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mm, pcp: share common code between memory hotplug and percpu sysctl handler 

Both the percpu_pagelist_fraction sysctl handler and memory hotplug have
a common requirement of updating the pcpu page allocation batch and high
values.  Split the relevant helper to share common code.

No functional change.

Link: http://lkml.kernel.org/r/20191021094808.28824-3-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Qian Cai <cai@lca.pw>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2019-11-30 17:55:11 -08:00 committed by Linus Torvalds
parent 5e27a2df03
commit cb1ef534ce
1 changed files with 12 additions and 11 deletions
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23
mm/page_alloc.c
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@ -7988,6 +7988,15 @@ int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write,
return 0;
}
static void __zone_pcp_update(struct zone *zone)
{
unsigned int cpu;
for_each_possible_cpu(cpu)
pageset_set_high_and_batch(zone,
per_cpu_ptr(zone->pageset, cpu));
}
/*
* percpu_pagelist_fraction - changes the pcp->high for each zone on each
* cpu. It is the fraction of total pages in each zone that a hot per cpu
@ -8019,13 +8028,8 @@ int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write,
if (percpu_pagelist_fraction == old_percpu_pagelist_fraction)
goto out;
for_each_populated_zone(zone) {
unsigned int cpu;
for_each_possible_cpu(cpu)
pageset_set_high_and_batch(zone,
per_cpu_ptr(zone->pageset, cpu));
}
for_each_populated_zone(zone)
__zone_pcp_update(zone);
out:
mutex_unlock(&pcp_batch_high_lock);
return ret;
@ -8624,11 +8628,8 @@ void free_contig_range(unsigned long pfn, unsigned int nr_pages)
*/
void __meminit zone_pcp_update(struct zone *zone)
{
unsigned cpu;
mutex_lock(&pcp_batch_high_lock);
for_each_possible_cpu(cpu)
pageset_set_high_and_batch(zone,
per_cpu_ptr(zone->pageset, cpu));
__zone_pcp_update(zone);
mutex_unlock(&pcp_batch_high_lock);
}