[RFC][PATCH 8/8] extends soft limit event filter

[KAMEZAWA Hiroyuki]

Reduce softlimit update ratio depends on its priority(usage).

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
 mm/memcontrol.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: mmotm-2.6.29-Mar23/mm/memcontrol.c
===================================================================
--- mmotm-2.6.29-Mar23.orig/mm/memcontrol.c
+++ mmotm-2.6.29-Mar23/mm/memcontrol.c
@@ -945,11 +945,15 @@ static bool mem_cgroup_soft_limit_check(
 	bool ret = false;
 	int cpu = get_cpu();
 	s64 val;
+	int thresh;
 	struct mem_cgroup_stat_cpu *cpustat;
 
 	cpustat = &mem->stat.cpustat[cpu];
 	val = __mem_cgroup_stat_read_local(cpustat, MEM_CGROUP_STAT_EVENTS);
-	if (unlikely(val > SOFTLIMIT_EVENTS_THRESH)) {
+	/* If usage is big, this check can be rough */
+	thresh = SOFTLIMIT_EVENTS_THRESH;
+	thresh <<= (mem->soft_limit_priority >> 1);
+	if (unlikely(val > thresh)) {
 		__mem_cgroup_stat_reset_safe(cpustat, MEM_CGROUP_STAT_EVENTS);
 		ret = true;
 	}

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