linux-kernel - [PATCH v2] memcg: refill_stock for kmem uncharging too

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Message-Id: <20190423154405.259178-1-shakeelb@google.com>
Date:   Tue, 23 Apr 2019 08:44:05 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shakeel Butt <shakeelb@...gle.com>
Subject: [PATCH v2] memcg: refill_stock for kmem uncharging too

The commit 475d0487a2ad ("mm: memcontrol: use per-cpu stocks for socket
memory uncharging") added refill_stock() for skmem uncharging path to
optimize workloads having high network traffic. Do the same for the kmem
uncharging as well. Though we can bypass the refill for the offlined
memcgs but it may impact the performance of network traffic for the
sockets used by other cgroups.

Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
Cc: Roman Gushchin <guro@...com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---

Changelog since v1:
- No need to bypass offline memcgs in the refill.

 mm/memcontrol.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2535e54e7989..2713b45ec3f0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2768,17 +2768,13 @@ void __memcg_kmem_uncharge(struct page *page, int order)
 	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
 		page_counter_uncharge(&memcg->kmem, nr_pages);
 
-	page_counter_uncharge(&memcg->memory, nr_pages);
-	if (do_memsw_account())
-		page_counter_uncharge(&memcg->memsw, nr_pages);
-
 	page->mem_cgroup = NULL;
 
 	/* slab pages do not have PageKmemcg flag set */
 	if (PageKmemcg(page))
 		__ClearPageKmemcg(page);
 
-	css_put_many(&memcg->css, nr_pages);
+	refill_stock(memcg, nr_pages);
 }
 #endif /* CONFIG_MEMCG_KMEM */
 
-- 
2.21.0.593.g511ec345e18-goog