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authorQi Zheng <zhengqi.arch@bytedance.com>2023-09-11 12:44:44 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-10-04 20:32:26 +0300
commit8a0e8bb112af28362514624fc46e20426b4bdf1f (patch)
tree4c3ed4ec7a7cb08164540916593c6f25bf248449 /mm/shrinker.c
parent604b8b655020816b66ae474681d1100c5c0ba8c4 (diff)
downloadlinux-8a0e8bb112af28362514624fc46e20426b4bdf1f.tar.xz
mm: shrinker: convert shrinker_rwsem to mutex
Now there are no readers of shrinker_rwsem, so we can simply replace it with mutex lock. [akpm@linux-foundation.org: update the fix to alloc_shrinker_info()] Link: https://lkml.kernel.org/r/20230911094444.68966-46-zhengqi.arch@bytedance.com Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Cc: Abhinav Kumar <quic_abhinavk@quicinc.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Anna Schumaker <anna@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Bob Peterson <rpeterso@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Carlos Llamas <cmllamas@google.com> Cc: Chandan Babu R <chandan.babu@oracle.com> Cc: Chao Yu <chao@kernel.org> Cc: Chris Mason <clm@fb.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Christian Koenig <christian.koenig@amd.com> Cc: Chuck Lever <cel@kernel.org> Cc: Coly Li <colyli@suse.de> Cc: Dai Ngo <Dai.Ngo@oracle.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: "Darrick J. Wong" <djwong@kernel.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Airlie <airlied@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Sterba <dsterba@suse.com> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Cc: Gao Xiang <hsiangkao@linux.alibaba.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Huang Rui <ray.huang@amd.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Jan Kara <jack@suse.cz> Cc: Jason Wang <jasowang@redhat.com> Cc: Jeff Layton <jlayton@kernel.org> Cc: Jeffle Xu <jefflexu@linux.alibaba.com> Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Josef Bacik <josef@toxicpanda.com> Cc: Juergen Gross <jgross@suse.com> Cc: Kent Overstreet <kent.overstreet@gmail.com> Cc: Kirill Tkhai <tkhai@ya.ru> Cc: Marijn Suijten <marijn.suijten@somainline.org> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Mike Snitzer <snitzer@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nadav Amit <namit@vmware.com> Cc: Neil Brown <neilb@suse.de> Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Cc: Olga Kornievskaia <kolga@netapp.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rob Clark <robdclark@gmail.com> Cc: Rob Herring <robh@kernel.org> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Sean Paul <sean@poorly.run> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Song Liu <song@kernel.org> Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: Steven Price <steven.price@arm.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com> Cc: Tom Talpey <tom@talpey.com> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Cc: Yue Hu <huyue2@coolpad.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/shrinker.c')
-rw-r--r--mm/shrinker.c30
1 files changed, 15 insertions, 15 deletions
diff --git a/mm/shrinker.c b/mm/shrinker.c
index ef22f20a97cb..dd91eab43ed3 100644
--- a/mm/shrinker.c
+++ b/mm/shrinker.c
@@ -8,7 +8,7 @@
#include "internal.h"
LIST_HEAD(shrinker_list);
-DECLARE_RWSEM(shrinker_rwsem);
+DEFINE_MUTEX(shrinker_mutex);
#ifdef CONFIG_MEMCG
