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| author | Waiman Long <longman@redhat.com> | 2022-06-15 00:03:59 +0200 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-06-17 04:48:32 +0200 |
| commit | 6edda04ccc7cfb281d139e352dbd5dd933bd2751 (patch) | |
| tree | b2636bc590cb869ec6ad0ff59daabf2693b8bdc6 /net/sched/sch_netem.c | |
| parent | mm/kmemleak: skip unlikely objects in kmemleak_scan() without taking lock (diff) | |
| download | linux-6edda04ccc7cfb281d139e352dbd5dd933bd2751.tar.xz linux-6edda04ccc7cfb281d139e352dbd5dd933bd2751.zip | |
mm/kmemleak: prevent soft lockup in first object iteration loop of kmemleak_scan()
The first RCU-based object iteration loop has to modify the object count.
So we cannot skip taking the object lock.
One way to avoid soft lockup is to insert occasional cond_resched() call
into the loop. This cannot be done while holding the RCU read lock which
is to protect objects from being freed. However, taking a reference to
the object will prevent it from being freed. We can then do a
cond_resched() call after every 64k objects safely.
Link: https://lkml.kernel.org/r/20220614220359.59282-4-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'net/sched/sch_netem.c')
0 files changed, 0 insertions, 0 deletions