Messages in this thread Patch in this message | | | Date | Tue, 9 Nov 2010 12:05:21 +0100 | From | Johannes Weiner <> | Subject | [patch] memcg: fix unit mismatch in memcg oom limit calculation |
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Adding the number of swap pages to the byte limit of a memory control group makes no sense. Convert the pages to bytes before adding them.
The only user of this code is the OOM killer, and the way it is used means that the error results in a higher OOM badness value. Since the cgroup limit is the same for all tasks in the cgroup, the error should have no practical impact at the moment.
But let's not wait for future or changing users to trip over it.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> --- mm/memcontrol.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1552,8 +1552,9 @@ u64 mem_cgroup_get_limit(struct mem_cgro u64 limit; u64 memsw; - limit = res_counter_read_u64(&memcg->res, RES_LIMIT) + - total_swap_pages; + limit = res_counter_read_u64(&memcg->res, RES_LIMIT); + limit += total_swap_pages << PAGE_SHIFT; + memsw = res_counter_read_u64(&memcg->memsw, RES_LIMIT); /* * If memsw is finite and limits the amount of swap space available
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