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| author |   Peter Zijlstra <peterz@infradead.org> | 2021-03-09 09:42:09 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2021-03-17 16:33:57 +0100 |
| commit | 697d8c63c4a2991a22a896a5e6adcdbb28fefe56 (patch) | |
| tree | 223efa50042365abc94dcbec5287e94c94773aa0 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | tasklets: Replace spin wait in tasklet_unlock_wait() (diff) | |
| download | linux-dev-697d8c63c4a2991a22a896a5e6adcdbb28fefe56.tar.xz linux-dev-697d8c63c4a2991a22a896a5e6adcdbb28fefe56.zip | |
tasklets: Replace spin wait in tasklet_kill()
tasklet_kill() spin waits for TASKLET_STATE_SCHED to be cleared invoking
yield() from inside the loop. yield() is an ill defined mechanism and the
result might still be wasting CPU cycles in a tight loop which is
especially painful in a guest when the CPU running the tasklet is scheduled
out.
tasklet_kill() is used in teardown paths and not performance critical at
all. Replace the spin wait with wait_var_event().
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309084241.890532921@linutronix.de
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions