From: Peter Zijlstra <peterz@infradead.org>
To: xunlei <xunlei.pang@gmail.com>
Cc: Xunlei Pang <xlpang@linux.alibaba.com>,
Ingo Molnar <mingo@redhat.com>,
Frederic Weisbecker <frederic@kernel.org>,
Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched/cputime: Ensure correct utime and stime proportion
Date: Mon, 9 Jul 2018 12:47:59 +0200 [thread overview]
Message-ID: <20180709104759.GJ2476@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <da032f2b-61e0-bd12-f0ec-0ef21b87d3d7@gmail.com>
On Thu, Jul 05, 2018 at 09:58:50PM +0800, xunlei wrote:
> It is rtime < utime + stime, that is the imprecise tick-based run time
> may be larger than precise sum_exec_runtime scheduler-based run time, it
> can happen with some frequent run-sleep patterns.
You're still comparing two values that should not be compared. utime +
stime is not a run-time. You _CANNOT_ compare to rtime and doing so
means you're still not getting it.
next prev parent reply other threads:[~2018-07-09 10:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-22 7:15 [PATCH] sched/cputime: Ensure correct utime and stime proportion Xunlei Pang
2018-06-22 10:35 ` kbuild test robot
2018-06-25 8:14 ` Xunlei Pang
2018-06-26 12:19 ` Xunlei Pang
2018-06-26 15:49 ` Peter Zijlstra
2018-06-27 12:22 ` Xunlei Pang
2018-07-05 10:46 ` Peter Zijlstra
2018-07-05 13:21 ` Xunlei Pang
2018-07-05 13:42 ` Peter Zijlstra
2018-07-05 13:58 ` xunlei
2018-07-09 10:47 ` Peter Zijlstra [this message]
2018-07-09 5:52 ` Xunlei Pang
2018-07-09 10:48 ` Peter Zijlstra
2018-07-09 15:00 ` Xunlei Pang
2018-07-02 15:21 ` Tejun Heo
2018-07-04 6:56 ` Xunlei Pang
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