S. I would encourage someone with hardware to look into implementing a
non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
this. Basically, most pmap_enter() calls are doing an ffs*().
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On Nov 15, 2012, at 1:13 PM, Alan Cox wrote:
> P.S. I would encourage someone with hardware to look into implementing =
a
> non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
> this. Basically, most pmap_enter() calls are doing an ffs*().
ffs finds the first bit set. clz counts the number of leading zeros and =
thus finds the last bit set. Would a non-iterative fls* be helpful?
Warner
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Subject: Re: ZERO_REGION_SIZE
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On Thu, Nov 15, 2012 at 1:07 PM, Warner Losh <imp@bsdimp.com> wrote:
>
> On Nov 15, 2012, at 1:13 PM, Alan Cox wrote:
> > P.S. I would encourage someone with hardware to look into implementing a
> > non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
> > this. Basically, most pmap_enter() calls are doing an ffs*().
>
> ffs finds the first bit set. clz counts the number of leading zeros and
> thus finds the last bit set. Would a non-iterative fls* be helpful?
>
Right. And no widespread ctz/ffs MIPS instructions as far as I know. We
could use pop/dpop on processors that support them to do non-iterative
ffs*, with a few additional instructions, though.
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From: Patrick Kelsey <kelsey@ieee.org>
To: Juli Mallett <jmallett@freebsd.org>
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On Thu, Nov 15, 2012 at 5:02 PM, Juli Mallett <jmallett@freebsd.org> wrote:
> On Thu, Nov 15, 2012 at 1:07 PM, Warner Losh <imp@bsdimp.com> wrote:
>
>>
>> On Nov 15, 2012, at 1:13 PM, Alan Cox wrote:
>> > P.S. I would encourage someone with hardware to look into implementing a
>> > non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
>> > this. Basically, most pmap_enter() calls are doing an ffs*().
>>
>> ffs finds the first bit set. clz counts the number of leading zeros and
>> thus finds the last bit set. Would a non-iterative fls* be helpful?
>>
>
> Right. And no widespread ctz/ffs MIPS instructions as far as I know. We
> could use pop/dpop on processors that support them to do non-iterative
> ffs*, with a few additional instructions, though.
I was thinking something like this might work:
value to ffs is in r1, MSB is the index of the MSB (so, 31 or 63):
if (0 == r1) return(your_choice);
r2 = r1 - 1;
r2 = r1 ^ r2;
return (MSB - clz(r2));
-Patrick
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On Nov 15, 2012, at 3:11 PM, Patrick Kelsey wrote:
> On Thu, Nov 15, 2012 at 5:02 PM, Juli Mallett <jmallett@freebsd.org> wrote:
>> On Thu, Nov 15, 2012 at 1:07 PM, Warner Losh <imp@bsdimp.com> wrote:
>>
>>>
>>> On Nov 15, 2012, at 1:13 PM, Alan Cox wrote:
>>>> P.S. I would encourage someone with hardware to look into implementing a
>>>> non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
>>>> this. Basically, most pmap_enter() calls are doing an ffs*().
>>>
>>> ffs finds the first bit set. clz counts the number of leading zeros and
>>> thus finds the last bit set. Would a non-iterative fls* be helpful?
>>>
>>
>> Right. And no widespread ctz/ffs MIPS instructions as far as I know. We
>> could use pop/dpop on processors that support them to do non-iterative
>> ffs*, with a few additional instructions, though.
>
> I was thinking something like this might work:
>
> value to ffs is in r1, MSB is the index of the MSB (so, 31 or 63):
>
> if (0 == r1) return(your_choice);
> r2 = r1 - 1;
> r2 = r1 ^ r2;
> return (MSB - clz(r2));
Turns out NetBSD has one that does exactly this...
Warner
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Subject: Re: ZERO_REGION_SIZE
From: Patrick Kelsey <kelsey@ieee.org>
To: Warner Losh <imp@bsdimp.com>
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On Thu, Nov 15, 2012 at 5:25 PM, Warner Losh <imp@bsdimp.com> wrote:
>
> On Nov 15, 2012, at 3:11 PM, Patrick Kelsey wrote:
>
>> On Thu, Nov 15, 2012 at 5:02 PM, Juli Mallett <jmallett@freebsd.org> wrote:
>>> On Thu, Nov 15, 2012 at 1:07 PM, Warner Losh <imp@bsdimp.com> wrote:
>>>
>>>>
>>>> On Nov 15, 2012, at 1:13 PM, Alan Cox wrote:
>>>>> P.S. I would encourage someone with hardware to look into implementing a
>>>>> non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
>>>>> this. Basically, most pmap_enter() calls are doing an ffs*().
