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vmstat: create fold_diff

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Both functions that update global counters use the same mechanism.

Create a function that contains the common code.

Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Tejun Heo <tj@kernel.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 4edb0748b23887140578d68f5f4e6e2de337a481
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
CRs-Fixed: 802343
Change-Id: I950dd72d854a8a078ea4e6d90422fa7b5e50b61c
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
Christoph Lameter 2013-09-11 14:21:31 -07:00 committed by Vinayak Menon
parent 1ba8ad85c1
commit 37b13061d3
1 changed files with 11 additions and 7 deletions
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18
mm/vmstat.c
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@ -417,6 +417,15 @@ void dec_zone_page_state(struct page *page, enum zone_stat_item item)
EXPORT_SYMBOL(dec_zone_page_state);
#endif
static inline void fold_diff(int *diff)
{
int i;
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
if (diff[i])
atomic_long_add(diff[i], &vm_stat[i]);
}
/*
* Update the zone counters for the current cpu.
*
@ -486,10 +495,7 @@ static void refresh_cpu_vm_stats(int cpu)
drain_zone_pages(zone, &p->pcp);
#endif
}
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
if (global_diff[i])
atomic_long_add(global_diff[i], &vm_stat[i]);
fold_diff(global_diff);
}
/*
@ -519,9 +525,7 @@ void cpu_vm_stats_fold(int cpu)
}
}
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
if (global_diff[i])
atomic_long_add(global_diff[i], &vm_stat[i]);
fold_diff(global_diff);
}
/*