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perf/core: Simplify __detach_global_ctx_data()

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Like in the attach_global_ctx_data() it has a O(N^2) loop to delete task
context data for each thread.  But perf_free_ctx_data_rcu() can be
called under RCU read lock, so just calls it directly rather than
iterating the whole thread list again.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260211223222.3119790-4-namhyung@kernel.org
This commit is contained in:
Namhyung Kim
2026-02-11 14:32:21 -08:00
committed by Peter Zijlstra
parent bec2ee2390
commit da45c8d5f0
1 changed files with 4 additions and 11 deletions
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15
kernel/events/core.c
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@@ -5560,22 +5560,15 @@ static void __detach_global_ctx_data(void)
struct task_struct *g, *p;
struct perf_ctx_data *cd;
again:
scoped_guard (rcu) {
for_each_process_thread(g, p) {
cd = rcu_dereference(p->perf_ctx_data);
if (!cd || !cd->global)
continue;
cd->global = 0;
get_task_struct(p);
goto detach;
if (cd && cd->global) {
cd->global = 0;
detach_task_ctx_data(p);
}
}
}
return;
detach:
detach_task_ctx_data(p);
put_task_struct(p);
goto again;
}
static void detach_global_ctx_data(void)