linux-kernel - Re: [PATCH 6/6] uprobes/perf: Always increment trace

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Date:	Mon, 04 Feb 2013 11:34:53 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ingo Molnar <mingo@...e.hu>, Anton Arapov <anton@...hat.com>,
	Frank Eigler <fche@...hat.com>,
	Josh Stone <jistone@...hat.com>,
	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] uprobes/perf: Always increment trace_uprobe->nhit

On Mon, 2013-02-04 at 21:56 +0530, Srikar Dronamraju wrote:
> * Oleg Nesterov <oleg@...hat.com> [2013-02-04 16:18:50]:
> 
> > On 02/04, Srikar Dronamraju wrote:
> > >
> > > * Oleg Nesterov <oleg@...hat.com> [2013-01-31 20:18:32]:
> > >
> > > > Move tu->nhit++ from uprobe_trace_func() to uprobe_dispatcher().
> > > >
> > > > ->nhit counts how many time we hit the breakpoint inserted by this
> > > > uprobe, we do not want to loose this info if uprobe was enabled by
> > > > sys_perf_event_open().
> > > >
> > >
> > > Though I dont see a problem with this change, It seems unnecessary for
> > > me.
> > >
> > > Info from nhits is mostly for /sys/kernel/debug/tracing/uprobe_profile
> > 
> > It is only for uprobe_profile, yes, and it is useful. Why should we hide
> > this info if this uprobe is used by perf?
> 
> Fine with me.
> 
> Steve, Masami, Do you have comments/suggestions on this. 

I have no problem with the change.

> (Since kprobe_profile just accounts for kprobetracer and doesnt account
> for perf record.)
> May we should make a similar change in kprobetracer to keep things
> similar.

I'm fine either way.

-- Steve


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