linux-kernel - Re: [PATCH v3] mm/page_alloc: bail out on fatal signal during reclaim/compaction retry attempt

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Message-ID: <YKZDdJb05ZHhZesn@casper.infradead.org>
Date:   Thu, 20 May 2021 12:09:40 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Aaron Tomlin <atomlin@...hat.com>, linux-mm@...ck.org,
        vbabka@...e.cz, mhocko@...e.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm/page_alloc: bail out on fatal signal during
 reclaim/compaction retry attempt

On Wed, May 19, 2021 at 09:34:55PM -0700, Andrew Morton wrote:
> On Wed, 19 May 2021 21:17:43 +0100 Aaron Tomlin <atomlin@...hat.com> wrote:
> 
> > It does not make sense to retry compaction when a fatal signal is
> > pending.
> 
> Well, it might make sense.  Presumably it is beneficial to other tasks.

Apart from Vlastimil's point, if I hit ^C, I want the task to die,
as soon as possible.  I don't want it to do things which are beneficial
to other tasks, I want my shell prompt back, not spending seconds
trying to compact memory.  Some other task can do that if _it_ needs
large contiguous chunks.