From: Con Kolivas <kernel@kolivas.org>
To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org
Subject: [PATCH] swap prefetch: avoid repeating entry
Date: Wed, 7 Mar 2007 18:14:04 +1100 [thread overview]
Message-ID: <200703071814.04531.kernel@kolivas.org> (raw)
I've been unable for 4 months to find someone to test this Andrew. I'm going
to assume it fixes the problem on numa=64 (or something like that) so please
apply it.
---
Avoid entering trickle_swap() when first initialising kprefetchd to prevent
endless loops.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
---
mm/swap_prefetch.c | 4 ++++
1 file changed, 4 insertions(+)
Index: linux-2.6.21-rc2-mm2/mm/swap_prefetch.c
===================================================================
--- linux-2.6.21-rc2-mm2.orig/mm/swap_prefetch.c 2007-03-06 22:23:26.000000000 +1100
+++ linux-2.6.21-rc2-mm2/mm/swap_prefetch.c 2007-03-07 18:11:50.000000000 +1100
@@ -515,6 +515,10 @@ static int kprefetchd(void *__unused)
/* Set ioprio to lowest if supported by i/o scheduler */
sys_ioprio_set(IOPRIO_WHO_PROCESS, 0, IOPRIO_CLASS_IDLE);
+ /* kprefetchd has nothing to do until it is woken up the first time */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+
do {
try_to_freeze();
--
-ck
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next reply other threads:[~2007-03-07 7:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-07 7:14 Con Kolivas [this message]
2007-03-07 7:26 ` [PATCH] swap prefetch: avoid repeating entry Andrew Morton
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