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Date: Tue, 15 Nov 2016 12:32:18 +0800
From: "Wangnan (F)" <wangnan0@...wei.com>
To: <acme@...hat.com>, <ast@...com>
CC: <lizefan@...wei.com>, <hekuang@...wei.com>,
<linux-kernel@...r.kernel.org>, <pi3orama@....com>,
Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH 00/34] perf clang: Builtin clang and perfhook support
On 2016/11/15 12:05, Wang Nan wrote:
> $ sudo -s
> # ulimit -l unlimited
> # perf record -e ./count_syscalls.c echo "Haha"
> Start count, perfpid=25209
> Haha
> [ perf record: Woken up 1 times to write data ]
> syscall 8 count: 6
> syscall 11 count: 1
> syscall 4 count: 6
> syscall 21 count: 1
> syscall 5 count: 3
> syscall 231 count: 1
> syscall 45 count: 3
> syscall 0 count: 24
> syscall 257 count: 1
> syscall 59 count: 4
> syscall 23 count: 9
> syscall 78 count: 2
> syscall 41 count: 4
> syscall 72 count: 8
> syscall 10 count: 3
> syscall 321 count: 1
> syscall 298 count: 7
> syscall 16 count: 21
> syscall 9 count: 16
> syscall 1 count: 114
> syscall 12 count: 3
> syscall 14 count: 35
> syscall 158 count: 1
> syscall 2 count: 15
> syscall 7 count: 18
> syscall 3 count: 11
> [ perf record: Captured and wrote 0.011 MB perf.data ]
Note that this example counts system wide syscall histogram, not
only 'echo' proc. The in-kernel BPF script doesn't know pid of 'echo'
so can't filter base on it. I'm planning adding more perf hook points
to pass information like this.
Thank you.
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