linux-kernel - [PATCH v6 03/17] mm: Assign id to every memcg-aware shrinker

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <152663292827.5308.15476497557507652648.stgit@localhost.localdomain>
Date:   Fri, 18 May 2018 11:42:08 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     akpm@...ux-foundation.org, vdavydov.dev@...il.com,
        shakeelb@...gle.com, viro@...iv.linux.org.uk, hannes@...xchg.org,
        mhocko@...nel.org, ktkhai@...tuozzo.com, tglx@...utronix.de,
        pombredanne@...b.com, stummala@...eaurora.org,
        gregkh@...uxfoundation.org, sfr@...b.auug.org.au, guro@...com,
        mka@...omium.org, penguin-kernel@...ove.SAKURA.ne.jp,
        chris@...is-wilson.co.uk, longman@...hat.com, minchan@...nel.org,
        ying.huang@...el.com, mgorman@...hsingularity.net, jbacik@...com,
        linux@...ck-us.net, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, willy@...radead.org, lirongqing@...du.com,
        aryabinin@...tuozzo.com
Subject: [PATCH v6 03/17] mm: Assign id to every memcg-aware shrinker

The patch introduces shrinker::id number, which is used to enumerate
memcg-aware shrinkers. The number start from 0, and the code tries
to maintain it as small as possible.

This will be used as to represent a memcg-aware shrinkers in memcg
shrinkers map.

Since all memcg-aware shrinkers are based on list_lru, which is per-memcg
in case of !CONFIG_MEMCG_KMEM only, the new functionality will be under
this config option.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 include/linux/shrinker.h |    4 +++
 mm/vmscan.c              |   60 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index 6794490f25b2..7ca9c18cf130 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -66,6 +66,10 @@ struct shrinker {
 
 	/* These are for internal use */
 	struct list_head list;
+#ifdef CONFIG_MEMCG_KMEM
+	/* ID in shrinker_idr */
+	int id;
+#endif
 	/* objs pending delete, per node */
 	atomic_long_t *nr_deferred;
 };
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 50055d72f294..3de12a9bdf85 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -169,6 +169,48 @@ unsigned long vm_total_pages;
 static LIST_HEAD(shrinker_list);
 static DECLARE_RWSEM(shrinker_rwsem);
 
+#ifdef CONFIG_MEMCG_KMEM
+static DEFINE_IDR(shrinker_idr);
+
+static int prealloc_memcg_shrinker(struct shrinker *shrinker)
+{
+	int id, ret;
+
+	shrinker->id = -1;
+	down_write(&shrinker_rwsem);
+	ret = id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
+	if (ret < 0)
+		goto unlock;
+	shrinker->id = id;
+	ret = 0;
+unlock:
+	up_write(&shrinker_rwsem);
+	return ret;
+}
+
+static void unregister_memcg_shrinker(struct shrinker *shrinker)
+{
+	int id = shrinker->id;
+
+	if (id < 0)
+		return;
+
+	down_write(&shrinker_rwsem);
+	idr_remove(&shrinker_idr, id);
+	up_write(&shrinker_rwsem);
+	shrinker->id = -1;
+}
+#else /* CONFIG_MEMCG_KMEM */
+static int prealloc_memcg_shrinker(struct shrinker *shrinker)
+{
+	return 0;
+}
+
+static void unregister_memcg_shrinker(struct shrinker *shrinker)
+{
+}
+#endif /* CONFIG_MEMCG_KMEM */
+
 #ifdef CONFIG_MEMCG
 static bool global_reclaim(struct scan_control *sc)
 {
@@ -306,6 +348,7 @@ unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone
 int prealloc_shrinker(struct shrinker *shrinker)
 {
 	size_t size = sizeof(*shrinker->nr_deferred);
+	int ret;
 
 	if (shrinker->flags & SHRINKER_NUMA_AWARE)
 		size *= nr_node_ids;
@@ -313,11 +356,26 @@ int prealloc_shrinker(struct shrinker *shrinker)
 	shrinker->nr_deferred = kzalloc(size, GFP_KERNEL);
 	if (!shrinker->nr_deferred)
 		return -ENOMEM;
+
+	if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
+		ret = prealloc_memcg_shrinker(shrinker);
+		if (ret)
+			goto free_deferred;
+	}
+
 	return 0;
+
+free_deferred:
+	kfree(shrinker->nr_deferred);
+	shrinker->nr_deferred = NULL;
+	return -ENOMEM;
 }
 
 void free_prealloced_shrinker(struct shrinker *shrinker)
 {
+	if (shrinker->flags & SHRINKER_MEMCG_AWARE)
+		unregister_memcg_shrinker(shrinker);
+
 	kfree(shrinker->nr_deferred);
 	shrinker->nr_deferred = NULL;
 }
@@ -347,6 +405,8 @@ void unregister_shrinker(struct shrinker *shrinker)
 {
 	if (!shrinker->nr_deferred)
 		return;
+	if (shrinker->flags & SHRINKER_MEMCG_AWARE)
+		unregister_memcg_shrinker(shrinker);
 	down_write(&shrinker_rwsem);
 	list_del(&shrinker->list);
 	up_write(&shrinker_rwsem);