linux

Files

Peter Zijlstra b168098912 perf: Optimize perf_pmu_migrate_context()

Thomas reported that offlining CPUs spends a lot of time in
synchronize_rcu() as called from perf_pmu_migrate_context() even though
he's not actually using uncore events.

Turns out, the thing is unconditionally waiting for RCU, even if there's
no actual events to migrate.

Fixes: 0cda4c0231 ("perf: Introduce perf_pmu_migrate_context()")
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lkml.kernel.org/r/20230403090858.GT4253@hirez.programming.kicks-ass.net

2023-04-05 09:58:46 +02:00

callchain.c

uaccess: remove CONFIG_SET_FS

2022-02-25 09:36:06 +01:00

core.c

perf: Optimize perf_pmu_migrate_context()

2023-04-05 09:58:46 +02:00

hw_breakpoint_test.c

perf/hw_breakpoint: test: Skip the test if dependencies unmet

2022-11-02 12:22:05 +01:00

hw_breakpoint.c

perf/hw_breakpoint: Annotate tsk->perf_event_mutex vs ctx->mutex