The patch titled
memcg: modify accounting function for supporting THP better
has been added to the -mm tree. Its filename is
memcg-modify-accounting-function-for-supporting-thp-better.patch
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------------------------------------------------------
Subject: memcg: modify accounting function for supporting THP better
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
mem_cgroup_charge_statisics() was designed for charging a page but now, we
have transparent hugepage. To fix problems (in following patch) it's
required to change the function to get the number of pages as its
arguments.
The new function gets following as argument.
- type of page rather than 'pc'
- size of page which is accounted.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff -puN mm/memcontrol.c~memcg-modify-accounting-function-for-supporting-thp-better mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-modify-accounting-function-for-supporting-thp-better
+++ a/mm/memcontrol.c
@@ -600,23 +600,22 @@ static void mem_cgroup_swap_statistics(s
}
static void mem_cgroup_charge_statistics(struct mem_cgroup *mem,
- struct page_cgroup *pc,
- bool charge)
+ bool file, int nr_pages)
{
- int val = (charge) ? 1 : -1;
-
preempt_disable();
- if (PageCgroupCache(pc))
- __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], val);
+ if (file)
+ __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], nr_pages);
else
- __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], val);
+ __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], nr_pages);
- if (charge)
+ /* pagein of a big page is an event. So, ignore page size */
+ if (nr_pages > 0)
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]);
else
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]);
- __this_cpu_inc(mem->stat->count[MEM_CGROUP_EVENTS]);
+
+ __this_cpu_add(mem->stat->count[MEM_CGROUP_EVENTS], nr_pages);
preempt_enable();
}
@@ -2115,7 +2114,7 @@ static void ____mem_cgroup_commit_charge
break;
}
- mem_cgroup_charge_statistics(mem, pc, true);
+ mem_cgroup_charge_statistics(mem, PageCgroupCache(pc), 1);
}
static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
@@ -2186,14 +2185,14 @@ static void __mem_cgroup_move_account(st
__this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
preempt_enable();
}
- mem_cgroup_charge_statistics(from, pc, false);
+ mem_cgroup_charge_statistics(from, PageCgroupCache(pc), -1);
if (uncharge)
/* This is not "cancel", but cancel_charge does all we need. */
mem_cgroup_cancel_charge(from, PAGE_SIZE);
/* caller should have done css_get */
pc->mem_cgroup = to;
- mem_cgroup_charge_statistics(to, pc, true);
+ mem_cgroup_charge_statistics(to, PageCgroupCache(pc), 1);
/*
* We charges against "to" which may not have any tasks. Then, "to"
* can be under rmdir(). But in current implementation, caller of
@@ -2597,7 +2596,7 @@ __mem_cgroup_uncharge_common(struct page
}
for (i = 0; i < count; i++)
- mem_cgroup_charge_statistics(mem, pc + i, false);
+ mem_cgroup_charge_statistics(mem, PageCgroupCache(pc), -1);
ClearPageCgroupUsed(pc);
/*
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
memcg-modify-accounting-function-for-supporting-thp-better.patch
memcg-fix-used-bit-handling-at-uncharge-in-thp.patch
memcg-fix-lru-accounting-with-thp.patch
memcg-fix-rmdir-force_empty-with-thp.patch
memcg-correctly-order-reading-pcg_used-and-pc-mem_cgroup.patch
mm-add-replace_page_cache_page-function.patch
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