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From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>,
	mingo@kernel.org, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
	bristot@redhat.com, bsingharora@gmail.com, pbonzini@redhat.com,
	maz@kernel.org
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	peterz@infradead.org, riel@surriel.com, hannes@cmpxchg.org
Subject: Re: [PATCH 0/6] sched,delayacct: Some cleanups
Date: Fri, 07 May 2021 11:05:31 +0200	[thread overview]
Message-ID: <87zgx6ncbo.ffs@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20210505105940.190490250@infradead.org>

On Wed, May 05 2021 at 12:59, Peter Zijlstra wrote:
> Due to:
>
>   https://lkml.kernel.org/r/0000000000001d43ac05c0f5c6a0@google.com
>
> and general principle, delayacct really shouldn't be using ktime (pvclock also
> really shouldn't be doing what it does, but that's another story). This lead me
> to looking at the SCHED_INFO, SCHEDSTATS, DELAYACCT (and PSI) accounting hell.
>
> The rest of the patches are an attempt at simplifying all that a little. All
> that crud is enabled by default for distros which is leading to a death by a
> thousand cuts.
>
> The last patch is an attempt at default disabling DELAYACCT, because I don't
> think anybody actually uses that much, but what do I know, there were no ill
> effects on my testbox. Perhaps we should mirror
> /proc/sys/kernel/sched_schedstats and provide a delayacct sysctl for runtime
> frobbing.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

  parent reply	other threads:[~2021-05-07  9:05 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05 10:59 [PATCH 0/6] sched,delayacct: Some cleanups Peter Zijlstra
2021-05-05 10:59 ` [PATCH 1/6] delayacct: Use sched_clock() Peter Zijlstra
2021-05-05 14:40   ` Rik van Riel
2021-05-06 13:59   ` Johannes Weiner
2021-05-06 14:17     ` Peter Zijlstra
2021-05-06 15:17       ` Johannes Weiner
2021-05-07 12:40   ` Balbir Singh
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 10:43   ` [PATCH 1/6] " Mel Gorman
2021-05-05 10:59 ` [PATCH 2/6] sched: Rename sched_info_{queued,dequeued} Peter Zijlstra
2021-05-05 14:39   ` Rik van Riel
2021-05-06 13:59   ` Johannes Weiner
2021-05-10  8:45   ` Balbir Singh
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 10:49   ` [PATCH 2/6] " Mel Gorman
2021-05-05 10:59 ` [PATCH 3/6] sched: Simplify sched_info_on() Peter Zijlstra
2021-05-06 14:03   ` Johannes Weiner
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 11:10   ` [PATCH 3/6] " Mel Gorman
2021-05-12 11:32     ` Peter Zijlstra
2021-05-12 12:51       ` Mel Gorman
2021-05-05 10:59 ` [PATCH 4/6] kvm: Select SCHED_INFO instead of TASK_DELAY_ACCT Peter Zijlstra
2021-05-05 11:37   ` Paolo Bonzini
2021-05-06 14:38   ` Marc Zyngier
2021-05-07 12:42   ` Balbir Singh
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 11:11   ` [PATCH 4/6] " Mel Gorman
2021-05-05 10:59 ` [PATCH 5/6] delayacct: Add static_branch in scheduler hooks Peter Zijlstra
2021-05-06 14:05   ` Johannes Weiner
2021-05-10  8:42   ` Balbir Singh
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 11:13   ` [PATCH 5/6] " Mel Gorman
2021-05-05 10:59 ` [PATCH 6/6] [RFC] delayacct: Default disabled Peter Zijlstra
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 11:35   ` [PATCH 6/6] [RFC] " Mel Gorman
2021-05-05 22:29 ` [PATCH 0/6] sched,delayacct: Some cleanups Balbir Singh
2021-05-06  9:13   ` Peter Zijlstra
2021-05-07 12:38     ` Balbir Singh
2021-05-12 11:34       ` Mel Gorman
2021-05-12 11:38         ` Peter Zijlstra
2021-05-12 12:23         ` Paul Wise
2021-05-12 13:00           ` Mel Gorman
2021-05-13  1:29             ` Paul Wise
2021-06-25  0:50         ` Paul Wise
2021-05-07  9:05 ` Thomas Gleixner [this message]
2021-05-10  7:08 ` Ingo Molnar
2021-05-10 12:05 ` [PATCH 7/6] delayacct: Add sysctl to enable at runtime Peter Zijlstra
2021-05-10 12:06   ` Peter Zijlstra
2021-05-12 10:28   ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-05-12 11:40   ` [PATCH 7/6] " Mel Gorman
2021-05-19  8:09     ` [tip: sched/core] delayacct: Document task_delayacct sysctl tip-bot2 for Mel Gorman

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