linux-kernel - Re: [PATCH] tracing/kprobes: Don't pass addr=ip to perf_trace_buf

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Date:	Thu, 20 Jun 2013 12:54:45 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH] tracing/kprobes: Don't pass addr=ip to perf_trace_buf_submit()

(2013/06/20 5:34), Oleg Nesterov wrote:
> On 06/19, Oleg Nesterov wrote:
>>
>> So. I'll resend this series, will you ack the v2 below?
> 
> Also. Could you please review the new patch I am going to include
> into this series?

It looks OK for me. BTW, IIRC, I had reviewed same one previously...

> 
> This is copy-and-paste of 32520b2c6 which you reviewed and acked.
> 
> And please note that kprobes is the last user of
> perf_trace_buf_submit(addr != 0), we can make some cleanups on top.

Agreed,

> 
> -------------------------------------------------------------------------------
> Subject: [PATCH] tracing/kprobes: Don't pass addr=ip to perf_trace_buf_submit()
> 
> kprobe_perf_func() and kretprobe_perf_func() pass addr=ip to
> perf_trace_buf_submit() for no reason.
> 
> This sets perf_sample_data->addr for PERF_SAMPLE_ADDR, we already
> have perf_sample_data->ip initialized if PERF_SAMPLE_IP.
> 

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Thank you!

> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/trace/trace_kprobe.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 3432652..141c682 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1163,8 +1163,7 @@ kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs)
>  	entry->ip = (unsigned long)tp->rp.kp.addr;
>  	memset(&entry[1], 0, dsize);
>  	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
> -	perf_trace_buf_submit(entry, size, rctx,
> -					entry->ip, 1, regs, head, NULL);
> +	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
>  }
>  
>  /* Kretprobe profile handler */
> @@ -1197,8 +1196,7 @@ kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri,
>  	entry->func = (unsigned long)tp->rp.kp.addr;
>  	entry->ret_ip = (unsigned long)ri->ret_addr;
>  	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
> -	perf_trace_buf_submit(entry, size, rctx,
> -					entry->ret_ip, 1, regs, head, NULL);
> +	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
>  }
>  #endif	/* CONFIG_PERF_EVENTS */
>  
> 


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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