From: Rik van Riel <riel@redhat.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Lee Schermerhorn <lee.schermerhorn@hp.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org
Subject: Re: [PATCH 3/8] mm: reuse_swap_page replaces can_share_swap_page
Date: Sun, 23 Nov 2008 17:43:14 -0500 [thread overview]
Message-ID: <4929DC82.4090103@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0811232156120.4142@blonde.site>
Hugh Dickins wrote:
> A good place to free up old swap is where do_wp_page(), or do_swap_page(),
> is about to redirty the page: the data on disk is then stale and won't be
> read again; and if we do decide to write the page out later, using the
> previous swap location makes an unnecessary disk seek very likely.
Better still, it frees up swap space that will never be read
anyway. This helps with workloads that push the system closer
to the edge and helps leave read-only pages on swap, avoiding
IO.
> Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2008-11-23 22:43 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-23 21:53 [PATCH 0/8] mm: from gup to vmscan Hugh Dickins
2008-11-23 21:55 ` [PATCH 1/8] mm: gup persist for write permission Hugh Dickins
2008-11-23 21:56 ` [PATCH 2/8] mm: wp lock page before deciding cow Hugh Dickins
2008-11-23 21:58 ` [PATCH 3/8] mm: reuse_swap_page replaces can_share_swap_page Hugh Dickins
2008-11-23 22:11 ` [PATCH] memcg: memswap controller core swapcache fixes Hugh Dickins
2008-11-24 5:43 ` KAMEZAWA Hiroyuki
2008-11-24 6:15 ` KAMEZAWA Hiroyuki
2008-11-24 12:29 ` Hugh Dickins
2008-11-24 12:57 ` KAMEZAWA Hiroyuki
2008-11-23 22:43 ` Rik van Riel [this message]
2008-11-23 22:00 ` [PATCH 4/8] mm: try_to_free_swap replaces remove_exclusive_swap_page Hugh Dickins
2008-11-23 22:01 ` [PATCH 5/8] mm: try_to_unuse check removing right swap Hugh Dickins
2008-11-23 22:03 ` [PATCH 6/8] mm: remove try_to_munlock from vmscan Hugh Dickins
2008-11-23 22:53 ` Rik van Riel
2008-11-24 17:34 ` Lee Schermerhorn
2008-11-24 19:29 ` Hugh Dickins
2008-12-01 20:16 ` Lee Schermerhorn
2008-12-02 0:51 ` Hugh Dickins
2008-11-23 22:05 ` [PATCH 7/8] mm: remove gfp_mask from add_to_swap Hugh Dickins
2008-11-23 22:07 ` [PATCH 8/8] mm: add add_to_swap stub Hugh Dickins
2008-11-23 22:55 ` Rik van Riel
2008-11-24 13:49 ` Hugh Dickins
2008-11-24 13:53 ` [PATCH 9/8] mm: optimize get_scan_ratio for no swap Hugh Dickins
2008-11-24 14:11 ` Rik van Riel
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