[PATCH] mm, vmstat: Use cond_resched only when !CONFIG_PREEMPT

[Rakib Mullick]

commit 468fd62ed9 (vmstats: add cond_resched() to refresh_cpu_vm_stats()) added cond_resched() in refresh_cpu_vm_stats. Purpose of that patch was to allow other threads to run in non-preemptive case. This patch, makes sure that cond_resched() gets called when !CONFIG_PREEMPT is set. In a preemptiable kernel we don't need to call cond_resched().

Signed-off-by: Rakib Mullick <rakib.mullick@xxxxxxxxx>
---

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 20c18b7..72cf857 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -461,7 +461,11 @@ void refresh_cpu_vm_stats(int cpu)
 				p->expire = 3;
 #endif
 			}
+
+#ifndef CONFIG_PREEMPT
 		cond_resched();
+#endif
+
 #ifdef CONFIG_NUMA
 		/*
 		 * Deal with draining the remote pageset of this


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