linux-kernel - Re: [RFC PATCH v8 47/49] perf tools: Generate prologue for BPF programs

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Date:	Fri, 26 Jun 2015 01:40:08 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Wang Nan <wangnan0@...wei.com>, acme@...nel.org,
	brendan.d.gregg@...il.com, daniel@...earbox.net,
	namhyung@...nel.org, masami.hiramatsu.pt@...achi.com,
	paulus@...ba.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	jolsa@...nel.org, dsahern@...il.com
CC:	linux-kernel@...r.kernel.org, lizefan@...wei.com,
	hekuang@...wei.com, xiakaixu@...wei.com, pi3orama@....com
Subject: Re: [RFC PATCH v8 47/49] perf tools: Generate prologue for BPF programs

On 6/24/15 5:31 AM, Wang Nan wrote:
> This patch generates prologue for each 'struct probe_trace_event' for
> fetching arguments for BPF programs.
>
> After bpf__probe(), iterate over each programs to check whether
> prologue is required. If non of tev have argument, simply skip
> preprocessor hooking. For those who prologue is required, calls
> bpf__gen_prologue() and paste original instruction after prologue.

please don't abbreviate tev, pev in commit logs. It's hard to read
for anyone but core perf experts.

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