From: David Ahern <dsahern@gmail.com>
To: Yunlong Song <yunlong.song@huawei.com>,
a.p.zijlstra@chello.nl, paulus@samba.org, mingo@redhat.com,
Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: linux-kernel@vger.kernel.org, wangnan0@huawei.com
Subject: Re: [Question] How does perf still record the stack of a specified pid even when that process is interrupted and CPU is scheduled to other process
Date: Fri, 24 Apr 2015 07:49:48 -0600 [thread overview]
Message-ID: <553A49FC.9010002@gmail.com> (raw)
In-Reply-To: <553A45CA.8020808@huawei.com>
On 4/24/15 7:31 AM, Yunlong Song wrote:
> [Profiling Problem]
>
> Although perf can record the events (with call stack) of a specified pid, e.g. using
> "perf record -g iozone -s 262144 -r 64 -i 0 -i 2". But we find iozone is interrupted
That command tells perf to *only* collect data for iozone. This command:
perf record -g -a -- iozone ....
tells perf to collect samples system wide as long as the iozone process
is alive.
next prev parent reply other threads:[~2015-04-24 13:49 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-24 13:31 [Question] How does perf still record the stack of a specified pid even when that process is interrupted and CPU is scheduled to other process Yunlong Song
2015-04-24 13:49 ` Yunlong Song
2015-04-25 14:03 ` Yunlong Song
2015-04-24 13:49 ` David Ahern [this message]
2015-04-24 13:56 ` Yunlong Song
2015-04-24 13:58 ` David Ahern
2015-04-25 14:05 ` Yunlong Song
2015-04-25 15:53 ` David Ahern
2015-05-05 21:53 ` Rabin Vincent
2015-05-05 22:24 ` David Ahern
2015-05-06 4:13 ` Yunlong Song
2015-05-06 4:10 ` Yunlong Song
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