From: Minchan Kim <minchan@kernel.org>
To: Shaohua Li <shli@kernel.org>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org, mgorman@suse.de,
aarcange@redhat.com
Subject: Re: [patch 2/2 v2]compaction: check lock contention first before taking lock
Date: Tue, 11 Sep 2012 10:58:10 +0900 [thread overview]
Message-ID: <20120911015810.GB14331@bbox> (raw)
In-Reply-To: <20120910011850.GD3715@kernel.org>
On Mon, Sep 10, 2012 at 09:18:50AM +0800, Shaohua Li wrote:
> isolate_migratepages_range will take zone->lru_lock first and check if the lock
> is contented, if yes, it will release the lock. This isn't efficient. If the
> lock is truly contented, a lock/unlock pair will increase the lock contention.
> We'd better check if the lock is contended first. compact_trylock_irqsave
> perfectly meets the requirement.
>
> V2:
> leave cond_resched() pointed out by Mel.
>
> Signed-off-by: Shaohua Li <shli@fusionio.com>
Acked-by: Minchan Kim <minchan@kernel.org>
--
Kind regards,
Minchan Kim
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next prev parent reply other threads:[~2012-09-11 1:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-10 1:18 [patch 2/2 v2]compaction: check lock contention first before taking lock Shaohua Li
2012-09-10 8:12 ` Mel Gorman
2012-09-11 1:58 ` Minchan Kim [this message]
2012-09-11 23:43 ` Andrew Morton
2012-09-12 10:55 ` Mel Gorman
2012-09-12 21:59 ` Andrew Morton
2012-09-13 8:19 ` Mel Gorman
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