linux-kernel - Re: [PATCH 1/2] sched/wait: Break up long wake list walk

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Message-ID: <CA+55aFxC0wa=TjpfVQ8-iQEzrg0pwsTNxGZCT_JSZJFTR0GKkw@mail.gmail.com>
Date:   Tue, 22 Aug 2017 11:25:52 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched/wait: Break up long wake list walk

On Tue, Aug 22, 2017 at 11:19 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So I propose testing the attached trivial patch. It may not do
> anything at all. But the existing code is actually doing extra work
> just to be fragile, in case the scenario above can happen.

Side note: the patch compiles for me. But that is literally ALL the
testing it has gotten. I spent more time writing that email trying to
explain what my thinking was about that patch, than I spent anywhere
else on that patch.

So it may be garbage. Caveat probator.

              Linus