diff options
author | Qi Zheng <zhengqi.arch@bytedance.com> | 2023-09-11 12:44:26 +0300 |
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committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-04 20:32:25 +0300 |
commit | 17c4eb036a37f079ce2857be5914f839623b4eb2 (patch) | |
tree | 8c7b66cf191837d1f7ec000379065647142962a3 /drivers/misc/vmw_balloon.c | |
parent | a6a1eb6214cf7adfd1e2da33d819df17fe8a64d7 (diff) | |
download | linux-17c4eb036a37f079ce2857be5914f839623b4eb2.tar.xz |
vmw_balloon: dynamically allocate the vmw-balloon shrinker
In preparation for implementing lockless slab shrink, use new APIs to
dynamically allocate the vmw-balloon shrinker, so that it can be freed
asynchronously via RCU. Then it doesn't need to wait for RCU read-side
critical section when releasing the struct vmballoon.
And we can simply exit vmballoon_init() when registering the shrinker
fails. So the shrinker_registered indication is redundant, just remove it.
Link: https://lkml.kernel.org/r/20230911094444.68966-28-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Nadav Amit <namit@vmware.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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: 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: 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: Muchun Song <muchun.song@linux.dev>
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 'drivers/misc/vmw_balloon.c')
-rw-r--r-- | drivers/misc/vmw_balloon.c | 38 |
1 files changed, 12 insertions, 26 deletions
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 9ce9b9e0e9b6..c817d8c21641 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -380,16 +380,7 @@ struct vmballoon { /** * @shrinker: shrinker interface that is used to avoid over-inflation. */ - struct shrinker shrinker; - - /** - * @shrinker_registered: whether the shrinker was registered. - * - * The shrinker interface does not handle gracefully the removal of - * shrinker that was not registered before. This indication allows to - * simplify the unregistration process. - */ - bool shrinker_registered; + struct shrinker *shrinker; }; static struct vmballoon balloon; @@ -1568,29 +1559,27 @@ static unsigned long vmballoon_shrinker_count(struct shrinker *shrinker, static void vmballoon_unregister_shrinker(struct vmballoon *b) { - if (b->shrinker_registered) - unregister_shrinker(&b->shrinker); - b->shrinker_registered = false; + shrinker_free(b->shrinker); + b->shrinker = NULL; } static int vmballoon_register_shrinker(struct vmballoon *b) { - int r; - /* Do nothing if the shrinker is not enabled */ if (!vmwballoon_shrinker_enable) return 0; - b->shrinker.scan_objects = vmballoon_shrinker_scan; - b->shrinker.count_objects = vmballoon_shrinker_count; - b->shrinker.seeks = DEFAULT_SEEKS; + b->shrinker = shrinker_alloc(0, "vmw-balloon"); + if (!b->shrinker) + return -ENOMEM; - r = register_shrinker(&b->shrinker, "vmw-balloon"); + b->shrinker->scan_objects = vmballoon_shrinker_scan; + b->shrinker->count_objects = vmballoon_shrinker_count; + b->shrinker->private_data = b; - if (r == 0) - b->shrinker_registered = true; + shrinker_register(b->shrinker); - return r; + return 0; } /* @@ -1883,7 +1872,7 @@ static int __init vmballoon_init(void) error = vmballoon_register_shrinker(&balloon); if (error) - goto fail; + return error; /* * Initialization of compaction must be done after the call to @@ -1905,9 +1894,6 @@ static int __init vmballoon_init(void) vmballoon_debugfs_init(&balloon); return 0; -fail: - vmballoon_unregister_shrinker(&balloon); - return error; } /* |