Date: Wed, 14 Apr 2021 18:10:15 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Mark Johnston <markj@freebsd.org> Cc: freebsd-stable List <stable@freebsd.org>, FreeBSD Current <current@freebsd.org> Subject: Re: stable/13, vm page counts do not add up Message-ID: <9b1aa260-f54a-dc7a-bf19-1d83a49a01ac@FreeBSD.org> In-Reply-To: <YHbu8ApV7KfXEU%2By@nuc> References: <0606571f-fec0-c7ad-98e8-a0b8554918e2@FreeBSD.org> <YG4OAVa0ohh4illU@nuc> <f509bf54-e283-eb29-2db2-1457dae7bc13@FreeBSD.org> <YG4ckaRbub6kEFO8@nuc> <dd0a979f-8a50-ab28-9701-0a8cddc9471b@FreeBSD.org> <YHYKsl/sNBNYZUDC@nuc> <23d370fa-41db-a89b-03fd-e45deb874aed@FreeBSD.org> <YHbu8ApV7KfXEU%2By@nuc>
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On 14/04/2021 16:32, Mark Johnston wrote:
> On Wed, Apr 14, 2021 at 02:21:44PM +0300, Andriy Gapon wrote:
>> On 14/04/2021 00:18, Mark Johnston wrote:
>>> fbt::vm_page_unwire:entry
>>> /args[0]->oflags & 0x4/
>>> {
>>> @unwire[stack()] = count();
>>> }
>>
>> Unrelated report, dtrace complains about this probe on my stable/13 system:
>> failed to resolve translated type for args[0]
>>
>> And I do not have any idea why...
>
> There was a regression, see PR 253440. I think you have the fix
> already, but perhaps not. Could you show output from
> "dtrace -lv -n fbt::vm_page_unwire:entry"?
dtrace -lv -n fbt::vm_page_unwire:entry
ID PROVIDER MODULE FUNCTION NAME
54323 fbt kernel vm_page_unwire entry
Probe Description Attributes
Identifier Names: Private
Data Semantics: Private
Dependency Class: Unknown
Argument Attributes
Identifier Names: Private
Data Semantics: Private
Dependency Class: ISA
Argument Types
args[0]: (unknown)
args[1]: (unknown)
It seems that I should have the fix, but somehow I still have the problem.
I've been doing NO_CLEAN builds for a long while, so maybe some stale file
didn't get re-created...
It looks that dt_lex.c under /usr/obj is rather dated.
... I've removed that file and rebuilt libdtrace and everything is okay now.
Thank you.
>> From ctfdump:
>> [27290] FUNC (vm_page_unwire) returns: 38 args: (1463, 3)
>>
>> <1463> TYPEDEF vm_page_t refers to 778
>> <778> POINTER (anon) refers to 3575
>> <3575> STRUCT vm_page (104 bytes)
>> plinks type=3563 off=0
>> listq type=3558 off=128
>> object type=3564 off=256
>> pindex type=3565 off=320
>> phys_addr type=42 off=384
>> md type=3571 off=448
>> ref_count type=31 off=640
>> busy_lock type=31 off=672
>> a type=3573 off=704
>> order type=3 off=736
>> pool type=3 off=744
>> flags type=3 off=752
>> oflags type=3 off=760
>> psind type=2167 off=768
>> segind type=2167 off=776
>> valid type=3574 off=784
>> dirty type=3574 off=792
>>
>> --
>> Andriy Gapon
--
Andriy Gapon
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