lkml.org 
[lkml]   [2006]   [Mar]   [7]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
FromCon Kolivas <>
Subject[PATCH] mm: yield during swap prefetching
DateWed, 8 Mar 2006 10:13:44 +1100
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) {
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-03-07 23:15    [from the cache]
©2003-2008