From: Peter Zijlstra <peterz@infradead.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Balbir Singh <bsingharora@gmail.com>,
tglx@linutronix.de, mingo@kernel.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com,
pbonzini@redhat.com, maz@kernel.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
riel@surriel.com, hannes@cmpxchg.org,
Paul Wise <pabs3@bonedaddy.net>
Subject: Re: [PATCH 0/6] sched,delayacct: Some cleanups
Date: Wed, 12 May 2021 13:38:00 +0200 [thread overview]
Message-ID: <YJu+GPHYmRf5Y/Br@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210512113419.GF3672@suse.de>
On Wed, May 12, 2021 at 12:34:19PM +0100, Mel Gorman wrote:
> > I don't disagree, we've had these around for a while and I know of users
> > that use these stats to find potential starvation. I am OK with default
> > disabled. I suspect distros will have the final say.
> >
>
> I think default disabled should be fine. At worst when dealing with a bug
> there would be a need to either reboot or enable at runtime with patch
> 7 included and add that instruction to the bug report when requesting
> iotop data. At worst, a distro could revert the patch if iotop generated
> too many bug reports or patch iotop in the distro package.
>
> Alternatively, I've added Paul Wise to the cc who is the latest
> committer to iotop. Maybe he knows who could add/commit a check for
> sysctl.sched_delayacct and if it exists then check if it's 1 and display
> an error suggesting corrective action (add delayacct to the kernel command
> line or sysctl sched.sched_delayacct=1). iotop appears to be in maintenance
> mode but gets occasional commits even if it has not had a new version
> since 2013 so maybe it could get a 0.7 tag if such a check was added.
In the final commit I made the knob be known as task_delayacct. I
figured that was a slightly better name.
But yes, a check in iotop, if that really is the sole user of all this,
would be very nice.
Thanks!
next prev parent reply other threads:[~2021-05-12 11:40 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 [this message]
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
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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