linux-kernel - Re: [PATCH] psi: Fix trigger being fired unexpectedly at initial

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Date:   Wed, 6 Apr 2022 13:11:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Hailong Liu <liuhailong@...ux.alibaba.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        aniel Bristot de Oliveira <bristot@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] psi: Fix trigger being fired unexpectedly at initial

On Fri, Apr 01, 2022 at 09:19:17AM -0700, Suren Baghdasaryan wrote:
> On Thu, Mar 31, 2022 at 10:10 PM Hailong Liu
> <liuhailong@...ux.alibaba.com> wrote:
> >
> > When a trigger being created, its win.start_value and win.start_time are
> > reset to zero. If group->total[PSI_POLL][t->state] has accumulated before,
> > this trigger will be fired unexpectedly in the next period, even if its
> > growth time does not reach its threshold.
> >
> > So set the window of the new trigger to the current state value.
> 
> Makes sense to me. Thanks!
> 
> >
> > Signed-off-by: Hailong Liu <liuhailong@...ux.alibaba.com>
> 
> Acked-by: Suren Baghdasaryan <surenb@...gle.com>

Thanks!