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Commit f5f302e2 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds
Browse files

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: default avatarDavidlohr Bueso <dbueso@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 16a7ade8

include/linux/vm_event_item.h

+1 −0
Original line number Diff line number Diff line
@@ -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

};

mm/vmacache.c

+2 −0
Original line number Diff line number Diff line
@@ -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

mm/vmstat.c

+1 −0
Original line number Diff line number Diff line
@@ -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 */

};