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memcg: lru_size instead of MEM_CGROUP_ZSTAT 

I never understood why we need a MEM_CGROUP_ZSTAT(mz, idx) macro to
obscure the LRU counts.  For easier searching? So call it lru_size
rather than bare count (lru_length sounds better, but would be wrong,
since each huge page raises lru_size hugely).

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: 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>
This commit is contained in:
Hugh Dickins 2012-03-21 16:34:19 -07:00 committed by Linus Torvalds
parent d79154bb52
commit 1eb4927251
1 changed files with 6 additions and 8 deletions
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14
mm/memcontrol.c
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@ -135,7 +135,7 @@ struct mem_cgroup_reclaim_iter {
*/
struct mem_cgroup_per_zone {
struct lruvec lruvec;
unsigned long count[NR_LRU_LISTS];
unsigned long lru_size[NR_LRU_LISTS];
struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];
@ -147,8 +147,6 @@ struct mem_cgroup_per_zone {
struct mem_cgroup *memcg; /* Back pointer, we cannot */
/* use container_of */
};
/* Macro for accessing counter */
#define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
struct mem_cgroup_per_node {
struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
@ -728,7 +726,7 @@ mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
for_each_lru(l) {
if (BIT(l) & lru_mask)
ret += MEM_CGROUP_ZSTAT(mz, l);
ret += mz->lru_size[l];
}
return ret;
}
@ -1077,7 +1075,7 @@ struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page,
mz = page_cgroup_zoneinfo(memcg, page);
/* compound_order() is stabilized through lru_lock */
MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
mz->lru_size[lru] += 1 << compound_order(page);
return &mz->lruvec;
}
@ -1105,8 +1103,8 @@ void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
VM_BUG_ON(!memcg);
mz = page_cgroup_zoneinfo(memcg, page);
/* huge page split is done under lru_lock. so, we have no races. */
VM_BUG_ON(MEM_CGROUP_ZSTAT(mz, lru) < (1 << compound_order(page)));
MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
VM_BUG_ON(mz->lru_size[lru] < (1 << compound_order(page)));
mz->lru_size[lru] -= 1 << compound_order(page);
}
void mem_cgroup_lru_del(struct page *page)
@ -3629,7 +3627,7 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
mz = mem_cgroup_zoneinfo(memcg, node, zid);
list = &mz->lruvec.lists[lru];
loop = MEM_CGROUP_ZSTAT(mz, lru);
loop = mz->lru_size[lru];
/* give some margin against EBUSY etc...*/
loop += 256;
busy = NULL;