Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: [PATCH v7 03/17] mm: Assign id to every memcg-aware shrinker
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
To:     akpm@linux-foundation.org, vdavydov.dev@gmail.com,
        shakeelb@google.com, viro@zeniv.linux.org.uk, hannes@cmpxchg.org,
        mhocko@kernel.org, ktkhai@virtuozzo.com, 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
Date:   Tue, 22 May 2018 13:07:43 +0300
Message-ID: <152698366374.3393.240092291013126670.stgit@localhost.localdomain>
In-Reply-To: <152698356466.3393.5351712806709424140.stgit@localhost.localdomain>
References: <152698356466.3393.5351712806709424140.stgit@localhost.localdomain>
User-Agent: StGit/0.18
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Received-SPF: None (protection.outlook.com: virtuozzo.com does not designate
 permitted sender hosts)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 May 2018 10:07:47.4987 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 5b7d3efb-b06f-4276-1272-08d5bfcbdfbd
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f
X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0801MB1338
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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@virtuozzo.com>
---
 include/linux/shrinker.h |    4 +++
 mm/vmscan.c              |   62 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 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..75b00e6ff9db 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -169,6 +169,49 @@ 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 shrinker_nr_max;
+
+static int prealloc_memcg_shrinker(struct shrinker *shrinker)
+{
+	int id, ret = -ENOMEM;
+
+	down_write(&shrinker_rwsem);
+	id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
+	if (id < 0)
+		goto unlock;
+
+	if (id >= shrinker_nr_max)
+		shrinker_nr_max = id + 1;
+	shrinker->id = id;
+	ret = 0;
+unlock:
+	up_write(&shrinker_rwsem);
+	return ret;
+}
+
+static void unregister_memcg_shrinker(struct shrinker *shrinker)
+{
+	int id = shrinker->id;
+
+	BUG_ON(id < 0);
+
+	down_write(&shrinker_rwsem);
+	idr_remove(&shrinker_idr, id);
+	up_write(&shrinker_rwsem);
+}
+#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)
 {
@@ -313,13 +356,30 @@ 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) {
+		if (prealloc_memcg_shrinker(shrinker))
+			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->nr_deferred)
+		return;
+
 	kfree(shrinker->nr_deferred);
 	shrinker->nr_deferred = NULL;
+
+	if (shrinker->flags & SHRINKER_MEMCG_AWARE)
+		unregister_memcg_shrinker(shrinker);
 }
 
 void register_shrinker_prepared(struct shrinker *shrinker)
@@ -347,6 +407,8 @@ 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);