The patch titled
Subject: mm: assign id to every memcg-aware shrinker
has been added to the -mm tree. Its filename is
mm-assign-id-to-every-memcg-aware-shrinker.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-assign-id-to-every-memcg-aware-shrinker.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-assign-id-to-every-memcg-aware-shrinker.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Subject: mm: assign id to every memcg-aware shrinker
Introduce 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 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.
Link: http://lkml.kernel.org/r/153063054586.1818.6041047871606697364.stgit@localhost.localdomain
Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Acked-by: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Tested-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Josef Bacik <jbacik@xxxxxx>
Cc: Li RongQing <lirongqing@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Philippe Ombredanne <pombredanne@xxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/shrinker.h | 4 ++
mm/vmscan.c | 62 +++++++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)
diff -puN include/linux/shrinker.h~mm-assign-id-to-every-memcg-aware-shrinker include/linux/shrinker.h
--- a/include/linux/shrinker.h~mm-assign-id-to-every-memcg-aware-shrinker
+++ a/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 -puN mm/vmscan.c~mm-assign-id-to-every-memcg-aware-shrinker mm/vmscan.c
--- a/mm/vmscan.c~mm-assign-id-to-every-memcg-aware-shrinker
+++ a/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 *s
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
{
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);
_
Patches currently in -mm which might be from ktkhai@xxxxxxxxxxxxx are
memcg-remove-memcg_cgroup-id-from-idr-on-mem_cgroup_css_alloc-failure.patch
list_lru-combine-code-under-the-same-define.patch
mm-introduce-config_memcg_kmem-as-combination-of-config_memcg-config_slob.patch
mm-assign-id-to-every-memcg-aware-shrinker.patch
memcg-move-up-for_each_mem_cgroup-_tree-defines.patch
mm-assign-memcg-aware-shrinkers-bitmap-to-memcg.patch
mm-refactoring-in-workingset_init.patch
fs-refactoring-in-alloc_super.patch
fs-propagate-shrinker-id-to-list_lru.patch
list_lru-add-memcg-argument-to-list_lru_from_kmem.patch
list_lru-pass-dst_memcg-argument-to-memcg_drain_list_lru_node.patch
list_lru-pass-lru-argument-to-memcg_drain_list_lru_node.patch
mm-export-mem_cgroup_is_root.patch
mm-set-bit-in-memcg-shrinker-bitmap-on-first-list_lru-item-apearance.patch
mm-iterate-only-over-charged-shrinkers-during-memcg-shrink_slab.patch
mm-add-shrink_empty-shrinker-methods-return-value.patch
mm-clear-shrinker-bit-if-there-are-no-objects-related-to-memcg.patch
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