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mm: vmstat: use a single setter function and callback for adjusting percpu thresholds

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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.

[[email protected]: readability tweak]
[[email protected]: set_pgdat_percpu_threshold(): don't use for_each_online_cpu]
Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Christoph Lameter <[email protected]>
Reviewed-by: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2011-01-13 15:45:43 -08:00 • committed by Linus Torvalds
commit b44129b306
3 changed files with 30 additions and 35 deletions
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36
mm/vmstat.c
View file

@ -83,7 +83,7 @@ EXPORT_SYMBOL(vm_stat);
#ifdef CONFIG_SMP
static int calculate_pressure_threshold(struct zone *zone)
int calculate_pressure_threshold(struct zone *zone)
{
int threshold;
int watermark_distance;
@ -107,7 +107,7 @@ static int calculate_pressure_threshold(struct zone *zone)
return threshold;
}
static int calculate_threshold(struct zone *zone)
int calculate_normal_threshold(struct zone *zone)
{
int threshold;
int mem; /* memory in 128 MB units */
@ -166,7 +166,7 @@ static void refresh_zone_stat_thresholds(void)
for_each_populated_zone(zone) {
unsigned long max_drift, tolerate_drift;
threshold = calculate_threshold(zone);
threshold = calculate_normal_threshold(zone);
for_each_online_cpu(cpu)
per_cpu_ptr(zone->pageset, cpu)->stat_threshold
@ -185,46 +185,24 @@ static void refresh_zone_stat_thresholds(void)
}
}
void reduce_pgdat_percpu_threshold(pg_data_t *pgdat)
void set_pgdat_percpu_threshold(pg_data_t *pgdat,
int (*calculate_pressure)(struct zone *))
{
struct zone *zone;
int cpu;
int threshold;
int i;
get_online_cpus();
for (i = 0; i < pgdat->nr_zones; i++) {
zone = &pgdat->node_zones[i];
if (!zone->percpu_drift_mark)
continue;
threshold = calculate_pressure_threshold(zone);
for_each_online_cpu(cpu)
threshold = (*calculate_pressure)(zone);
for_each_possible_cpu(cpu)
per_cpu_ptr(zone->pageset, cpu)->stat_threshold
= threshold;
}
put_online_cpus();
}
void restore_pgdat_percpu_threshold(pg_data_t *pgdat)
{
struct zone *zone;
int cpu;
int threshold;
int i;
get_online_cpus();
for (i = 0; i < pgdat->nr_zones; i++) {
zone = &pgdat->node_zones[i];
if (!zone->percpu_drift_mark)
continue;
threshold = calculate_threshold(zone);
for_each_online_cpu(cpu)
per_cpu_ptr(zone->pageset, cpu)->stat_threshold
= threshold;
}
put_online_cpus();
}
/*