diff options
| author | Kinsey Ho <kinseyho@google.com> | 2024-09-05 03:30:53 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-10 02:39:16 +0300 |
| commit | ec0db74b4b1f249ffca4df450f54c17573114045 (patch) | |
| tree | 70c06f61013d633a5de5a2b532c4e7f34597b270 /include/linux | |
| parent | 3d150e31a1f62f0b39bdd8b968f563f8f3915d7a (diff) | |
| download | linux-ec0db74b4b1f249ffca4df450f54c17573114045.tar.xz | |
mm: restart if multiple traversals raced
Currently, if multiple reclaimers raced on the same position, the
reclaimers which detect the race will still reclaim from the same memcg.
Instead, the reclaimers which detect the race should move on to the next
memcg in the hierarchy.
So, in the case where multiple traversals race, jump back to the start of
the mem_cgroup_iter() function to find the next memcg in the hierarchy to
reclaim from.
Link: https://lkml.kernel.org/r/20240905003058.1859929-5-kinseyho@google.com
Reported-by: syzbot+e099d407346c45275ce9@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/000000000000817cf10620e20d33@google.com/
Signed-off-by: Kinsey Ho <kinseyho@google.com>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Yosry Ahmed <yosryahmed@google.com>
Cc: Zefan Li <lizefan.x@bytedance.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/memcontrol.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index fe05fdb92779..2ef94c74847d 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -57,7 +57,7 @@ enum memcg_memory_event { struct mem_cgroup_reclaim_cookie { pg_data_t *pgdat; - unsigned int generation; + int generation; }; #ifdef CONFIG_MEMCG @@ -78,7 +78,7 @@ struct lruvec_stats; struct mem_cgroup_reclaim_iter { struct mem_cgroup *position; /* scan generation, increased every round-trip */ - unsigned int generation; + atomic_t generation; }; /* |