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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2014-12-12 16:56:10 -08:00 • committed by Linus Torvalds
commit f5f302e212
3 changed files with 4 additions and 0 deletions
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mm/vmacache.c
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@ -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