>>>>
>>>> ffs finds the first bit set. clz counts the number of leading zeros and
>>>> thus finds the last bit set. Would a non-iterative fls* be helpful?
>>>>
>>>
>>> Right. And no widespread ctz/ffs MIPS instructions as far as I know. We
>>> could use pop/dpop on processors that support them to do non-iterative
>>> ffs*, with a few additional instructions, though.
>>
>> I was thinking something like this might work:
>>
>> value to ffs is in r1, MSB is the index of the MSB (so, 31 or 63):
>>
>> if (0 == r1) return(your_choice);
>> r2 = r1 - 1;
>> r2 = r1 ^ r2;
>> return (MSB - clz(r2));
>
>
> Turns out NetBSD has one that does exactly this...
>
And now that I've gotten away from silly pencil and paper and back to
the glare of the internet, I see gcc has had __builtin_ffs for some
time...
From owner-freebsd-mips@FreeBSD.ORG Thu Nov 15 23:09:51 2012
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On 11/15/2012 3:07 PM, Warner Losh wrote:
> On Nov 15, 2012, at 1:13 PM, Alan Cox wrote:
>> P.S. I would encourage someone with hardware to look into implementing a
>> non-iterative ffs*() using (d)clz. The MIPS pmap would benefit from
>> this. Basically, most pmap_enter() calls are doing an ffs*().
> ffs finds the first bit set. clz counts the number of leading zeros and thus finds the last bit set. Would a non-iterative fls* be helpful?
The code could probably use fls* in place of ffs*. In any case, there's
a standard trick for using (d)clz to implement a non-iterative ffs*.
Alan
From owner-freebsd-mips@FreeBSD.ORG Fri Nov 16 01:36:25 2012
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Subject: heads up - changing uart -> uart_ar71xx
From: Adrian Chadd <adrian@freebsd.org>
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Hi all,
I've started digging into AR933x support and I've discovered that the
UART is not an NS8250 style thing.
So I'm going to shuffle the ar71xx uart code around to require both
'uart' and 'uart_ar71xx'.
I'll update the config files appropriately.
Thanks!
Adrian
From owner-freebsd-mips@FreeBSD.ORG Fri Nov 16 17:37:58 2012
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Subject: Re: heads up - changing uart -> uart_ar71xx
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This should be cleaned up better than that, what -kind- of uart is it?
There should be things called
uart_8250 (should be able to drive everything from 8250 to 16950)
uart_8530 (this is probalby the second most common uart in the world)
uart_6850 (we would probably never see one of these)
etc...
Please do not lock this to a specific Mips chip if at all possible
> Hi all,
>
> I've started digging into AR933x support and I've discovered that the
> UART is not an NS8250 style thing.
>
> So I'm going to shuffle the ar71xx uart code around to require both
> 'uart' and 'uart_ar71xx'.
>
> I'll update the config files appropriately.
>
> Thanks!
>
>
>
> Adrian
> _______________________________________________
> freebsd-mips@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-mips
> To unsubscribe, send any mail to "freebsd-mips-unsubscribe@freebsd.org"
>
--
Rod Grimes freebsd@freebsd.org
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On Nov 16, 2012, at 10:35 AM, Rodney W. Grimes wrote:
> This should be cleaned up better than that, what -kind- of uart is it?
> There should be things called
> uart_8250 (should be able to drive everything from 8250 to =
16950)
> uart_8530 (this is probalby the second most common uart in the =
world)
> uart_6850 (we would probably never see one of these)
> etc...
>=20
> Please do not lock this to a specific Mips chip if at all possible
uart already services a dozen of other UARTs. It isn't tied to MIPS at =
all. All Adrian seems to be doing is making what was automatic =
configuration a little more manual.
Warner
>> Hi all,
>>=20
>> I've started digging into AR933x support and I've discovered that the
>> UART is not an NS8250 style thing.
>>=20
>> So I'm going to shuffle the ar71xx uart code around to require both
>> 'uart' and 'uart_ar71xx'.
