From: Oleg Nesterov <oleg@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Fox <afox@redhat.com>,
Stephen Johnston <sjohnsto@redhat.com>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Stanislaw Gruszka <sgruszka@redhat.com>
Subject: Re: [PATCH] sched/cputime: make scale_stime() more precise
Date: Tue, 23 Jul 2019 16:29:18 +0200 [thread overview]
Message-ID: <20190723142918.GC8994@redhat.com> (raw)
In-Reply-To: <20190723140043.GB8994@redhat.com>
On 07/23, Oleg Nesterov wrote:
>
> > > Yes, statistically the numbers are proportionally divided.
> >
> > This; due to the loss in precision the distribution is like a step
> > function around the actual s:u ratio line, but on average it still is
> > s:u.
>
> You know, I am no longer sure... perhaps it is even worse, I need to recheck.
To clarify, this is probably true even if prev_cputime adds more confusion.
But how many minutes (hours? days?) you need to look at /proc/pid/stat
to get the average which more or less matches the reality?
Oleg.
next prev parent reply other threads:[~2019-07-23 14:29 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-18 13:18 [PATCH] sched/cputime: make scale_stime() more precise Oleg Nesterov
2019-07-18 13:21 ` Oleg Nesterov
2019-07-18 14:55 ` Oleg Nesterov
2019-07-19 11:03 ` Peter Zijlstra
2019-07-19 13:47 ` Peter Zijlstra
2019-07-19 14:37 ` Oleg Nesterov
2019-07-22 19:56 ` Peter Zijlstra
2019-07-23 14:00 ` Oleg Nesterov
2019-07-23 14:29 ` Oleg Nesterov [this message]
2019-07-19 14:03 ` Oleg Nesterov
2019-07-22 19:45 ` Peter Zijlstra
2019-07-22 10:52 ` Stanislaw Gruszka
2019-07-22 20:00 ` Peter Zijlstra
2019-07-23 9:37 ` Stanislaw Gruszka
2020-01-22 16:46 ` Oleg Nesterov
2020-01-23 13:05 ` Oleg Nesterov
2020-01-24 15:42 ` Oleg Nesterov
2020-01-27 12:28 ` [PATCH v2] " Oleg Nesterov
2020-05-15 17:24 ` Oleg Nesterov
2020-05-19 17:25 ` Peter Zijlstra
2020-05-19 18:33 ` Linus Torvalds
2020-05-19 18:42 ` Peter Zijlstra
2020-05-19 19:11 ` Peter Zijlstra
2020-05-19 19:51 ` Linus Torvalds
2020-05-20 15:24 ` Oleg Nesterov
2020-05-20 15:36 ` Peter Zijlstra
2020-05-20 20:10 ` Peter Zijlstra
2020-05-21 13:26 ` Oleg Nesterov
2020-06-16 12:21 ` [tip: sched/core] sched/cputime: Improve cputime_adjust() tip-bot2 for Oleg Nesterov
-- strict thread matches above, loose matches on Subject: below --
2019-07-18 13:15 [PATCH] sched/cputime: make scale_stime() more precise Oleg Nesterov
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