diff mbox series

[v3,1/2] uprobes: Remove redundant spinlock in uprobe_deny_signal()

Message ID 20240815014629.2685155-2-liaochang1@huawei.com (mailing list archive)
State New
Headers show
Series uprobes: Improve scalability by reducing the contention on siglock | expand

Commit Message

Liao, Chang Aug. 15, 2024, 1:46 a.m. UTC 
Since clearing a bit in thread_info is an atomic operation, the spinlock
is redundant and can be removed, reducing lock contention is good for
performance.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Liao Chang <liaochang1@huawei.com>
---
 kernel/events/uprobes.c | 2 --
 1 file changed, 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 73cc47708679..76a51a1f51e2 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1979,9 +1979,7 @@  bool uprobe_deny_signal(void)
 	WARN_ON_ONCE(utask->state != UTASK_SSTEP);
 
 	if (task_sigpending(t)) {
-		spin_lock_irq(&t->sighand->siglock);
 		clear_tsk_thread_flag(t, TIF_SIGPENDING);
-		spin_unlock_irq(&t->sighand->siglock);
 
 		if (__fatal_signal_pending(t) || arch_uprobe_xol_was_trapped(t)) {
 			utask->state = UTASK_SSTEP_TRAPPED;