linux-kernel - Re: [PATCH RFC V5 2/4] perf,tool: per-event time support

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Message-ID: <20150721145615.GB21171@krava.brq.redhat.com>
Date:	Tue, 21 Jul 2015 16:56:15 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	"Liang, Kan" <kan.liang@...el.com>,
	"acme@...nel.org" <acme@...nel.org>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC V5 2/4] perf,tool: per-event time support

On Tue, Jul 21, 2015 at 11:45:01PM +0900, Namhyung Kim wrote:

SNIP

> > > 
> > > [jolsa@...va perf]$ ./perf record -e 'cpu/instructions,period=20000/' -c
> > > 1000 sleep 1 [ perf record: Woken up 1 times to write data ] /proc/kcore
> > > requires CAP_SYS_RAWIO capability to access.
> > > [ perf record: Captured and wrote 0.015 MB perf.data (35 samples) ]
> > > [jolsa@...va perf]$ ./perf evlist -vv
> > > cpu/instructions,period=20000/: type: 4, size: 112, config: 0xc0,
> > > { sample_period, sample_freq }: 20000
> > > 
> > 
> > So you are going to change current behavior?
> > The current behavior is "global opts setting" > "per_event settring" > default
> > You are going to change it to "per_event settring" > "global opts setting" >
> > Default. Right?
> 
> Hmm.. I agree that changing current behavior is not good.  But I think
> it makes more sense to prefer per-event settings over global settings
> in general.

hum right.. but it's just period ATM that will be affected..
I'd risk it, since I dont think maybe people actualy used it ;-)

together with time term, which wasn't possible to change before
anyway, so there should be no problem

jirka
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