[PATCH] memcg: more mem_cgroup_uncharge batching

[Hugh Dickins <hughd@google.com>]

It seems odd that truncate_inode_pages_range(), called not only when
truncating but also when evicting inodes, has mem_cgroup_uncharge_start
and _end() batching in its second loop to clear up a few leftovers, but
not in its first loop that does almost all the work: add them there too.

Signed-off-by: Hugh Dickins <hughd@google.com>
---

 mm/truncate.c |    2 ++
 1 file changed, 2 insertions(+)

--- 2.6.38-rc6/mm/truncate.c	2011-01-21 20:54:14.000000000 -0800
+++ linux/mm/truncate.c	2011-02-23 16:12:19.000000000 -0800
@@ -225,6 +225,7 @@ void truncate_inode_pages_range(struct a
 	next = start;
 	while (next <= end &&
 	       pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+		mem_cgroup_uncharge_start();
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 			pgoff_t page_index = page->index;
@@ -247,6 +248,7 @@ void truncate_inode_pages_range(struct a
 			unlock_page(page);
 		}
 		pagevec_release(&pvec);
+		mem_cgroup_uncharge_end();
 		cond_resched();
 	}
 

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