From: Peter Zijlstra <peterz@infradead.org>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <frederic@kernel.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched/idle: disable tick in idle=poll idle entry
Date: Thu, 8 Jun 2023 10:34:00 +0200 [thread overview]
Message-ID: <20230608083400.GH998233@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <ZIEqlkIASx2F2DRF@tpad>
On Wed, Jun 07, 2023 at 10:10:46PM -0300, Marcelo Tosatti wrote:
>
> Commit a5183862e76fdc25f36b39c2489b816a5c66e2e5
> ("tick/nohz: Conditionally restart tick on idle exit") allows
> a nohz_full CPU to enter idle and return from it with the
> scheduler tick disabled (since the tick might be undesired noise).
>
> The idle=poll case still unconditionally restarts the tick when entering
> idle.
>
> To reduce the noise for that case as well, stop the tick when entering
> idle, for the idle=poll case.
>
> tick_nohz_idle_exit (called if the NEED_RESCHED bit is set)
> is responsible for re-enabling the tick when necessary.
Who cares and why?
next prev parent reply other threads:[~2023-06-08 8:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-08 1:10 [PATCH] sched/idle: disable tick in idle=poll idle entry Marcelo Tosatti
2023-06-08 8:34 ` Peter Zijlstra [this message]
2023-06-09 13:54 ` Marcelo Tosatti
2023-06-08 13:25 ` Frederic Weisbecker
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