linux-kernel - Re: [RFC PATCH 21/22] perf bpf: probe at kprobe points.

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Date:	Wed, 6 May 2015 10:36:47 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	<ast@...mgrid.com>, <davem@...emloft.net>, <acme@...nel.org>,
	<mingo@...hat.com>, <a.p.zijlstra@...llo.nl>, <jolsa@...nel.org>
CC:	<lizefan@...nel.org>, <linux-kernel@...r.kernel.org>,
	<pi3orama@....com>, <hekuang@...wei.com>
Subject: Re: [RFC PATCH 21/22] perf bpf: probe at kprobe points.

On 2015/5/6 0:34, Masami Hiramatsu wrote:
> At least we need a description what this patch does... what will be
> done with this patch, and what the user will see and what/how they can do.
> 
> Thank you,
> 

Sorry. I manually checked patch commit message after 'git format-patch' but
forgot this one. I'll fix it in the next version.

What this patch do is simply calls 'add_perf_probe_events' (originally used for
perf probe) to create kprobe events. Previous patch has puts all events into a
uniform array.

> On 2015/04/30 19:52, Wang Nan wrote:
>> ---
>>  tools/perf/util/bpf-loader.c | 18 ++++++++++++++++++
>>  1 file changed, 18 insertions(+)
>>
>> diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
>> index 208f5e8..186a3d0 100644
>> --- a/tools/perf/util/bpf-loader.c
>> +++ b/tools/perf/util/bpf-loader.c
>> @@ -952,8 +952,26 @@ out:
>>  	return -1;
>>  }
>>  
>> +static int bpf_probe(void)
>> +{
>> +	int err = add_perf_probe_events(params.event_array,
>> +					params.nr_events,
>> +					MAX_PROBES, 0);
>> +	/* add_perf_probe_events return negative when fail */
>> +	if (err < 0)
>> +		pr_err("bpf probe: failed to probe events\n");
>> +
>> +	return err < 0 ? err : 0;
>> +}
>> +
>>  int bpf__run(void)
>>  {
>> +	int err;
>> +
>> +	pr_debug("bpf: probing\n");
>> +	if ((err = bpf_probe()))
>> +		return err;
>> +
>>  	pr_info("BPF is running. Use Ctrl-c to stop.\n");
>>  	while(1)
>>  		sleep(1);
>>
> 
> 


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