From: Kirill Tkhai <ktkhai@virtuozzo.com>
To: viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org,
vdavydov.dev@gmail.com, ktkhai@virtuozzo.com,
akpm@linux-foundation.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,
hillf.zj@alibaba-inc.com, ying.huang@intel.com,
mgorman@techsingularity.net, shakeelb@google.com, jbacik@fb.com,
linux@roeck-us.net, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, willy@infradead.org
Subject: [PATCH 01/10] mm: Assign id to every memcg-aware shrinker
Date: Wed, 21 Mar 2018 16:21:17 +0300 [thread overview]
Message-ID: <152163847740.21546.16821490541519326725.stgit@localhost.localdomain> (raw)
In-Reply-To: <152163840790.21546.980703278415599202.stgit@localhost.localdomain>
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.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
include/linux/shrinker.h | 1 +
mm/vmscan.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index a3894918a436..738de8ef5246 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -66,6 +66,7 @@ struct shrinker {
/* These are for internal use */
struct list_head list;
+ int id;
/* objs pending delete, per node */
atomic_long_t *nr_deferred;
};
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8fcd9f8d7390..91b5120b924f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -159,6 +159,56 @@ unsigned long vm_total_pages;
static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);
+#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
+static DEFINE_IDA(bitmap_id_ida);
+static DECLARE_RWSEM(bitmap_rwsem);
+static int bitmap_id_start;
+
+static int alloc_shrinker_id(struct shrinker *shrinker)
+{
+ int id, ret;
+
+ if (!(shrinker->flags & SHRINKER_MEMCG_AWARE))
+ return 0;
+retry:
+ ida_pre_get(&bitmap_id_ida, GFP_KERNEL);
+ down_write(&bitmap_rwsem);
+ ret = ida_get_new_above(&bitmap_id_ida, bitmap_id_start, &id);
+ if (!ret) {
+ shrinker->id = id;
+ bitmap_id_start = shrinker->id + 1;
+ }
+ up_write(&bitmap_rwsem);
+ if (ret == -EAGAIN)
+ goto retry;
+
+ return ret;
+}
+
+static void free_shrinker_id(struct shrinker *shrinker)
+{
+ int id = shrinker->id;
+
+ if (!(shrinker->flags & SHRINKER_MEMCG_AWARE))
+ return;
+
+ down_write(&bitmap_rwsem);
+ ida_remove(&bitmap_id_ida, id);
+ if (bitmap_id_start > id)
+ bitmap_id_start = id;
+ up_write(&bitmap_rwsem);
+}
+#else /* CONFIG_MEMCG && !CONFIG_SLOB */
+static int alloc_shrinker_id(struct shrinker *shrinker)
+{
+ return 0;
+}
+
+static void free_shrinker_id(struct shrinker *shrinker)
+{
+}
+#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
+
#ifdef CONFIG_MEMCG
static bool global_reclaim(struct scan_control *sc)
{
@@ -269,10 +319,18 @@ int register_shrinker(struct shrinker *shrinker)
if (!shrinker->nr_deferred)
return -ENOMEM;
+ if (alloc_shrinker_id(shrinker))
+ goto free_deferred;
+
down_write(&shrinker_rwsem);
list_add_tail(&shrinker->list, &shrinker_list);
up_write(&shrinker_rwsem);
return 0;
+
+free_deferred:
+ kfree(shrinker->nr_deferred);
+ shrinker->nr_deferred = NULL;
+ return -ENOMEM;
}
EXPORT_SYMBOL(register_shrinker);
@@ -286,6 +344,7 @@ void unregister_shrinker(struct shrinker *shrinker)
down_write(&shrinker_rwsem);
list_del(&shrinker->list);
up_write(&shrinker_rwsem);
+ free_shrinker_id(shrinker);
kfree(shrinker->nr_deferred);
shrinker->nr_deferred = NULL;
}
next prev parent reply other threads:[~2018-03-21 13:21 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-21 13:21 [PATCH 00/10] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n)) Kirill Tkhai
2018-03-21 13:21 ` Kirill Tkhai [this message]
2018-03-24 18:40 ` [PATCH 01/10] mm: Assign id to every memcg-aware shrinker Vladimir Davydov
2018-03-26 15:09 ` Kirill Tkhai
2018-03-26 15:14 ` Matthew Wilcox
2018-03-26 15:38 ` Kirill Tkhai
2018-03-27 9:15 ` Vladimir Davydov
2018-03-27 15:09 ` Kirill Tkhai
2018-03-27 15:48 ` Vladimir Davydov
2018-03-28 10:30 ` Kirill Tkhai
2018-03-28 11:02 ` Vladimir Davydov
2018-03-21 13:21 ` [PATCH 02/10] mm: Maintain memcg-aware shrinkers in mcg_shrinkers array Kirill Tkhai
2018-03-24 18:45 ` Vladimir Davydov
2018-03-26 15:20 ` Kirill Tkhai
2018-03-26 15:34 ` Matthew Wilcox
2018-03-27 9:18 ` Vladimir Davydov
2018-03-27 15:30 ` Kirill Tkhai
2018-03-21 13:21 ` [PATCH 03/10] mm: Assign memcg-aware shrinkers bitmap to memcg Kirill Tkhai
2018-03-21 14:56 ` Matthew Wilcox
2018-03-21 15:12 ` Kirill Tkhai
2018-03-21 15:26 ` Matthew Wilcox
2018-03-21 15:43 ` Kirill Tkhai
2018-03-21 16:20 ` Matthew Wilcox
2018-03-21 16:42 ` Kirill Tkhai
2018-03-21 17:54 ` Matthew Wilcox
2018-03-22 16:39 ` Kirill Tkhai
2018-03-23 9:06 ` kbuild test robot
2018-03-23 11:26 ` Kirill Tkhai
2018-03-24 19:25 ` Vladimir Davydov
2018-03-26 15:29 ` Kirill Tkhai
2018-03-27 10:00 ` Vladimir Davydov
2018-03-27 15:17 ` Kirill Tkhai
2018-03-21 13:21 ` [PATCH 04/10] fs: Propagate shrinker::id to list_lru Kirill Tkhai
2018-03-24 18:50 ` Vladimir Davydov
2018-03-26 15:29 ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 05/10] list_lru: Add memcg argument to list_lru_from_kmem() Kirill Tkhai
2018-04-02 3:17 ` [lkp-robot] [list_lru] 42658d54ce: BUG:unable_to_handle_kernel kernel test robot
2018-04-02 8:51 ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 06/10] list_lru: Pass dst_memcg argument to memcg_drain_list_lru_node() Kirill Tkhai
2018-03-24 19:32 ` Vladimir Davydov
2018-03-26 15:30 ` Kirill Tkhai
2018-03-28 14:49 ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 07/10] list_lru: Pass lru " Kirill Tkhai
2018-03-21 13:22 ` [PATCH 08/10] mm: Set bit in memcg shrinker bitmap on first list_lru item apearance Kirill Tkhai
2018-03-24 19:45 ` Vladimir Davydov
2018-03-26 15:31 ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 09/10] mm: Iterate only over charged shrinkers during memcg shrink_slab() Kirill Tkhai
2018-03-24 20:11 ` Vladimir Davydov
2018-03-26 15:33 ` Kirill Tkhai
2018-03-21 13:23 ` [PATCH 10/10] mm: Clear shrinker bit if there are no objects related to memcg Kirill Tkhai
2018-03-24 20:33 ` Vladimir Davydov
2018-03-26 15:37 ` Kirill Tkhai
2018-03-21 13:23 ` [PATCH 00/10] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n)) Kirill Tkhai
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