Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

[Frederik Deweerdt]

On Sat, Sep 16, 2006 at 09:37:45PM +0200, Ingo Molnar wrote:
> --------------->
> Subject: [patch] kprobes: speed INT3 trap handling up on i386
> From: Ingo Molnar <mingo@xxxxxxx>
> 
> speed up kprobes trap handling by special-casing kernel-space
> INT3 traps (which do not occur otherwise) and doing a kprobes
> handler check - instead of redirecting over the i386-die-notifier
> chain.
> 
Hi Ingo,

Not that it would make any difference to the actual kprobe performance,
but I think that not using the die-notifier chain makes the DIE_INT3
handling in kprobe_exceptions_notify() useless.

Regards,
Frederik


Signed-off-by: Frederik Deweerdt <frederik.deweerdt@xxxxxxxxx>

diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
index afe6505..90787ff 100644
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -652,10 +652,6 @@ int __kprobes kprobe_exceptions_notify(s
 		return ret;
 
 	switch (val) {
-	case DIE_INT3:
-		if (kprobe_handler(args->regs))
-			ret = NOTIFY_STOP;
-		break;
 	case DIE_DEBUG:
 		if (post_kprobe_handler(args->regs))
 			ret = NOTIFY_STOP;
-
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