Subject: Re: perf monitoring triggers Was: Re: [tip:perf/core] perf bench:
 Print both of prefaulted and no prefaulted results by default
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>, mingo@redhat.com,
        hpa@zytor.com, paulus@samba.org, linux-kernel@vger.kernel.org,
        andi@firstfloor.org, yakui.zhao@intel.com, fweisbec@gmail.com,
        ling.ma@intel.com, rostedt@goodmis.org, miaox@cn.fujitsu.com,
        tglx@linutronix.de, mingo@elte.hu
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Date: Mon, 13 Dec 2010 13:40:59 +0100
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On Mon, 2010-12-13 at 10:38 -0200, Arnaldo Carvalho de Melo wrote:
> Em Mon, Dec 13, 2010 at 12:14:33PM +0100, Peter Zijlstra escreveu:
> > On Sun, 2010-12-12 at 11:46 -0200, Arnaldo Carvalho de Melo wrote:
> > > Looks interesting, and also interesting would be to be able to place
> > > probes that would wake up it too, for unmodified binaries to have
> > > something similar.
> 
> > > Other kinds of triggers may be to hook on syscalls and when some
> > > expression matches, like connecting to host 1.2.3.4, start monitoring,
> > > stop when the socket is closed, i.e. monitor a connection lifetime, etc.
>  
> > Sounds to me like you want something like a library with self-monitoring
> > stuff.
> 
> Yeah, that could be a way, an LD_PRELOAD thingy that would intercept
> library calls, setup counters, start a monitoring thread, etc.
> 
> Along the lines of:
> 
> http://git.kernel.org/?p=linux/kernel/git/acme/libautocork.git;a=blob;f=libautocork.c
> 
> This one just intercepts calls, but the __init function could do the
> rest.
> 
> To make it easier we could move the counter setup we have in record/top
> to a library, etc.

Nah, I was more thinking of something along the lines of libPAPI and
libpfmon. A library that contains the needed building blocks for apps to
profile themselves.


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