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| author |   Oleg Nesterov <oleg@redhat.com> | 2020-02-18 16:50:18 +0100 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-03-02 14:06:33 -0700 |
| commit | 6fb614920b38bbf3c1c7fcd944c6d9b5d746103d (patch) | |
| tree | 07e72f16b7e06d68a6cdfc915dcf4289e188f2bf /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | io-wq: use BIT for ulong hash (diff) | |
| download | wireguard-linux-6fb614920b38bbf3c1c7fcd944c6d9b5d746103d.tar.xz wireguard-linux-6fb614920b38bbf3c1c7fcd944c6d9b5d746103d.zip | |
task_work_run: don't take ->pi_lock unconditionally
As Peter pointed out, task_work() can avoid ->pi_lock and cmpxchg()
if task->task_works == NULL && !PF_EXITING.
And in fact the only reason why task_work_run() needs ->pi_lock is
the possible race with task_work_cancel(), we can optimize this code
and make the locking more clear.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions