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| author |   Davidlohr Bueso <davidlohr@hp.com> | 2014-06-04 16:06:46 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:53:57 -0700 |
| commit | 4f115147ff802267d0aa41e361c5aa5bd933d896 (patch) | |
| tree | 27afdf3f60c21fde601df63d9e9998b0c758a3fe /include/linux/vmstat.h | |
| parent | mm: only force scan in reclaim when none of the LRUs are big enough. (diff) | |
| download | wireguard-linux-4f115147ff802267d0aa41e361c5aa5bd933d896.tar.xz wireguard-linux-4f115147ff802267d0aa41e361c5aa5bd933d896.zip | |
mm,vmacache: add debug data
Introduce a CONFIG_DEBUG_VM_VMACACHE option to enable counting the cache
hit rate -- exported in /proc/vmstat.
Any updates to the caching scheme needs this kind of data, thus it can
save some work re-implementing the counting all the time.
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/vmstat.h')
| -rw-r--r-- | include/linux/vmstat.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 45c9cd1daf7a..82e7db7f7100 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -95,6 +95,12 @@ static inline void vm_events_fold_cpu(int cpu) #define count_vm_tlb_events(x, y) do { (void)(y); } while (0) #endif +#ifdef CONFIG_DEBUG_VM_VMACACHE +#define count_vm_vmacache_event(x) count_vm_event(x) +#else +#define count_vm_vmacache_event(x) do {} while (0) +#endif + #define __count_zone_vm_events(item, zone, delta) \ __count_vm_events(item##_NORMAL - ZONE_NORMAL + \ zone_idx(zone), delta) |