From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751898AbdAWWy4 (ORCPT ); Mon, 23 Jan 2017 17:54:56 -0500 Received: from mail-pf0-f193.google.com ([209.85.192.193]:33960 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751854AbdAWWyy (ORCPT ); Mon, 23 Jan 2017 17:54:54 -0500 Date: Mon, 23 Jan 2017 17:54:49 -0500 From: Tejun Heo To: vdavydov.dev@gmail.com, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org Cc: jsvana@fb.com, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v2 02/10] slub: separate out sysfs_slab_release() from sysfs_slab_remove() Message-ID: <20170123225449.GA29940@htj.duckdns.org> References: <20170117235411.9408-1-tj@kernel.org> <20170117235411.9408-3-tj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170117235411.9408-3-tj@kernel.org> User-Agent: Mutt/1.7.1 (2016-10-04) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>From 3b0cdd93b2d9bdea62ea6681e612bdae7a40d883 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 23 Jan 2017 17:53:18 -0500 Separate out slub sysfs removal and release, and call the former earlier from __kmem_cache_shutdown(). There's no reason to defer sysfs removal through RCU and this will later allow us to remove sysfs files way earlier during memory cgroup offline instead of release. v2: Add slab_state >= FULL test to sysfs_slab_release() so that kobject_put() is skipped for caches which aren't fully initialized as before. This most likely leaks the kmem_cache on init failure as we're skipping the only release path. Let's fix that up later. Signed-off-by: Tejun Heo Cc: Vladimir Davydov Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Andrew Morton --- v2 of the patch. Fixes boot failure reported by the test bot. Thanks. include/linux/slub_def.h | 4 ++-- mm/slab_common.c | 2 +- mm/slub.c | 12 ++++++++++-- 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 75f56c2..07ef550 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -113,9 +113,9 @@ struct kmem_cache { #ifdef CONFIG_SYSFS #define SLAB_SUPPORTS_SYSFS -void sysfs_slab_remove(struct kmem_cache *); +void sysfs_slab_release(struct kmem_cache *); #else -static inline void sysfs_slab_remove(struct kmem_cache *s) +static inline void sysfs_slab_release(struct kmem_cache *s) { } #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index 46ff746..3bc4bb8 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -480,7 +480,7 @@ static void release_caches(struct list_head *release, bool need_rcu_barrier) list_for_each_entry_safe(s, s2, release, list) { #ifdef SLAB_SUPPORTS_SYSFS - sysfs_slab_remove(s); + sysfs_slab_release(s); #else slab_kmem_cache_release(s); #endif diff --git a/mm/slub.c b/mm/slub.c index 68b84f9..59ca718 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -214,11 +214,13 @@ enum track_item { TRACK_ALLOC, TRACK_FREE }; static int sysfs_slab_add(struct kmem_cache *); static int sysfs_slab_alias(struct kmem_cache *, const char *); static void memcg_propagate_slab_attrs(struct kmem_cache *s); +static void sysfs_slab_remove(struct kmem_cache *s); #else static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) { return 0; } static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { } +static inline void sysfs_slab_remove(struct kmem_cache *s) { } #endif static inline void stat(const struct kmem_cache *s, enum stat_item si) @@ -3679,6 +3681,7 @@ int __kmem_cache_shutdown(struct kmem_cache *s) if (n->nr_partial || slabs_node(s, node)) return 1; } + sysfs_slab_remove(s); return 0; } @@ -5629,7 +5632,7 @@ static int sysfs_slab_add(struct kmem_cache *s) goto out; } -void sysfs_slab_remove(struct kmem_cache *s) +static void sysfs_slab_remove(struct kmem_cache *s) { if (slab_state < FULL) /* @@ -5643,7 +5646,12 @@ void sysfs_slab_remove(struct kmem_cache *s) #endif kobject_uevent(&s->kobj, KOBJ_REMOVE); kobject_del(&s->kobj); - kobject_put(&s->kobj); +} + +void sysfs_slab_release(struct kmem_cache *s) +{ + if (slab_state >= FULL) + kobject_put(&s->kobj); } /* -- 2.9.3