linux-kernel - Re: [PATCH -mm -v3] mm, swap: Sort swap entries before free

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Message-ID: <1491570329.8850.163.camel@redhat.com>
Date:   Fri, 07 Apr 2017 09:05:29 -0400
From:   Rik van Riel <riel@...hat.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>,
        Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH -mm -v3] mm, swap: Sort swap entries before free

On Fri, 2017-04-07 at 14:49 +0800, Huang, Ying wrote:

> To solve the issue, the per-CPU buffer is sorted according to the
> swap
> device before freeing the swap entries.  Test shows that the time
> spent by swapcache_free_entries() could be reduced after the patch.
> 
> Test the patch via measuring the run time of
> swap_cache_free_entries()
> during the exit phase of the applications use much swap space.  The
> results shows that the average run time of swap_cache_free_entries()
> reduced about 20% after applying the patch.
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>
> Acked-by: Tim Chen <tim.c.chen@...el.com>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Shaohua Li <shli@...nel.org>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Rik van Riel <riel@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>