From: Michael Ellerman <michael@ellerman.id.au>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org,
Stephane Eranian <eranian@google.com>,
Vince Weaver <vince@deater.net>,
acme@redhat.com, paulus@samba.org,
xiaoguangrong@linux.vnet.ibm.com,
Runzhen Wang <runzhen@linux.vnet.ibm.com>,
sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 2/2] perf tools: Make Power7 events available for perf
Date: Thu, 11 Jul 2013 16:58:08 +1000 [thread overview]
Message-ID: <20130711065807.GA26495@concordia> (raw)
In-Reply-To: <alpine.DEB.2.10.1307110039560.26051@vincent-weaver-1.um.maine.edu>
On Thu, Jul 11, 2013 at 12:42:31AM -0400, Vince Weaver wrote:
> On Wed, 10 Jul 2013, Ingo Molnar wrote:
>
> > Exactly - PMUs enumerated in /sys should be self-identifying, it's a
> > hardware topology after all ...
> >
> > Anytime userspace is forced to look into /proc, or into weird places in
> > /sys it's a FAIL really.
>
> well on x86 you have to look at /proc/cpuinfo to get the
> vendor/family/model number. Should we add some specifier under sys?
> It's probably too late though as all userspace event libs will have
> to look at /proc/cpuinfo anyway to be backwards compatible.
If it's a new library implementing a new feature then no I don't think
it needs to be backward compatible. It's just a choice the library makes
as to what extent it depends on new kernel features.
cheers
WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <michael@ellerman.id.au>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Vince Weaver <vince@deater.net>,
Runzhen Wang <runzhen@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
paulus@samba.org, acme@redhat.com,
Stephane Eranian <eranian@google.com>,
sukadev@linux.vnet.ibm.com, xiaoguangrong@linux.vnet.ibm.com
Subject: Re: [PATCH v2 2/2] perf tools: Make Power7 events available for perf
Date: Thu, 11 Jul 2013 16:58:08 +1000 [thread overview]
Message-ID: <20130711065807.GA26495@concordia> (raw)
In-Reply-To: <alpine.DEB.2.10.1307110039560.26051@vincent-weaver-1.um.maine.edu>
On Thu, Jul 11, 2013 at 12:42:31AM -0400, Vince Weaver wrote:
> On Wed, 10 Jul 2013, Ingo Molnar wrote:
>
> > Exactly - PMUs enumerated in /sys should be self-identifying, it's a
> > hardware topology after all ...
> >
> > Anytime userspace is forced to look into /proc, or into weird places in
> > /sys it's a FAIL really.
>
> well on x86 you have to look at /proc/cpuinfo to get the
> vendor/family/model number. Should we add some specifier under sys?
> It's probably too late though as all userspace event libs will have
> to look at /proc/cpuinfo anyway to be backwards compatible.
If it's a new library implementing a new feature then no I don't think
it needs to be backward compatible. It's just a choice the library makes
as to what extent it depends on new kernel features.
cheers
next prev parent reply other threads:[~2013-07-11 6:58 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-25 14:35 [PATCH v2 0/2] perf tools: Power7 events name available for perf Runzhen Wang
2013-06-25 14:35 ` Runzhen Wang
2013-06-25 14:35 ` [PATCH v3 1/2] perf tools: fix a typo of a Power7 event name Runzhen Wang
2013-06-25 14:35 ` Runzhen Wang
2013-06-27 14:26 ` Michael Ellerman
2013-06-27 14:26 ` Michael Ellerman
2013-06-25 14:35 ` [PATCH v2 2/2] perf tools: Make Power7 events available for perf Runzhen Wang
2013-06-25 14:35 ` Runzhen Wang
2013-06-25 16:46 ` Vince Weaver
2013-06-25 16:46 ` Vince Weaver
2013-07-04 12:52 ` Michael Ellerman
2013-07-04 12:52 ` Michael Ellerman
2013-07-04 12:57 ` Peter Zijlstra
2013-07-04 12:57 ` Peter Zijlstra
2013-07-05 10:23 ` Ingo Molnar
2013-07-05 10:23 ` Ingo Molnar
2013-07-09 1:29 ` Michael Ellerman
2013-07-09 1:29 ` Michael Ellerman
2013-07-09 2:24 ` Vince Weaver
2013-07-09 2:24 ` Vince Weaver
2013-07-09 3:34 ` Michael Ellerman
2013-07-09 3:34 ` Michael Ellerman
2013-07-09 15:20 ` Vince Weaver
2013-07-09 15:20 ` Vince Weaver
2013-07-10 2:37 ` Michael Ellerman
2013-07-10 2:37 ` Michael Ellerman
2013-07-09 8:14 ` Peter Zijlstra
2013-07-09 8:14 ` Peter Zijlstra
2013-07-09 15:05 ` Vince Weaver
2013-07-09 15:05 ` Vince Weaver
2013-07-11 10:58 ` Will Deacon
2013-07-11 10:58 ` Will Deacon
2013-07-11 17:53 ` Vince Weaver
2013-07-11 17:53 ` Vince Weaver
2013-07-10 3:09 ` Michael Ellerman
2013-07-10 3:09 ` Michael Ellerman
2013-07-10 8:34 ` Ingo Molnar
2013-07-10 8:34 ` Ingo Molnar
2013-07-11 4:42 ` Vince Weaver
2013-07-11 4:42 ` Vince Weaver
2013-07-11 6:58 ` Michael Ellerman [this message]
2013-07-11 6:58 ` Michael Ellerman
2013-06-27 14:23 ` Michael Ellerman
2013-06-27 14:23 ` Michael Ellerman
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