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| author | Davidlohr Bueso <dave@stgolabs.net> | 2014-12-13 01:56:10 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 21:42:48 +0100 |
| commit | f5f302e21257ebb0c074bbafc37606c26d28cc3d (patch) | |
| tree | 9487dd9bdf2df8a1989af3dde28d64b84f04ede5 /mm | |
| parent | Documentation: add new page_owner document (diff) | |
| download | linux-f5f302e21257ebb0c074bbafc37606c26d28cc3d.tar.xz linux-f5f302e21257ebb0c074bbafc37606c26d28cc3d.zip | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmacache.c | 2 | ||||
| -rw-r--r-- | mm/vmstat.c | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/mm/vmacache.c b/mm/vmacache.c index 9f25af825dec..b6e3662fe339 100644 --- 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 index b090e9e3d626..1284f89fca08 100644 --- 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 */ }; |