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| author | Mel Gorman <mgorman@suse.de> | 2014-01-21 14:33:16 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-01-25 09:10:41 +0100 |
| commit | ec65993443736a5091b68e80ff1734548944a4b8 (patch) | |
| tree | a2f9e960f8b9113012118de382ffcda741a1feaf /include/linux/vmstat.h | |
| parent | 2993ae3305ad10b41e0d0bc2662f7754ee8e30fa (diff) | |
| download | linux-ec65993443736a5091b68e80ff1734548944a4b8.tar.gz linux-ec65993443736a5091b68e80ff1734548944a4b8.tar.bz2 linux-ec65993443736a5091b68e80ff1734548944a4b8.zip | |
mm, x86: Account for TLB flushes only when debugging
Bisection between 3.11 and 3.12 fingered commit 9824cf97 ("mm:
vmstats: tlb flush counters") to cause overhead problems.
The counters are undeniably useful but how often do we really
need to debug TLB flush related issues? It does not justify
taking the penalty everywhere so make it a debugging option.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Tested-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-XzxjntugxuwpxXhcrxqqh53b@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/vmstat.h')
| -rw-r--r-- | include/linux/vmstat.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index e4b948080d20..80ebba9c2e87 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -83,6 +83,14 @@ static inline void vm_events_fold_cpu(int cpu) #define count_vm_numa_events(x, y) do { (void)(y); } while (0) #endif /* CONFIG_NUMA_BALANCING */ +#ifdef CONFIG_DEBUG_TLBFLUSH +#define count_vm_tlb_event(x) count_vm_event(x) +#define count_vm_tlb_events(x, y) count_vm_events(x, y) +#else +#define count_vm_tlb_event(x) do {} while (0) +#define count_vm_tlb_events(x, y) do { (void)(y); } while (0) +#endif + #define __count_zone_vm_events(item, zone, delta) \ __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ zone_idx(zone), delta) |