diff options
| author | Kemi Wang <kemi.wang@intel.com> | 2017-09-09 02:12:55 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-09 04:26:47 +0300 |
| commit | 638032224ed762a29baca1fc37f1168efc2554ae (patch) | |
| tree | 41ec4e67d4698b0c3208afd182297882f49ecc1f /include/linux/vmstat.h | |
| parent | 1d90ca897cb05cf38bd62f36756d219e02913b7d (diff) | |
| download | linux-638032224ed762a29baca1fc37f1168efc2554ae.tar.xz | |
mm: consider the number in local CPUs when reading NUMA stats
To avoid deviation, the per cpu number of NUMA stats in
vm_numa_stat_diff[] is included when a user *reads* the NUMA stats.
Since NUMA stats does not be read by users frequently, and kernel does not
need it to make a decision, it will not be a problem to make the readers
more expensive.
Link: http://lkml.kernel.org/r/1503568801-21305-4-git-send-email-kemi.wang@intel.com
Signed-off-by: Kemi Wang <kemi.wang@intel.com>
Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Christopher Lameter <cl@linux.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Tim Chen <tim.c.chen@intel.com>
Cc: Ying Huang <ying.huang@intel.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, 5 insertions, 1 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 9ac82e29948f..ade7cb5f1359 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -125,10 +125,14 @@ static inline unsigned long global_numa_state(enum numa_stat_item item) return x; } -static inline unsigned long zone_numa_state(struct zone *zone, +static inline unsigned long zone_numa_state_snapshot(struct zone *zone, enum numa_stat_item item) { long x = atomic_long_read(&zone->vm_numa_stat[item]); + int cpu; + + for_each_online_cpu(cpu) + x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item]; return x; } |