From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Richard Davies <richard@arachsys.com>, KVM <kvm@vger.kernel.org>,
QEMU-devel <qemu-devel@nongnu.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>, Avi Kivity <avi@redhat.com>,
Shaohua Li <shli@kernel.org>
Subject: Re: [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock as late as possible
Date: Thu, 20 Sep 2012 14:54:33 -0400 [thread overview]
Message-ID: <505B6669.2040104@redhat.com> (raw)
In-Reply-To: <1348149875-29678-4-git-send-email-mgorman@suse.de>
On 09/20/2012 10:04 AM, Mel Gorman wrote:
> Compactions free scanner acquires the zone->lock when checking for PageBuddy
> pages and isolating them. It does this even if there are no PageBuddy pages
> in the range.
>
> This patch defers acquiring the zone lock for as long as possible. In the
> event there are no free pages in the pageblock then the lock will not be
> acquired at all which reduces contention on zone->lock.
>
> Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
next prev parent reply other threads:[~2012-09-20 18:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 14:04 [Qemu-devel] [PATCH 0/6] Reduce compaction scanning and lock contention Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] [PATCH 1/6] mm: compaction: Abort compaction loop if lock is contended or run too long Mel Gorman
2012-09-20 18:53 ` Rik van Riel
2012-09-20 14:04 ` [Qemu-devel] [PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as late as possible Mel Gorman
2012-09-20 18:54 ` Rik van Riel
2012-09-20 14:04 ` [Qemu-devel] [PATCH 3/6] mm: compaction: Acquire the zone->lock " Mel Gorman
2012-09-20 18:54 ` Rik van Riel [this message]
2012-09-20 14:04 ` [Qemu-devel] [PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left" Mel Gorman
2012-09-20 18:54 ` Rik van Riel
2012-09-20 14:04 ` [Qemu-devel] [PATCH 5/6] mm: compaction: Cache if a pageblock was scanned and no pages were isolated Mel Gorman
2012-09-20 18:55 ` Rik van Riel
2012-09-20 14:04 ` [Qemu-devel] [PATCH 6/6] mm: compaction: Restart compaction from near where it left off Mel Gorman
2012-09-20 18:57 ` Rik van Riel
2012-09-21 9:13 ` [Qemu-devel] [PATCH 0/6] Reduce compaction scanning and lock contention Richard Davies
2012-09-21 9:15 ` Richard Davies
2012-09-21 9:17 ` Richard Davies
2012-09-21 9:55 ` Mel Gorman
2012-09-21 9:18 ` Richard Davies
2012-09-21 9:35 ` Mel Gorman
2012-09-21 9:49 ` Richard Davies
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