mm,vmacache: count number of system-wide flushes

These flushes deal with sequence number overflows, such as for long lived threads. These are rare, but interesting from a debugging PoV. As such, display the number of flushes when vmacache debugging is enabled. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mariobalanica · Dec 13, 2014 · f5f302e · f5f302e
1 parent 16a7ade
commit f5f302e
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diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
@@ -90,6 +90,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 #ifdef CONFIG_DEBUG_VM_VMACACHE
 		VMACACHE_FIND_CALLS,
 		VMACACHE_FIND_HITS,
+		VMACACHE_FULL_FLUSHES,
 #endif
 		NR_VM_EVENT_ITEMS
 };

diff --git a/mm/vmacache.c b/mm/vmacache.c
@@ -17,6 +17,8 @@ void vmacache_flush_all(struct mm_struct *mm)
 {
 	struct task_struct *g, *p;
 
+	count_vm_vmacache_event(VMACACHE_FULL_FLUSHES);
+
 	/*
 	 * Single threaded tasks need not iterate the entire
 	 * list of process. We can avoid the flushing as well

diff --git a/mm/vmstat.c b/mm/vmstat.c
@@ -900,6 +900,7 @@ const char * const vmstat_text[] = {
 #ifdef CONFIG_DEBUG_VM_VMACACHE
 	"vmacache_find_calls",
 	"vmacache_find_hits",
+	"vmacache_full_flushes",
 #endif
 #endif /* CONFIG_VM_EVENTS_COUNTERS */
 };