From: Alexey Dobriyan <adobriyan@gmail.com>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Wei Li <liwei391@huawei.com>,
Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>,
Yu Liao <liaoyu15@huawei.com>, Hillf Danton <hdanton@sina.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH 7/7] selftests/proc: Remove idle time monotonicity assertions
Date: Mon, 20 Feb 2023 23:16:15 +0300 [thread overview]
Message-ID: <Y/PVD58nzv8gDhFL@p183> (raw)
In-Reply-To: <20230220124129.519477-8-frederic@kernel.org>
On Mon, Feb 20, 2023 at 01:41:29PM +0100, Frederic Weisbecker wrote:
> Due to broken iowait task counting design (cf: comments above
> get_cpu_idle_time_us() and nr_iowait()), it is not possible to provide
> the guarantee that /proc/stat or /proc/uptime display monotonic idle
> time values.
Those test uptime _and_ idle time? You aren't sacking uptime, right?
> delete mode 100644 tools/testing/selftests/proc/proc-uptime-001.c
> delete mode 100644 tools/testing/selftests/proc/proc-uptime-002.c
next prev parent reply other threads:[~2023-02-20 20:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-20 12:41 [PATCH 0/7] timers/nohz: Fixes and cleanups v2 Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 1/7] timers/nohz: Restructure and reshuffle struct tick_sched Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 2/7] timers/nohz: Only ever update sleeptime from idle exit Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 3/7] timers/nohz: Protect idle/iowait sleep time under seqcount Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 4/7] timers/nohz: Add a comment about broken iowait counter update race Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 5/7] timers/nohz: Remove middle-function __tick_nohz_idle_stop_tick() Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 6/7] MAINTAINERS: Remove stale email address Frederic Weisbecker
2023-02-20 12:41 ` [PATCH 7/7] selftests/proc: Remove idle time monotonicity assertions Frederic Weisbecker
2023-02-20 20:16 ` Alexey Dobriyan [this message]
2023-02-20 21:53 ` Thomas Gleixner
2023-02-22 14:48 ` Frederic Weisbecker
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