From: Borislav Petkov <bp@amd64.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@amd64.org>, Ingo Molnar <mingo@kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] perf: Add persistent event facilities
Date: Fri, 18 May 2012 17:24:56 +0200 [thread overview]
Message-ID: <20120518152456.GQ20215@aftab.osrc.amd.com> (raw)
In-Reply-To: <1337351857.573.47.camel@twins>
On Fri, May 18, 2012 at 04:37:37PM +0200, Peter Zijlstra wrote:
> > > I'm not seeing the relation to VM_SHARED here.
> >
> > Well, in the sense that if mmap fails in the !VM_SHARED case, I can't
> > enable any persistent events except the ones which are enabled and so
> > I need to allocate another set of resources for that second persistent
> > events user.
>
> Right, well, you could actually allow operations on the fd, just not a
> second mapping :-)
>
> Anyway.. I'd push that error back to the user. If they need a second
> set, let them create it.
>
> Do you really need multiple consumers for your MCE stuff? If so, what
> would be the problem of using VM_SHARED?
Nah, for MCE I'm fine with RO buffers, simple :-).
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
next prev parent reply other threads:[~2012-05-18 15:25 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-21 14:34 [RFC PATCH 0/2] " Borislav Petkov
2012-03-21 14:34 ` [PATCH 1/2] " Borislav Petkov
2012-05-18 9:58 ` Peter Zijlstra
2012-05-18 10:01 ` Borislav Petkov
2012-05-18 10:00 ` Peter Zijlstra
2012-05-18 10:02 ` Peter Zijlstra
2012-05-18 10:09 ` Peter Zijlstra
2012-05-18 10:49 ` Borislav Petkov
2012-05-18 10:14 ` Peter Zijlstra
2012-05-18 11:03 ` Borislav Petkov
2012-05-18 11:24 ` Peter Zijlstra
2012-05-18 11:59 ` Ingo Molnar
2012-05-18 12:55 ` Borislav Petkov
2012-05-18 13:37 ` Peter Zijlstra
2012-05-18 14:09 ` Borislav Petkov
2012-05-18 14:14 ` Peter Zijlstra
2012-05-18 14:21 ` Borislav Petkov
2012-05-18 14:37 ` Peter Zijlstra
2012-05-18 15:24 ` Borislav Petkov [this message]
2012-05-31 17:33 ` Borislav Petkov
2012-03-21 14:34 ` [PATCH 2/2] x86, mce: Add persistent MCE event Borislav Petkov
2012-03-22 8:36 ` Srivatsa S. Bhat
2012-03-22 11:40 ` Borislav Petkov
2012-03-22 11:57 ` Srivatsa S. Bhat
2012-03-23 12:31 ` Ingo Molnar
2012-03-23 13:30 ` Borislav Petkov
2012-03-24 7:37 ` Ingo Molnar
2012-03-24 9:00 ` Borislav Petkov
2012-03-24 9:15 ` Ingo Molnar
2012-05-15 15:32 ` Borislav Petkov
2012-05-18 8:18 ` Ingo Molnar
2012-05-18 10:03 ` Borislav Petkov
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