From: Rik van Riel <riel@redhat.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Mel Gorman <mgorman@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>, Hugh Dickins <hughd@google.com>
Subject: Re: [RFC 4/4] mm: free reclaimed pages instantly without depending next reclaim
Date: Tue, 14 May 2013 13:32:33 -0400 [thread overview]
Message-ID: <51927531.8010507@redhat.com> (raw)
In-Reply-To: <1368411048-3753-5-git-send-email-minchan@kernel.org>
On 05/12/2013 10:10 PM, Minchan Kim wrote:
> Normally, file I/O for reclaiming is asynchronous so that
> when page writeback is completed, reclaimed page will be
> rotated into LRU tail for fast reclaiming in next turn.
> But it makes unnecessary CPU overhead and more iteration with higher
> priority of reclaim could reclaim too many pages than needed
> pages.
>
> This patch frees reclaimed pages by paging out instantly without
> rotating back them into LRU's tail when the I/O is completed so
> that we can get out of reclaim loop as soon as poosbile and avoid
> unnecessary CPU overhead for moving them.
>
> Signed-off-by: Minchan Kim <minchan@kernel.org>
I like this approach and am looking forward to your v2 series,
with the reworked patch 3/4.
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next prev parent reply other threads:[~2013-05-14 17:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-13 2:10 [RFC 0/4] free reclaimed pages by paging out instantly Minchan Kim
2013-05-13 2:10 ` [RFC 1/4] mm: Don't hide spin_lock in swap_info_get Minchan Kim
2013-05-13 2:10 ` [RFC 2/4] mm: introduce __swapcache_free Minchan Kim
2013-05-13 2:10 ` [RFC 3/4] mm: support remove_mapping in irqcontext Minchan Kim
2013-05-13 14:58 ` Michal Hocko
2013-05-14 7:17 ` Minchan Kim
2013-05-13 2:10 ` [RFC 4/4] mm: free reclaimed pages instantly without depending next reclaim Minchan Kim
2013-05-14 17:32 ` Rik van Riel [this message]
2013-05-15 7:12 ` Minchan Kim
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