>>=20
>> I'll update the config files appropriately.
>>=20
>> Thanks!
>>=20
>>=20
>>=20
>> Adrian
>> _______________________________________________
>> freebsd-mips@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-mips
>> To unsubscribe, send any mail to =
"freebsd-mips-unsubscribe@freebsd.org"
>>=20
>=20
> --=20
> Rod Grimes =
freebsd@freebsd.org
> _______________________________________________
> freebsd-mips@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-mips
> To unsubscribe, send any mail to =
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Subject: Re: heads up - changing uart -> uart_ar71xx
From: Adrian Chadd <adrian@freebsd.org>
To: Warner Losh <imp@bsdimp.com>
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On 16 November 2012 10:01, Warner Losh <imp@bsdimp.com> wrote:
>
> On Nov 16, 2012, at 10:35 AM, Rodney W. Grimes wrote:
>
>> This should be cleaned up better than that, what -kind- of uart is it?
>> There should be things called
>> uart_8250 (should be able to drive everything from 8250 to 16950)
>> uart_8530 (this is probalby the second most common uart in the world)
>> uart_6850 (we would probably never see one of these)
>> etc...
>>
>> Please do not lock this to a specific Mips chip if at all possible
>
> uart already services a dozen of other UARTs. It isn't tied to MIPS at all. All Adrian seems to be doing is making what was automatic configuration a little more manual.
Well, strictly speaking yes. But what I'll do later is make a
'uart_core' and then allow my MIPS platforms to only register the
uart(s) they need.
Right now it includes all of the uarts in sys/dev/uart/. They're not
separate devices.
Adrian
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On Nov 16, 2012, at 11:03 AM, Adrian Chadd wrote:
> On 16 November 2012 10:01, Warner Losh <imp@bsdimp.com> wrote:
>>=20
>> On Nov 16, 2012, at 10:35 AM, Rodney W. Grimes wrote:
>>=20
>>> This should be cleaned up better than that, what -kind- of uart is =
it?
>>> There should be things called
>>> uart_8250 (should be able to drive everything from 8250 to =
16950)
>>> uart_8530 (this is probalby the second most common uart in the =
world)
>>> uart_6850 (we would probably never see one of these)
>>> etc...
>>>=20
>>> Please do not lock this to a specific Mips chip if at all possible
>>=20
>> uart already services a dozen of other UARTs. It isn't tied to MIPS =
at all. All Adrian seems to be doing is making what was automatic =
configuration a little more manual.
>=20
> Well, strictly speaking yes. But what I'll do later is make a
> 'uart_core' and then allow my MIPS platforms to only register the
> uart(s) they need.
>=20
> Right now it includes all of the uarts in sys/dev/uart/. They're not
> separate devices.
This must be a mips-specific thing, since on arm you only get what you =
ask for.
Warner
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Subject: Re: heads up - changing uart -> uart_ar71xx
From: Adrian Chadd <adrian@freebsd.org>
To: Warner Losh <imp@bsdimp.com>
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Are you absolutely sure? The code in sys/dev/uart/ seems to pull them
all in by default?
Adrian
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On Nov 16, 2012, at 11:05 AM, Adrian Chadd wrote:
> Are you absolutely sure? The code in sys/dev/uart/ seems to pull them
> all in by default?
I haven't checked recently, but it definitely used to be that way. It's =
one reason we made uart_class_8250 a weak reference at one point.
Warner
From owner-freebsd-mips@FreeBSD.ORG Sat Nov 17 08:29:18 2012
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From: "Rodney W. Grimes" <freebsd@pdx.rh.CN85.ChatUSA.com>
Message-Id: <201211170828.qAH8SP3g085130@pdx.rh.CN85.ChatUSA.com>
Subject: Re: heads up - changing uart -> uart_ar71xx
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To: Warner Losh <imp@bsdimp.com>
Date: Sat, 17 Nov 2012 00:28:25 -0800 (PST)
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Im having some confusion factor here .. perhaps its just caused by the wording
that is being used.
Why is there gona be something called ``uart_ar71xx''? As far as I know
there is a uart in the ar71xx, yes, but it isnt a uart specific to the ar71xx
family at all.
> On Nov 16, 2012, at 10:35 AM, Rodney W. Grimes wrote:
>
> > This should be cleaned up better than that, what -kind- of uart is it?
