diff options
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d06cae2de..caf3bf73b 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1262,7 +1262,7 @@ static unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg) return limit; } -static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, +static bool mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, int order) { struct oom_control oc = { @@ -1340,6 +1340,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, } unlock: mutex_unlock(&oom_lock); + return chosen; } #if MAX_NUMNODES > 1 @@ -5051,6 +5052,7 @@ static ssize_t memory_high_write(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) { struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); + unsigned long nr_pages; unsigned long high; int err; @@ -5061,6 +5063,11 @@ static ssize_t memory_high_write(struct kernfs_open_file *of, memcg->high = high; + nr_pages = page_counter_read(&memcg->memory); + if (nr_pages > high) + try_to_free_mem_cgroup_pages(memcg, nr_pages - high, + GFP_KERNEL, true); + memcg_wb_domain_size_changed(memcg); return nbytes; } @@ -5082,6 +5089,8 @@ static ssize_t memory_max_write(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) { struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); + unsigned int nr_reclaims = MEM_CGROUP_RECLAIM_RETRIES; + bool drained = false; unsigned long max; int err; @@ -5090,9 +5099,36 @@ static ssize_t memory_max_write(struct kernfs_open_file *of, if (err) return err; - err = mem_cgroup_resize_limit(memcg, max); - if (err) - return err; + xchg(&memcg->memory.limit, max); + + for (;;) { + unsigned long nr_pages = page_counter_read(&memcg->memory); + + if (nr_pages <= max) + break; + + if (signal_pending(current)) { + err = -EINTR; + break; + } + + if (!drained) { + drain_all_stock(memcg); + drained = true; + continue; + } + + if (nr_reclaims) { + if (!try_to_free_mem_cgroup_pages(memcg, nr_pages - max, + GFP_KERNEL, true)) + nr_reclaims--; + continue; + } + + mem_cgroup_events(memcg, MEMCG_OOM, 1); + if (!mem_cgroup_out_of_memory(memcg, GFP_KERNEL, 0)) + break; + } memcg_wb_domain_size_changed(memcg); return nbytes; |