From: Rick Jones <rick.jones2@hp.com>
To: AKel <ankelly006@hotmail.com>, linux-perf-users@vger.kernel.org
Subject: Re: Using perf to generate a call stack from a kernel function to the user space caller
Date: Tue, 20 Jan 2015 10:40:17 -0800 [thread overview]
Message-ID: <54BEA111.9060504@hp.com> (raw)
In-Reply-To: <loom.20150120T180008-930@post.gmane.org>
On 01/20/2015 09:08 AM, AKel wrote:
> Hi,
>
> I'm trying to profile an application which is spending quite a bit of time
> in the kernel (~40% in do_raw_spin_lock for example). To fully understand
> what is happening I would like to generate a call stack using perf (or
> otherwise) to see where the calls to this function are originating from.
> Is this possible? My hands are slightly tied in that I don't have sudo
> access to the system I'm working on, so a solution which accounts for this
> would be greatly appreciated. Even transferring files to/from the system
> is very difficult so I'm rather restricted in what i can do.
I suspect you will have to resolve the sudo issue by getting sudo.
Ignoring that for the time-being, it sounds like you could use the
call-graph functionality of perf record/report/top?
rick jones
next prev parent reply other threads:[~2015-01-20 18:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-20 17:08 Using perf to generate a call stack from a kernel function to the user space caller AKel
2015-01-20 18:40 ` Rick Jones [this message]
2015-01-21 9:42 ` AKel
2015-01-21 12:40 ` Arnaldo Carvalho de Melo
2015-01-21 14:56 ` Arnaldo Carvalho de Melo
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