[patch 22/23] dynticks: increase SLAB timeouts

[Thomas Gleixner]

From: Ingo Molnar <mingo@xxxxxxx>

decrease the rate of SLAB timers going off. Reduces the amount
of timers going off in an idle system.

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
--
 mm/slab.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6.18-mm2/mm/slab.c
===================================================================
--- linux-2.6.18-mm2.orig/mm/slab.c	2006-09-30 01:41:09.000000000 +0200
+++ linux-2.6.18-mm2/mm/slab.c	2006-09-30 01:41:20.000000000 +0200
@@ -457,8 +457,13 @@ struct kmem_cache {
  * OTOH the cpuarrays can contain lots of objects,
  * which could lock up otherwise freeable slabs.
  */
-#define REAPTIMEOUT_CPUC	(2*HZ)
-#define REAPTIMEOUT_LIST3	(4*HZ)
+#ifdef CONFIG_NO_HZ
+# define REAPTIMEOUT_CPUC	(4*HZ)
+# define REAPTIMEOUT_LIST3	(8*HZ)
+#else
+# define REAPTIMEOUT_CPUC	(2*HZ)
+# define REAPTIMEOUT_LIST3	(4*HZ)
+#endif
 
 #if STATS
 #define	STATS_INC_ACTIVE(x)	((x)->num_active++)

--

-
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