linux-kernel - Re: [tip:perfcounters/core] perf_counter: kerneltop: update to new ABI

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Date:	Thu, 2 Apr 2009 20:28:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf_counter: kerneltop: update to new
	ABI


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

> On Thu, 2009-04-02 at 20:11 +0200, Ingo Molnar wrote:
> > * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> > 
> > > On Thu, 2009-04-02 at 19:05 +0530, Jaswinder Singh Rajput wrote:
> > > > On Thu, 2009-04-02 at 12:03 +0000, Peter Zijlstra wrote:
> > > > > Commit-ID:  373b153677f26a263ef297d77a5e045a31f6486c
> > > > > Gitweb:     http://git.kernel.org/tip/373b153677f26a263ef297d77a5e045a31f6486c
> > > > > Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > > > AuthorDate: Thu, 2 Apr 2009 11:12:02 +0200
> > > > > Committer:  Ingo Molnar <mingo@...e.hu>
> > > > > CommitDate: Thu, 2 Apr 2009 13:53:00 +0200
> > > > > 
> > > > > perf_counter: kerneltop: update to new ABI
> > > > > 
> > > > > Update to reflect the new record_type ABI changes.
> > > > > 
> > > > 
> > > > perfstat is still having many issues:
> > > > 
> > > > 1. 0:6: bus-cycles is not valid for AMD, so it fails
> > > > 
> > > > 2. ./perfstat -e 0:1,0:2,0:3,0:4,0:5,0:6 ls
> > > > can be replaced by ./perfstat -e 0:* ls
> > > > 
> > > > 3. Similarly ./perfstat -e 1:1,1:2,1:3,1:4,1:5,1:6 ls
> > > > can be replaced by ./perfstat -e 1:* ls
> > > > 
> > > > 4. All events can be replaced by ./perfstat -e * ls
> > > > 
> > > 
> > > 5. This command is invalid:
> > >   Sample output:
> > > 
> > >    $ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
> > 
> > yes, this should be fixed in perfstat: '-e 1' should be accepted as 
> > '-e 0:1'. Patches welcome.
> > 
> 
> if you treat '-e 1' as 'e 0:1' then how you will treat '-e 1:1' ?
>
> I think 'e 1:*' is better option to select all software events and 
> '-e 0:*' for all hardware events.

That is not what i suggested though. I suggested '-e 1' to mean to 
default to the more common case: hw counters. I.e.:

 -e 1    ==    -e 0:1
 -e 2    ==    -e 0:2
 -e 3    ==    -e 0:3
 ...

sw counters could be specified only via the longer form.

Anyway, most people will use symbolic names anyway (-e cycles, 
etc.), so i suspect the issue is mostly irrelevant.

	Ingo
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