> > There should be things called
> > uart_8250 (should be able to drive everything from 8250 to 16950)
> > uart_8530 (this is probalby the second most common uart in the world)
> > uart_6850 (we would probably never see one of these)
> > etc...
> >
> > Please do not lock this to a specific Mips chip if at all possible
>
> uart already services a dozen of other UARTs. It isn't tied to MIPS at all.
Thats what I thought.
> All Adrian seems to be doing is making what was automatic configuration a
> little more manual.
I question the choice of labels to trigger that then....
> Warner
>
> >> Hi all,
> >>
> >> I've started digging into AR933x support and I've discovered that the
> >> UART is not an NS8250 style thing.
> >>
> >> So I'm going to shuffle the ar71xx uart code around to require both
^^^^^^^^^^^^^^^^^
What code is specific only to the ar71xx and has anything to do with a uart?
> >> 'uart' and 'uart_ar71xx'.
> >>
> >> I'll update the config files appropriately.
> >>
> >> Thanks!
> >>
> >>
> >>
> >> Adrian
> >> _______________________________________________
> >> freebsd-mips@freebsd.org mailing list
> >> http://lists.freebsd.org/mailman/listinfo/freebsd-mips
> >> To unsubscribe, send any mail to "freebsd-mips-unsubscribe@freebsd.org"
> >>
> >
> > --
> > Rod Grimes freebsd@freebsd.org
> > _______________________________________________
> > freebsd-mips@freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-mips
> > To unsubscribe, send any mail to "freebsd-mips-unsubscribe@freebsd.org"
>
>
>
--
Rod Grimes freebsd@freebsd.org
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Subject: Re: heads up - changing uart -> uart_ar71xx
From: Adrian Chadd <adrian@freebsd.org>
To: "Rodney W. Grimes" <freebsd@pdx.rh.cn85.chatusa.com>
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The glue code that sets up the ar71xx uart itself - there's some bus
glue in mips/atheros/.
adrian
On 17 November 2012 00:28, Rodney W. Grimes
<freebsd@pdx.rh.cn85.chatusa.com> wrote:
> Im having some confusion factor here .. perhaps its just caused by the wording
> that is being used.
>
> Why is there gona be something called ``uart_ar71xx''? As far as I know
> there is a uart in the ar71xx, yes, but it isnt a uart specific to the ar71xx
> family at all.
>> On Nov 16, 2012, at 10:35 AM, Rodney W. Grimes wrote:
>>
>> > This should be cleaned up better than that, what -kind- of uart is it?
>> > There should be things called
>> > uart_8250 (should be able to drive everything from 8250 to 16950)
>> > uart_8530 (this is probalby the second most common uart in the world)
>> > uart_6850 (we would probably never see one of these)
>> > etc...
>> >
>> > Please do not lock this to a specific Mips chip if at all possible
>>
>> uart already services a dozen of other UARTs. It isn't tied to MIPS at all.
> Thats what I thought.
>
>> All Adrian seems to be doing is making what was automatic configuration a
>> little more manual.
>
> I question the choice of labels to trigger that then....
>
>> Warner
>>
>> >> Hi all,
>> >>
>> >> I've started digging into AR933x support and I've discovered that the
>> >> UART is not an NS8250 style thing.
>> >>
>> >> So I'm going to shuffle the ar71xx uart code around to require both
> ^^^^^^^^^^^^^^^^^
>
> What code is specific only to the ar71xx and has anything to do with a uart?
>
>> >> 'uart' and 'uart_ar71xx'.
>> >>
>> >> I'll update the config files appropriately.
>> >>
>> >> Thanks!
>> >>
>> >>
>> >>
>> >> Adrian
>> >> _______________________________________________
>> >> freebsd-mips@freebsd.org mailing list
>> >> http://lists.freebsd.org/mailman/listinfo/freebsd-mips
>> >> To unsubscribe, send any mail to "freebsd-mips-unsubscribe@freebsd.org"
>> >>
>> >
>> > --
>> > Rod Grimes freebsd@freebsd.org
>> > _______________________________________________
>> > freebsd-mips@freebsd.org mailing list
>> > http://lists.freebsd.org/mailman/listinfo/freebsd-mips
>> > To unsubscribe, send any mail to "freebsd-mips-unsubscribe@freebsd.org"
>>
>>
>>
>
> --
> Rod Grimes freebsd@freebsd.org