diff options
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a61706193c31..f46b8615de6c 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -781,6 +781,32 @@ void mem_cgroup_end_migration(struct page *newpage) } /* + * A call to try to shrink memory usage under specified resource controller. + * This is typically used for page reclaiming for shmem for reducing side + * effect of page allocation from shmem, which is used by some mem_cgroup. + */ +int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask) +{ + struct mem_cgroup *mem; + int progress = 0; + int retry = MEM_CGROUP_RECLAIM_RETRIES; + + rcu_read_lock(); + mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); + css_get(&mem->css); + rcu_read_unlock(); + + do { + progress = try_to_free_mem_cgroup_pages(mem, gfp_mask); + } while (!progress && --retry); + + css_put(&mem->css); + if (!retry) + return -ENOMEM; + return 0; +} + +/* * This routine traverse page_cgroup in given list and drop them all. * *And* this routine doesn't reclaim page itself, just removes page_cgroup. */ |