linux-kernel - Re: perf eBPF patch ordering. was: Re: perf test LLVM was: Re: [GIT PULL 00/39] perf tools: filtering events using eBPF programs

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Message-ID: <55C0966B.5020801@huawei.com>
Date:	Tue, 4 Aug 2015 18:39:39 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	pi3orama <pi3orama@....com>
CC:	He Kuang <hekuang@...wei.com>, Li Zefan <lizefan@...wei.com>,
	"Alexei Starovoitov" <ast@...mgrid.com>,
	Xia Kaixu <xiakaixu@...wei.com>,
	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: perf eBPF patch ordering.  was: Re: perf test LLVM was: Re: [GIT
 PULL 00/39] perf tools: filtering events using eBPF programs



On 2015/8/4 13:28, Wangnan (F) wrote:
> Hi Arnaldo,
>
> The following changes since commit 
> 922cc21746202956acb41c89a6190bb50805fa31:
>
>   perf tools: Introduce llvm config options (2015-07-31 12:17:50 -0300)
>
> are available in the git repository at:
>
>   https://github.com/WangNan0/linux.git ebpf
>
> for you to fetch changes up to d85bf4b6470b8d860bbae25418e5ae3ccd9711e8:
>
>   perf tools: Support attach BPF program on uprobe events (2015-08-04 
> 04:59:20 +0000)
>
> ----------------------------------------------------------------
>
> The new cset has following improvements:
>
> 1. Improve error message: now don't dump LLVM environment setting 
> messages
>    if clang is found. Also, describe how to pre-compile .c file into .o.
>
>    See: perf tools: Call clang to compile C source to object code
> https://github.com/WangNan0/linux/commit/264676a5b922aaf1e9be3800fe06d5b67b06cd12 
>
>
> 2. Reorder patches, so when 'perf record' is able to accept '--event 
> file.c', the BPF filter
>    should work. Also, an example BPF script file is provided, and the 
> compilation
>    method is described in commit message.
>
>    See:
>         perf tools: Infrastructure for compiling scriptlets when 
> passing '.c' to --event
> https://github.com/WangNan0/linux/commit/eca622f4a88e1a791fc2405c398256ad572eba54 
>
>
> 3. Introduce 'perf test BPF', which uses previous introduced 
> scriptlet, fork a
>    'perf record' to utilise it and uses 'perf report' to check the 
> result.
>
>    See: perf tests: Enforce LLVM test for BPF test
> https://github.com/WangNan0/linux/commit/a7cdab453863c580446dc2c3a3f3a86f21b770ce 
>
>
>         perf test: Enable 'perf test' run as test targets
> https://github.com/WangNan0/linux/commit/b14f2627e95d348be5ec19bd24a5117e8c2ffe46 
>
>     and
>         perf test: Add 'perf test BPF'
> https://github.com/WangNan0/linux/commit/8414217dbfa57df4dbb55642dc26205e1c7cbdf1 
>

Just realized that 'tempnam' is not safe. Switch to mkdtemp. Please see 
the new version:

https://github.com/WangNan0/linux/commit/bd02aed760c4a35fec4483d24c158799f05f6f9e

and pull request update:

The following changes since commit 922cc21746202956acb41c89a6190bb50805fa31:

   perf tools: Introduce llvm config options (2015-07-31 12:17:50 -0300)

are available in the git repository at:

   https://github.com/WangNan0/linux.git ebpf

for you to fetch changes up to 47ef1d2a64bd0e7931835e1c40caed21f793c8b8:

   perf tools: Support attach BPF program on uprobe events (2015-08-04 
10:30:50 +0000)

Thank you.



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