Re: [patch] kprobes: optimize branch placement

On Sat, 16 Sep 2006 22:29:39 +0200
Ingo Molnar <[email protected]> wrote:

> --- linux.orig/arch/i386/kernel/kprobes.c
> +++ linux/arch/i386/kernel/kprobes.c
> @@ -220,7 +220,7 @@ int __kprobes kprobe_handler(struct pt_r
>  	kcb = get_kprobe_ctlblk();
>  
>  	/* Check we're not actually recursing */
> -	if (kprobe_running()) {
> +	if (unlikely(kprobe_running())) {
>  		p = get_kprobe(addr);

This function does two calls to get_kprobe() (in the recurring-trap case)
where only one is needed.
-
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---

• References:
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Roman Zippel <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Mathieu Desnoyers <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Jes Sorensen <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Mathieu Desnoyers <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Mathieu Desnoyers <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
    • From: Ingo Molnar <[email protected]>
  • [patch] kprobes: optimize branch placement
    • From: Ingo Molnar <[email protected]>

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