linux-kernel - Re: [PATCH v2] mm, compaction: properly signal and act upon lock and need

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Message-ID: <CAOMZO5BKaicq7NkoJO4vU5W3hiDike6kSdH+2eD=h0B5BsDjTg@mail.gmail.com>
Date:	Mon, 2 Jun 2014 10:35:15 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Shawn Guo <shawn.guo@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Minchan Kim <minchan@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Hugh Dickins <hughd@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Olof Johansson <olof@...om.net>,
	Greg Thelen <gthelen@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Christoph Lameter <cl@...ux.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] mm, compaction: properly signal and act upon lock and
 need_sched() contention

Vlastimil,

On Fri, May 23, 2014 at 5:34 AM, Vlastimil Babka <vbabka@...e.cz> wrote:

> Really sorry, guys :/
>
> -----8<-----
> From: Vlastimil Babka <vbabka@...e.cz>
> Date: Fri, 23 May 2014 10:18:56 +0200
> Subject: mm-compaction-properly-signal-and-act-upon-lock-and-need_sched-contention-fix2
>
> Step 1: Change function name and comment between v1 and v2 so that the return
>         value signals the opposite thing.
> Step 2: Change the call sites to reflect the opposite return value.
> Step 3: ???
> Step 4: Make a complete fool of yourself.
>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
>  mm/compaction.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index a525cd4..5175019 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -237,13 +237,13 @@ static inline bool compact_should_abort(struct compact_control *cc)
>         if (need_resched()) {
>                 if (cc->mode == MIGRATE_ASYNC) {
>                         cc->contended = true;
> -                       return false;
> +                       return true;
>                 }
>
>                 cond_resched();
>         }
>
> -       return true;
> +       return false;
>  }

This patch is still not in linux-next.

Could you please submit it formally?
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