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From: Kirill Tkhai <ktkhai@virtuozzo.com>
To: vdavydov.dev@gmail.com, shakeelb@google.com,
	viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org,
	tglx@linutronix.de, pombredanne@nexb.com,
	stummala@codeaurora.org, gregkh@linuxfoundation.org,
	sfr@canb.auug.org.au, guro@fb.com, mka@chromium.org,
	penguin-kernel@I-love.SAKURA.ne.jp, chris@chris-wilson.co.uk,
	longman@redhat.com, minchan@kernel.org, ying.huang@intel.com,
	mgorman@techsingularity.net, jbacik@fb.com, linux@roeck-us.net,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	willy@infradead.org, lirongqing@baidu.com,
	aryabinin@virtuozzo.com, akpm@linux-foundation.org,
	ktkhai@virtuozzo.com
Subject: [PATCH v9 15/17] mm: Generalize shrink_slab() calls in shrink_node()
Date: Mon, 09 Jul 2018 11:39:55 +0300
Message-ID: <153112559593.4097.7399035563205590079.stgit@localhost.localdomain> (raw)
In-Reply-To: <153112469064.4097.2581798353485457328.stgit@localhost.localdomain>

From: Vladimir Davydov <vdavydov.dev@gmail.com>

The patch makes shrink_slab() be called for root_mem_cgroup
in the same way as it's called for the rest of cgroups.
This simplifies the logic and improves the readability.

Signed-off-by: Vladimir Davydov <vdavydov.dev@gmail.com>
ktkhai: Description written.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Tested-by: Shakeel Butt <shakeelb@google.com>
---
 mm/vmscan.c |   21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d7a5b8566869..2aa3cb760189 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -627,10 +627,8 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
  * @nid is passed along to shrinkers with SHRINKER_NUMA_AWARE set,
  * unaware shrinkers will receive a node id of 0 instead.
  *
- * @memcg specifies the memory cgroup to target. If it is not NULL,
- * only shrinkers with SHRINKER_MEMCG_AWARE set will be called to scan
- * objects from the memory cgroup specified. Otherwise, only unaware
- * shrinkers are called.
+ * @memcg specifies the memory cgroup to target. Unaware shrinkers
+ * are called only if it is the root cgroup.
  *
  * @priority is sc->priority, we take the number of objects and >> by priority
  * in order to get the scan target.
@@ -644,7 +642,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
 	struct shrinker *shrinker;
 	unsigned long freed = 0;
 
-	if (memcg && !mem_cgroup_is_root(memcg))
+	if (!mem_cgroup_is_root(memcg))
 		return shrink_slab_memcg(gfp_mask, nid, memcg, priority);
 
 	if (!down_read_trylock(&shrinker_rwsem))
@@ -657,9 +655,6 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
 			.memcg = memcg,
 		};
 
-		if (!!memcg != !!(shrinker->flags & SHRINKER_MEMCG_AWARE))
-			continue;
-
 		if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
 			sc.nid = 0;
 
@@ -689,6 +684,7 @@ void drop_slab_node(int nid)
 		struct mem_cgroup *memcg = NULL;
 
 		freed = 0;
+		memcg = mem_cgroup_iter(NULL, NULL, NULL);
 		do {
 			freed += shrink_slab(GFP_KERNEL, nid, memcg, 0);
 		} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
@@ -2708,9 +2704,8 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 			shrink_node_memcg(pgdat, memcg, sc, &lru_pages);
 			node_lru_pages += lru_pages;
 
-			if (memcg)
-				shrink_slab(sc->gfp_mask, pgdat->node_id,
-					    memcg, sc->priority);
+			shrink_slab(sc->gfp_mask, pgdat->node_id,
+				    memcg, sc->priority);
 
 			/* Record the group's reclaim efficiency */
 			vmpressure(sc->gfp_mask, memcg, false,
@@ -2734,10 +2729,6 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 			}
 		} while ((memcg = mem_cgroup_iter(root, memcg, &reclaim)));
 
-		if (global_reclaim(sc))
-			shrink_slab(sc->gfp_mask, pgdat->node_id, NULL,
-				    sc->priority);
-
 		if (reclaim_state) {
 			sc->nr_reclaimed += reclaim_state->reclaimed_slab;
 			reclaim_state->reclaimed_slab = 0;


  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-09  8:37 [PATCH v9 00/17] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n)) Kirill Tkhai
2018-07-09  8:37 ` [PATCH v9 01/17] list_lru: Combine code under the same define Kirill Tkhai
2018-07-09  8:37 ` [PATCH v9 02/17] mm: Introduce CONFIG_MEMCG_KMEM as combination of CONFIG_MEMCG && !CONFIG_SLOB Kirill Tkhai
2018-07-09  8:37 ` [PATCH v9 03/17] mm: Assign id to every memcg-aware shrinker Kirill Tkhai
2018-07-09  8:37 ` [PATCH v9 04/17] memcg: Move up for_each_mem_cgroup{, _tree} defines Kirill Tkhai
2018-07-09  8:38 ` [PATCH v9 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg Kirill Tkhai
2018-07-09  8:38 ` [PATCH v9 06/17] mm: Refactoring in workingset_init() Kirill Tkhai
2018-07-09  8:38 ` [PATCH v9 07/17] fs: Refactoring in alloc_super() Kirill Tkhai
2018-07-09  8:38 ` [PATCH v9 08/17] From: Kirill Tkhai <ktkhai@virtuozzo.com> Kirill Tkhai
2018-07-09  8:38 ` [PATCH v9 09/17] list_lru: Add memcg argument to list_lru_from_kmem() Kirill Tkhai
2018-07-09  8:39 ` [PATCH v9 10/17] From: Kirill Tkhai <ktkhai@virtuozzo.com> Kirill Tkhai
2018-07-09  8:39 ` [PATCH v9 11/17] list_lru: Pass lru argument to memcg_drain_list_lru_node() Kirill Tkhai
2018-07-09  8:39 ` [PATCH v9 12/17] mm: Export mem_cgroup_is_root() Kirill Tkhai
2018-07-09  8:39 ` [PATCH v9 13/17] mm: Set bit in memcg shrinker bitmap on first list_lru item apearance Kirill Tkhai
2018-07-09  8:39 ` [PATCH v9 14/17] mm: Iterate only over charged shrinkers during memcg shrink_slab() Kirill Tkhai
2018-07-09  8:39 ` Kirill Tkhai [this message]
2018-07-09  8:40 ` [PATCH v9 16/17] From: Kirill Tkhai <ktkhai@virtuozzo.com> Kirill Tkhai
2018-07-09  8:40 ` [PATCH v9 17/17] mm: Clear shrinker bit if there are no objects related to memcg Kirill Tkhai
2018-07-09  8:43 ` [PATCH v9 00/17] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n)) Kirill Tkhai

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