From: Shaohua Li <shaohua.li@intel.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Linux-MM <linux-mm@kvack.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>, Jan Kara <jack@suse.cz>,
Andy Isaacson <adi@hexapodia.org>,
Johannes Weiner <jweiner@redhat.com>,
Rik van Riel <riel@redhat.com>, Nai Xia <nai.xia@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 7/7] mm: compaction: Introduce sync-light migration for use by compaction
Date: Tue, 22 Nov 2011 14:56:51 +0800 [thread overview]
Message-ID: <1321945011.22361.335.camel@sli10-conroe> (raw)
In-Reply-To: <1321900608-27687-8-git-send-email-mgorman@suse.de>
On Tue, 2011-11-22 at 02:36 +0800, Mel Gorman wrote:
> This patch adds a lightweight sync migrate operation MIGRATE_SYNC_LIGHT
> mode that avoids writing back pages to backing storage. Async
> compaction maps to MIGRATE_ASYNC while sync compaction maps to
> MIGRATE_SYNC_LIGHT. For other migrate_pages users such as memory
> hotplug, MIGRATE_SYNC is used.
>
> This avoids sync compaction stalling for an excessive length of time,
> particularly when copying files to a USB stick where there might be
> a large number of dirty pages backed by a filesystem that does not
> support ->writepages.
Hi,
from my understanding, with this, even writes
to /proc/sys/vm/compact_memory doesn't wait for pageout, is this
intended?
on the other hand, MIGRATE_SYNC_LIGHT now waits for pagelock and buffer
lock, so could wait on page read. page read and page out have the same
latency, why takes them different?
Thanks,
Shaohua
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next prev parent reply other threads:[~2011-11-22 6:46 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 18:36 [RFC PATCH 0/7] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v4r2 Mel Gorman
2011-11-21 18:36 ` [PATCH 1/7] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman
2011-11-22 16:58 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 2/7] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Mel Gorman
2011-11-22 17:00 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 3/7] mm: check if we isolated a compound page during lumpy scan Mel Gorman
2011-11-22 17:05 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 4/7] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman
2011-11-21 18:36 ` [PATCH 5/7] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman
2011-11-22 17:30 ` Minchan Kim
2011-11-23 9:19 ` Mel Gorman
2011-11-21 18:36 ` [PATCH 6/7] mm: page allocator: Limit when direct reclaim is used when compaction is deferred Mel Gorman
2011-11-22 17:50 ` Minchan Kim
2011-11-21 18:36 ` [PATCH 7/7] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman
2011-11-22 6:56 ` Shaohua Li [this message]
2011-11-22 10:14 ` Mel Gorman
2011-11-22 11:54 ` Jan Kara
2011-11-22 13:59 ` Nai Xia
2011-11-22 15:07 ` Nai Xia
2011-11-22 19:13 ` Jan Kara
2011-11-22 22:44 ` Nai Xia
2011-11-23 11:39 ` Jan Kara
2011-11-23 12:20 ` Nai Xia
2011-11-23 2:01 ` Nai Xia
2011-11-23 2:25 ` Shaohua Li
2011-11-23 11:00 ` Mel Gorman
2011-11-23 12:51 ` Nai Xia
2011-11-23 13:05 ` Nai Xia
2011-11-23 13:45 ` Mel Gorman
2011-11-23 14:35 ` Nai Xia
2011-11-23 15:08 ` Mel Gorman
2011-11-23 15:23 ` Nai Xia
2011-11-23 15:57 ` Mel Gorman
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