lkml.org 
[lkml]   [2020]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] perf tools: add support for lipfm4
On Tue, Mar 10, 2020 at 02:39:23PM -0700, Stephane Eranian wrote:
> On Tue, Mar 10, 2020 at 12:59 PM Andi Kleen <ak@linux.intel.com> wrote:
> >
> > On Tue, Mar 10, 2020 at 11:50:03AM -0700, Ian Rogers wrote:
> > > This patch links perf with the libpfm4 library.
> > > This library contains all the hardware event tables for all
> > > processors supported by perf_events. This is a helper library
> > > that help convert from a symbolic event name to the event
> > > encoding required by the underlying kernel interface. This
> > > library is open-source and available from: http://perfmon2.sf.net.
> >
> > For most CPUs the builtin perf JSON event support should make
> > this redundant.
> >
> We decided to post this patch to propose an alternative to the JSON
> file approach. It could be an option during the build.
> The libpfm4 library has been around for 15 years now. Therefore, it
> supports a lot of processors core and uncore and it is very portable.
> The key value add I see is that this is a library that can be, and has
> been, used by tool developers directly in their apps. It can
> work with more than Linux perf_events interface. It is not tied to the
> interface. It has well defined and documented entry points.
> We do use libpfm4 extensively at Google in both the perf tool and
> applications. The PAPI toolkit also relies on this library.
>
> I don't see this as competing with the JSON approach. It is just an
> option I'd like to offer to users especially those familiar
> with it in their apps.

I dont mind having it, in fact I found really old email where I'm
asking Peter about that ;-) and he wasn't very keen about that:
https://lore.kernel.org/lkml/1312806326.10488.30.camel@twins/

not sure what was the actual reason at that time and if anything
changed since.. Peter?

btw I can't apply even that v2 on latest Arnaldo's branch

jirka

\
 
 \ /
  Last update: 2020-03-11 17:14    [W:0.071 / U:2.440 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site