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Groups > linux.kernel > #1722589
| From | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit |
| Date | 2017-08-29 18:10 +0200 |
| Message-ID | <ujRfs-4Ns-21@gated-at.bofh.it> (permalink) |
| References | (7 earlier) <uizuh-3Wv-1@gated-at.bofh.it> <uiNQB-4z5-1@gated-at.bofh.it> <ujtGa-6PN-9@gated-at.bofh.it> <ujvoD-7Xb-33@gated-at.bofh.it> <ujOhC-2Kk-39@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Aug 29, 2017 at 5:57 AM, Liang, Kan <kan.liang@intel.com> wrote:
>>
>> Attached is an ALMOST COMPLETELY UNTESTED forward-port of those two
>> patches, now without that nasty WQ_FLAG_ARRIVALS logic, because we now
>> always put the new entries at the end of the waitqueue.
>
> The patches fix the long wait issue.
>
> Tested-by: Kan Liang <kan.liang@intel.com>
Ok. I'm not 100% comfortable applying them at rc7, so let me think
about it. There's only one known load triggering this, and by "known"
I mean "not really known" since we don't even know what the heck it
does outside of intel and whoever your customer is.
So I suspect I'll apply the patches next merge window, and we can
maybe mark them for stable if this actually ends up mattering.
Can you tell if the problem is actually hitting _production_ use or
was some kind of benchmark stress-test?
Linus
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[PATCH 1/2 v2] sched/wait: Break up long wake list walk Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-25 18:40 +0200
[PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-25 18:40 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-25 22:00 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-26 00:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-26 01:10 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-26 02:40 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-26 05:00 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-26 20:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-27 23:50 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-27 23:50 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-28 01:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Nicholas Piggin <npiggin@gmail.com> - 2017-08-28 03:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Nicholas Piggin <npiggin@gmail.com> - 2017-08-28 03:40 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-28 07:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Nicholas Piggin <npiggin@gmail.com> - 2017-08-28 09:20 +0200
RE: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit "Liang, Kan" <kan.liang@intel.com> - 2017-08-28 17:00 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-28 18:50 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-28 22:10 +0200
RE: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit "Liang, Kan" <kan.liang@intel.com> - 2017-08-29 15:00 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-29 18:10 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-29 18:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-29 18:30 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-29 19:00 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Tim Chen <tim.c.chen@linux.intel.com> - 2017-08-29 18:20 +0200
Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit Linus Torvalds <torvalds@linux-foundation.org> - 2017-08-29 18:30 +0200
Re: [PATCH 1/2 v2] sched/wait: Break up long wake list walk Christopher Lameter <cl@linux.com> - 2017-08-25 19:50 +0200
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