Re: [PATCH] uprobes: Improve scalability by reducing the contention on siglock

On 08/08, Liao, Chang wrote:

在 2024/8/8 18:28, Oleg Nesterov 写道:

quoted

--- x/kernel/events/uprobes.c
+++ x/kernel/events/uprobes.c

@@ -2308,9 +2308,10 @@ static void handle_singlestep(struct upr
 	utask->state = UTASK_RUNNING;
 	xol_free_insn_slot(current);

-	spin_lock_irq(&current->sighand->siglock);
-	recalc_sigpending(); /* see uprobe_deny_signal() */
-	spin_unlock_irq(&current->sighand->siglock);
+	if (utask->xxx) {
+		set_thread_flag(TIF_SIGPENDING);
+		utask->xxx = 0;
+	}

Agree, if no more discussion about this flag, I will just send v2 today.

Please also resend the previous patch a 1/2, this one as 2/2.

Oleg.