From: Peter Zijlstra <peterz@infradead.org>
To: Chen Yu <yu.c.chen@intel.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
Tim Chen <tim.c.chen@intel.com>,
Mel Gorman <mgorman@techsingularity.net>,
Juri Lelli <juri.lelli@redhat.com>,
Rik van Riel <riel@surriel.com>, Aaron Lu <aaron.lu@intel.com>,
Abel Wu <wuyun.abel@bytedance.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Yicong Yang <yangyicong@hisilicon.com>,
"Gautham R . Shenoy" <gautham.shenoy@amd.com>,
Ingo Molnar <mingo@redhat.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Valentin Schneider <vschneid@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] sched/fair: Choose the CPU where short task is running during wake up
Date: Fri, 16 Sep 2022 13:45:00 +0200 [thread overview]
Message-ID: <YyRhvEGS4ivPGf+z@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20220915165407.1776363-1-yu.c.chen@intel.com>
On Fri, Sep 16, 2022 at 12:54:07AM +0800, Chen Yu wrote:
> And the rq lock bottleneck is composed of two paths(perf profile):
>
> (path1):
> raw_spin_rq_lock_nested.constprop.0;
> try_to_wake_up;
> default_wake_function;
> autoremove_wake_function;
> __wake_up_common;
> __wake_up_common_lock;
> __wake_up_sync_key;
> pipe_write;
> new_sync_write;
> vfs_write;
> ksys_write;
> __x64_sys_write;
> do_syscall_64;
> entry_SYSCALL_64_after_hwframe;write
Can you please addr2line -i the raw_spin_rq_lock callsite so we know which is
the one causing grief?
Specifically; I'm worried about PSI, psi_ttwu_dequeue() can cause ttwu()
to take _2_ rq->lock, which absolutely blows for this case.
next prev parent reply other threads:[~2022-09-16 11:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-15 16:54 Chen Yu
2022-09-15 17:10 ` Tim Chen
2022-09-16 10:49 ` Chen Yu
2022-09-16 11:45 ` Peter Zijlstra [this message]
2022-09-17 13:55 ` Chen Yu
2022-09-16 11:47 ` Peter Zijlstra
2022-09-17 14:15 ` Chen Yu
2022-09-26 5:50 ` K Prateek Nayak
2022-09-26 14:39 ` Gautham R. Shenoy
2022-09-29 16:58 ` K Prateek Nayak
2022-09-30 17:26 ` Chen Yu
2022-09-29 5:25 ` Chen Yu
2022-09-29 6:59 ` Honglei Wang
2022-09-29 17:34 ` K Prateek Nayak
2022-09-30 0:58 ` Honglei Wang
2022-09-30 16:03 ` Chen Yu
2022-09-29 17:19 ` K Prateek Nayak
2022-09-29 8:00 ` Vincent Guittot
2022-09-30 16:53 ` Chen Yu
2022-10-03 12:42 ` Vincent Guittot
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