static int shrinker_nr_max;
@@ -80,7 +80,7 @@ int alloc_shrinker_info(struct mem_cgroup *memcg)
int nid, ret = 0;
int array_size = 0;
- down_write(&shrinker_rwsem);
+ mutex_lock(&shrinker_mutex);
array_size = shrinker_unit_size(shrinker_nr_max);
for_each_node(nid) {
info = kvzalloc_node(sizeof(*info) + array_size, GFP_KERNEL, nid);
@@ -91,12 +91,12 @@ int alloc_shrinker_info(struct mem_cgroup *memcg)
goto err;
rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_info, info);
}
- up_write(&shrinker_rwsem);
+ mutex_unlock(&shrinker_mutex);
return ret;
err:
- up_write(&shrinker_rwsem);
+ mutex_unlock(&shrinker_mutex);
free_shrinker_info(memcg);
return -ENOMEM;
}
@@ -105,7 +105,7 @@ static struct shrinker_info *shrinker_info_protected(struct mem_cgroup *memcg,
int nid)
{
return rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_info,
- lockdep_is_held(&shrinker_rwsem));
+ lockdep_is_held(&shrinker_mutex));
}
static int expand_one_shrinker_info(struct mem_cgroup *memcg, int new_size,
@@ -155,7 +155,7 @@ static int expand_shrinker_info(int new_id)
if (!root_mem_cgroup)
goto out;
- lockdep_assert_held(&shrinker_rwsem);
+ lockdep_assert_held(&shrinker_mutex);
new_size = shrinker_unit_size(new_nr_max);
old_size = shrinker_unit_size(shrinker_nr_max);
@@ -218,7 +218,7 @@ static int shrinker_memcg_alloc(struct shrinker *shrinker)
if (mem_cgroup_disabled())
return -ENOSYS;
- down_write(&shrinker_rwsem);
+ mutex_lock(&shrinker_mutex);
id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
if (id < 0)
goto unlock;
@@ -232,7 +232,7 @@ static int shrinker_memcg_alloc(struct shrinker *shrinker)
shrinker->id = id;
ret = 0;
unlock:
- up_write(&shrinker_rwsem);
+ mutex_unlock(&shrinker_mutex);
return ret;
}
@@ -242,7 +242,7 @@ static void shrinker_memcg_remove(struct shrinker *shrinker)
BUG_ON(id < 0);
- lockdep_assert_held(&shrinker_rwsem);
+ lockdep_assert_held(&shrinker_mutex);
idr_remove(&shrinker_idr, id);
}
@@ -293,7 +293,7 @@ void reparent_shrinker_deferred(struct mem_cgroup *memcg)
parent = root_mem_cgroup;
/* Prevent from concurrent shrinker_info expand */
- down_write(&shrinker_rwsem);
+ mutex_lock(&shrinker_mutex);
for_each_node(nid) {
child_info = shrinker_info_protected(memcg, nid);
parent_info = shrinker_info_protected(parent, nid);
@@ -306,7 +306,7 @@ void reparent_shrinker_deferred(struct mem_cgroup *memcg)
}
}
}
- up_write(&shrinker_rwsem);
+ mutex_unlock(&shrinker_mutex);
}
#else
static int shrinker_memcg_alloc(struct shrinker *shrinker)
@@ -740,11 +740,11 @@ void shrinker_register(struct shrinker *shrinker)
return;
}
- down_write(&shrinker_rwsem);
+ mutex_lock(&shrinker_mutex);
list_add_tail_rcu(&shrinker->list, &shrinker_list);
shrinker->flags |= SHRINKER_REGISTERED;
shrinker_debugfs_add(shrinker);
- up_write(&shrinker_rwsem);
+ mutex_unlock(&shrinker_mutex);
init_completion(&shrinker->done);
/*
@@ -784,7 +784,7 @@ void shrinker_free(struct shrinker *shrinker)
wait_for_completion(&shrinker->done);
}
- down_write(&shrinker_rwsem);
+ mutex_lock(&shrinker_mutex);
if (shrinker->flags & SHRINKER_REGISTERED) {
/*
* Now we can safely remove it from the shrinker_list and then
@@ -799,7 +799,7 @@ void shrinker_free(struct shrinker *shrinker)
if (shrinker->flags & SHRINKER_MEMCG_AWARE)
shrinker_memcg_remove(shrinker);
- up_write(&shrinker_rwsem);
+ mutex_unlock(&shrinker_mutex);
if (debugfs_entry)
shrinker_debugfs_remove(debugfs_entry, debugfs_id);