linux-kernel - Re: [PATCH 3/6] psi: eliminate lazy clock mode

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Message-ID: <20181217145754.GB2218@hirez.programming.kicks-ass.net>
Date:   Mon, 17 Dec 2018 15:57:54 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     gregkh@...uxfoundation.org, tj@...nel.org, lizefan@...wei.com,
        hannes@...xchg.org, axboe@...nel.dk, dennis@...nel.org,
        dennisszhou@...il.com, mingo@...hat.com, akpm@...ux-foundation.org,
        corbet@....net, cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [PATCH 3/6] psi: eliminate lazy clock mode

On Fri, Dec 14, 2018 at 09:15:05AM -0800, Suren Baghdasaryan wrote:
> Eliminate the idle mode and keep the worker doing 2s update intervals
> at all times.

That sounds like a bad deal.. esp. so for battery powered devices like
say Andoird.

In general the push has been to always idle everything, see NOHZ and
NOHZ_FULL and all the work that's being put into getting rid of any and
all period work.