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authorTejun Heo <tj@kernel.org>2018-07-03 18:14:56 +0300
committerJens Axboe <axboe@kernel.dk>2018-07-09 18:07:54 +0300
commit2cf855837b89d92996cf264713f3bed2bf9b0b4f (patch)
treed2e61e78a5dce7925bebb7c50d345838aa948b4a /mm/memcontrol.c
parentd09d8df3a29403693d9d20cc34ed101f2c558e2b (diff)
downloadlinux-2cf855837b89d92996cf264713f3bed2bf9b0b4f.tar.xz
memcontrol: schedule throttling if we are congested
Memory allocations can induce swapping via kswapd or direct reclaim. If we are having IO done for us by kswapd and don't actually go into direct reclaim we may never get scheduled for throttling. So instead check to see if our cgroup is congested, and if so schedule the throttling. Before we return to user space the throttling stuff will only throttle if we actually required it. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e6f0d5ef320a..64bd28d35388 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5593,6 +5593,19 @@ out:
return ret;
}
+int mem_cgroup_try_charge_delay(struct page *page, struct mm_struct *mm,
+ gfp_t gfp_mask, struct mem_cgroup **memcgp,
+ bool compound)
+{
+ struct mem_cgroup *memcg;
+ int ret;
+
+ ret = mem_cgroup_try_charge(page, mm, gfp_mask, memcgp, compound);
+ memcg = *memcgp;
+ mem_cgroup_throttle_swaprate(memcg, page_to_nid(page), gfp_mask);
+ return ret;
+}
+
/**
* mem_cgroup_commit_charge - commit a page charge
* @page: page to charge