From: Con Kolivas <kernel@kolivas.org>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, Andrew Morton <akpm@osdl.org>, ck@vds.kolivas.org
Subject: [PATCH] mm: yield during swap prefetching
Date: Wed, 8 Mar 2006 10:13:44 +1100 [thread overview]
Message-ID: <200603081013.44678.kernel@kolivas.org> (raw)
Swap prefetching doesn't use very much cpu but spends a lot of time waiting on
disk in uninterruptible sleep. This means it won't get preempted often even at
a low nice level since it is seen as sleeping most of the time. We want to
minimise its cpu impact so yield where possible.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
---
mm/swap_prefetch.c | 1 +
1 file changed, 1 insertion(+)
Index: linux-2.6.15-ck5/mm/swap_prefetch.c
===================================================================
--- linux-2.6.15-ck5.orig/mm/swap_prefetch.c 2006-03-02 14:00:46.000000000 +1100
+++ linux-2.6.15-ck5/mm/swap_prefetch.c 2006-03-08 08:49:32.000000000 +1100
@@ -421,6 +421,7 @@ static enum trickle_return trickle_swap(
if (trickle_swap_cache_async(swp_entry, node) == TRICKLE_DELAY)
break;
+ yield();
}
if (sp_stat.prefetched_pages) {
--
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next reply other threads:[~2006-03-07 23:13 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-07 23:13 Con Kolivas [this message]
2006-03-07 23:26 ` Andrew Morton
2006-03-07 23:32 ` Con Kolivas
2006-03-08 0:05 ` Andrew Morton
2006-03-08 0:51 ` Con Kolivas
2006-03-08 1:11 ` Andrew Morton
2006-03-08 1:12 ` Con Kolivas
2006-03-08 1:19 ` Con Kolivas
2006-03-08 1:23 ` Andrew Morton
2006-03-08 1:28 ` Con Kolivas
2006-03-08 2:08 ` Lee Revell
2006-03-08 2:12 ` Con Kolivas
2006-03-08 2:18 ` Lee Revell
2006-03-08 2:22 ` Con Kolivas
2006-03-08 2:27 ` Lee Revell
2006-03-08 2:30 ` Con Kolivas
2006-03-08 2:52 ` [ck] " André Goddard Rosa
2006-03-08 3:03 ` Lee Revell
2006-03-08 3:05 ` Con Kolivas
2006-03-08 21:07 ` Zan Lynx
2006-03-08 23:00 ` Con Kolivas
2006-03-08 23:48 ` Zan Lynx
2006-03-09 0:07 ` Con Kolivas
2006-03-09 3:13 ` Zan Lynx
2006-03-09 4:08 ` Con Kolivas
2006-03-09 4:54 ` Lee Revell
2006-03-08 7:51 ` Jan Knutar
2006-03-08 8:39 ` Con Kolivas
2006-03-09 8:57 ` Helge Hafting
2006-03-09 9:08 ` Con Kolivas
2006-03-09 22:44 ` Peter Williams
2006-03-10 9:01 ` [ck] " Andreas Mohr
2006-03-10 9:11 ` Con Kolivas
2006-03-10 0:58 ` Peter Williams
2006-03-08 22:24 ` Pavel Machek
2006-03-09 2:22 ` Nick Piggin
2006-03-09 2:30 ` Con Kolivas
2006-03-09 2:57 ` Nick Piggin
2006-03-09 9:11 ` Con Kolivas
2006-03-08 13:36 ` [ck] " Con Kolivas
2006-03-17 9:06 ` Ingo Molnar
2006-03-08 8:48 ` Andreas Mohr
2006-03-08 8:52 ` Con Kolivas
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