[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240807115550.138301094@infradead.org>
Date: Wed, 07 Aug 2024 13:29:27 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: mingo@...nel.org
Cc: peterz@...radead.org,
acme@...nel.org,
namhyung@...nel.org,
mark.rutland@....com,
alexander.shishkin@...ux.intel.com,
jolsa@...nel.org,
irogers@...gle.com,
adrian.hunter@...el.com,
kan.liang@...ux.intel.com,
linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] perf: Fix event_function_call() locking
All the event_function/@...c call context already uses perf_ctx_lock()
except for the !ctx->is_active case. Make it all consistent.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
kernel/events/core.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -263,6 +263,7 @@ static int event_function(void *info)
static void event_function_call(struct perf_event *event, event_f func, void *data)
{
struct perf_event_context *ctx = event->ctx;
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context);
struct task_struct *task = READ_ONCE(ctx->task); /* verified in event_function */
struct event_function_struct efs = {
.event = event,
@@ -291,22 +292,22 @@ static void event_function_call(struct p
if (!task_function_call(task, event_function, &efs))
return;
- raw_spin_lock_irq(&ctx->lock);
+ perf_ctx_lock(cpuctx, ctx);
/*
* Reload the task pointer, it might have been changed by
* a concurrent perf_event_context_sched_out().
*/
task = ctx->task;
if (task == TASK_TOMBSTONE) {
- raw_spin_unlock_irq(&ctx->lock);
+ perf_ctx_unlock(cpuctx, ctx);
return;
}
if (ctx->is_active) {
- raw_spin_unlock_irq(&ctx->lock);
+ perf_ctx_unlock(cpuctx, ctx);
goto again;
}
func(event, NULL, ctx, data);
- raw_spin_unlock_irq(&ctx->lock);
+ perf_ctx_unlock(cpuctx, ctx);
}
/*
Powered by blists - more mailing lists