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| author | Ingo Molnar | 2019-04-10 09:14:42 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2019-04-10 09:14:42 +0200 |
| commit | 54bbfe75cbb10384b0a62efae80fde21deea1dd0 (patch) | |
| tree | eed22c29cdecce36153bbb83ee7a9da7eed60ccd /mm/memcontrol.c | |
| parent | locking/rwsem: Optimize down_read_trylock() (diff) | |
| parent | Bluetooth: btusb: request wake pin with NOAUTOEN (diff) | |
| download | kernel-qcow2-linux-54bbfe75cbb10384b0a62efae80fde21deea1dd0.tar.gz kernel-qcow2-linux-54bbfe75cbb10384b0a62efae80fde21deea1dd0.tar.xz kernel-qcow2-linux-54bbfe75cbb10384b0a62efae80fde21deea1dd0.zip | |
Merge branch 'linus' into locking/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 532e0e2a4817..81a0d3914ec9 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3882,6 +3882,22 @@ struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) return &memcg->cgwb_domain; } +/* + * idx can be of type enum memcg_stat_item or node_stat_item. + * Keep in sync with memcg_exact_page(). + */ +static unsigned long memcg_exact_page_state(struct mem_cgroup *memcg, int idx) +{ + long x = atomic_long_read(&memcg->stat[idx]); + int cpu; + + for_each_online_cpu(cpu) + x += per_cpu_ptr(memcg->stat_cpu, cpu)->count[idx]; + if (x < 0) + x = 0; + return x; +} + /** * mem_cgroup_wb_stats - retrieve writeback related stats from its memcg * @wb: bdi_writeback in question @@ -3907,10 +3923,10 @@ void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css); struct mem_cgroup *parent; - *pdirty = memcg_page_state(memcg, NR_FILE_DIRTY); + *pdirty = memcg_exact_page_state(memcg, NR_FILE_DIRTY); /* this should eventually include NR_UNSTABLE_NFS */ - *pwriteback = memcg_page_state(memcg, NR_WRITEBACK); + *pwriteback = memcg_exact_page_state(memcg, NR_WRITEBACK); *pfilepages = mem_cgroup_nr_lru_pages(memcg, (1 << LRU_INACTIVE_FILE) | (1 << LRU_ACTIVE_FILE)); *pheadroom = PAGE_COUNTER_MAX; |