Date: Sat, 27 Jan 2018 09:41:28 -0800 From: Mark Millard <marklmi26-fbsd@yahoo.com> To: Don Lewis <truckman@FreeBSD.org>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: Ryzen issues on FreeBSD ? Message-ID: <0641905F-6D9D-4157-9DCC-88A2EBCBB720@yahoo.com>
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Don Lewis truckman at FreeBSD.org wrote on
Sat Jan 27 08:23:27 UTC 2018 :
> PID TID COMM TDNAME CPU PRI STATE =
WCHAN =20
> 90692 100801 python2.7 - -1 124 sleep =
usem =20
> 90692 100824 python2.7 - -1 124 sleep =
usem =20
. . .
# grep -r '"usem"' /usr/src/sys/
/usr/src/sys/dev/qlnx/qlnxe/ecore_dbg_fw_funcs.c: "usem", { true, =
true, true }, true, DBG_USTORM_ID,
/usr/src/sys/kern/kern_umtx.c: error =3D umtxq_sleep(uq, "usem", =
timeout =3D=3D NULL ? NULL : &timo);
/usr/src/sys/kern/kern_umtx.c: error =3D umtxq_sleep(uq, "usem", =
timeout =3D=3D NULL ? NULL : &timo);
/usr/src/sys/kern/kern_umtx.c has :
#if defined(COMPAT_FREEBSD9) || defined(COMPAT_FREEBSD10)
static int
do_sem_wait(struct thread *td, struct _usem *sem, struct _umtx_time =
*timeout)
{
. . .
error =3D umtxq_sleep(uq, "usem", timeout =3D=3D NULL ? NULL : =
&timo);
. . .
#endif
. . .
static int
do_sem2_wait(struct thread *td, struct _usem2 *sem, struct _umtx_time =
*timeout)
{
. . .
error =3D umtxq_sleep(uq, "usem", timeout =3D=3D NULL ? NULL : =
&timo);
. . .
The comparison/contrast for:
> 90692 101629 python2.7 - -1 125 sleep =
umtxn =20
# grep -r '"umtxn"' /usr/src/sys/
/usr/src/sys/kern/kern_umtx.c: error =3D =
umtxq_sleep(uq, "umtxn", timeout =3D=3D NULL ?
/usr/src/sys/kern/kern_umtx.c has:
static int
do_lock_normal(struct thread *td, struct umutex *m, uint32_t flags,
struct _umtx_time *timeout, int mode)
{
. . .
/*
* We set the contested bit, sleep. Otherwise the lock =
changed
* and we need to retry or we lost a race to the thread
* unlocking the umtx.
*/
umtxq_lock(&uq->uq_key);
umtxq_unbusy(&uq->uq_key);
if (old =3D=3D owner)
error =3D umtxq_sleep(uq, "umtxn", timeout =3D=3D =
NULL ?
NULL : &timo);
umtxq_remove(uq);
umtxq_unlock(&uq->uq_key);
umtx_key_release(&uq->uq_key);
. . .
Both contexts are umtxq_sleep usage:
/*
* Put thread into sleep state, before sleeping, check if
* thread was removed from umtx queue.
*/
static inline int
umtxq_sleep(struct umtx_q *uq, const char *wmesg, struct abs_timeout =
*abstime)
. . .
Note: I'm guessing that /usr/src/sys/dev/qlnx/qlnxe/ecore_dbg_fw_funcs.c
is not involved.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( markmi at dsl-only.net is
going away in 2018-Feb, late)
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