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mm,vmacache: count number of system-wide flushes

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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>
This commit is contained in:
Davidlohr Bueso 2014-12-12 16:56:10 -08:00 committed by Linus Torvalds
parent 16a7ade8af
commit f5f302e212
3 changed files with 4 additions and 0 deletions
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1
include/linux/vm_event_item.h
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@ -90,6 +90,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#ifdef CONFIG_DEBUG_VM_VMACACHE #ifdef CONFIG_DEBUG_VM_VMACACHE
VMACACHE_FIND_CALLS, VMACACHE_FIND_CALLS,
VMACACHE_FIND_HITS, VMACACHE_FIND_HITS,
VMACACHE_FULL_FLUSHES,
#endif #endif
NR_VM_EVENT_ITEMS NR_VM_EVENT_ITEMS
}; };

2
mm/vmacache.c
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@ -17,6 +17,8 @@ void vmacache_flush_all(struct mm_struct *mm)
{ {
struct task_struct *g, *p; struct task_struct *g, *p;
count_vm_vmacache_event(VMACACHE_FULL_FLUSHES);
/* /*
* Single threaded tasks need not iterate the entire * Single threaded tasks need not iterate the entire
* list of process. We can avoid the flushing as well * list of process. We can avoid the flushing as well

1
mm/vmstat.c
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@ -900,6 +900,7 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_DEBUG_VM_VMACACHE #ifdef CONFIG_DEBUG_VM_VMACACHE
"vmacache_find_calls", "vmacache_find_calls",
"vmacache_find_hits", "vmacache_find_hits",
"vmacache_full_flushes",
#endif #endif
#endif /* CONFIG_VM_EVENTS_COUNTERS */ #endif /* CONFIG_VM_EVENTS_COUNTERS */
}; };