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| author | Mel Gorman <mel@csn.ul.ie> | 2011-01-13 15:45:43 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-07 15:05:21 -0800 |
| commit | 776be4763c7ece9b738c5a61bec68bc05b1b2d1c (patch) | |
| tree | e7a56436ebd890216a341c8b5cc3eed5932c2361 /include/linux/vmstat.h | |
| parent | 176111faba2c5785d40b4737908b855de75f026c (diff) | |
| download | lwn-776be4763c7ece9b738c5a61bec68bc05b1b2d1c.tar.gz lwn-776be4763c7ece9b738c5a61bec68bc05b1b2d1c.zip | |
mm: vmstat: use a single setter function and callback for adjusting percpu thresholds
commit b44129b30652c8771db2265939bb8b463724043d upstream.
reduce_pgdat_percpu_threshold() and restore_pgdat_percpu_threshold() exist
to adjust the per-cpu vmstat thresholds while kswapd is awake to avoid
errors due to counter drift. The functions duplicate some code so this
patch replaces them with a single set_pgdat_percpu_threshold() that takes
a callback function to calculate the desired threshold as a parameter.
[akpm@linux-foundation.org: readability tweak]
[kosaki.motohiro@jp.fujitsu.com: set_pgdat_percpu_threshold(): don't use for_each_online_cpu]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Christoph Lameter <cl@linux.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/vmstat.h')
| -rw-r--r-- | include/linux/vmstat.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index e4cc21cf5870..833e676d6d92 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -254,8 +254,11 @@ extern void dec_zone_state(struct zone *, enum zone_stat_item); extern void __dec_zone_state(struct zone *, enum zone_stat_item); void refresh_cpu_vm_stats(int); -void reduce_pgdat_percpu_threshold(pg_data_t *pgdat); -void restore_pgdat_percpu_threshold(pg_data_t *pgdat); + +int calculate_pressure_threshold(struct zone *zone); +int calculate_normal_threshold(struct zone *zone); +void set_pgdat_percpu_threshold(pg_data_t *pgdat, + int (*calculate_pressure)(struct zone *)); #else /* CONFIG_SMP */ /* @@ -300,8 +303,7 @@ static inline void __dec_zone_page_state(struct page *page, #define dec_zone_page_state __dec_zone_page_state #define mod_zone_page_state __mod_zone_page_state -static inline void reduce_pgdat_percpu_threshold(pg_data_t *pgdat) { } -static inline void restore_pgdat_percpu_threshold(pg_data_t *pgdat) { } +#define set_pgdat_percpu_threshold(pgdat, callback) { } static inline void refresh_cpu_vm_stats(int cpu) { } #endif |