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authorAlexey Gladkov <legion@kernel.org>2021-04-22 14:27:10 +0200
committerEric W. Biederman <ebiederm@xmission.com>2021-04-30 14:14:01 -0500
commitb6c336528926ef73b0f70260f2636de2c3b94c14 (patch)
tree2bf2101c651ec8bb6de80cf738b0cf76a7c40374 /kernel/sys.c
parent905ae01c4ae2ae3df05bb141801b1db4b7d83c61 (diff)
Use atomic_t for ucounts reference counting
The current implementation of the ucounts reference counter requires the use of spin_lock. We're going to use get_ucounts() in more performance critical areas like a handling of RLIMIT_SIGPENDING. Now we need to use spin_lock only if we want to change the hashtable. v10: * Always try to put ucounts in case we cannot increase ucounts->count. This will allow to cover the case when all consumers will return ucounts at once. v9: * Use a negative value to check that the ucounts->count is close to overflow. Signed-off-by: Alexey Gladkov <legion@kernel.org> Link: https://lkml.kernel.org/r/94d1dbecab060a6b116b0a2d1accd8ca1bbb4f5f.1619094428.git.legion@kernel.org Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'kernel/sys.c')
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