From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Stephane Eranian <eranian@google.com>,
LKML <linux-kernel@vger.kernel.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"ak@linux.intel.com" <ak@linux.intel.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung.kim@lge.com>
Subject: Re: [PATCH 0/8] perf: add ability to sample physical data addresses
Date: Wed, 26 Jun 2013 12:33:03 +0200 [thread overview]
Message-ID: <20130626103303.GB28407@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20130625105123.GA13649@gmail.com>
On Tue, Jun 25, 2013 at 12:51:23PM +0200, Ingo Molnar wrote:
> A syscall (ioctl?) to dump all current vmas into the mmap update stream
> (to form a starting point) might be handy - that would remove the
> fragility and overhead of parsing /proc/ details.
Its more difficult than that though :/ Suppose not all mmap events fit
in the output buffer and you're not able to read from the buffer because
you're stuck in the ioctl().
This means we need to either force userspace to use threads to reliably
use the feature; or complicate the ioctl() to allow vma ranges -- which
introduces an inherent race window etc..
Neither option are really pretty and we already have the maps parse code
-- also its not _that_ hard to parse either.
next prev parent reply other threads:[~2013-06-26 15:19 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-21 14:20 [PATCH 0/8] perf: add ability to sample physical data addresses Stephane Eranian
2013-06-21 14:20 ` [PATCH 1/8] perf,x86: disable PEBS-LL in intel_pmu_pebs_disable() Stephane Eranian
2013-06-24 8:44 ` Peter Zijlstra
2013-06-26 7:35 ` Stephane Eranian
2013-06-27 9:01 ` [tip:perf/core] perf/x86: Disable " tip-bot for Stephane Eranian
2013-06-21 14:20 ` [PATCH 2/8] perf,x86: drop event->flags and use hw.constraint->flags Stephane Eranian
2013-06-24 8:45 ` Peter Zijlstra
2013-06-26 7:36 ` Stephane Eranian
2013-06-26 10:36 ` Peter Zijlstra
2013-06-27 10:23 ` Stephane Eranian
2013-06-27 10:48 ` Peter Zijlstra
2013-06-27 11:01 ` Stephane Eranian
2013-06-27 11:14 ` Peter Zijlstra
2013-06-27 12:33 ` Stephane Eranian
2013-06-27 14:10 ` Peter Zijlstra
2013-06-21 14:20 ` [PATCH 3/8] perf,x86: add uvirt_to_phys_nmi helper function Stephane Eranian
2013-06-21 14:20 ` [PATCH 4/8] perf: add PERF_SAMPLE_PHYS_ADDR sample type Stephane Eranian
2013-06-21 14:20 ` [PATCH 5/8] perf,x86: add support for PERF_SAMPLE_PHYS_ADDR for PEBS-LL Stephane Eranian
2013-06-21 14:20 ` [PATCH 6/8] perf tools: add infrastructure to handle PERF_SAMPLE_PHYS_ADDR Stephane Eranian
2013-06-21 14:20 ` [PATCH 7/8] perf record: add option to sample physical load/store addresses Stephane Eranian
2013-06-21 14:20 ` [PATCH 8/8] perf mem: add physical addr sampling support Stephane Eranian
2013-06-23 21:58 ` [PATCH 0/8] perf: add ability to sample physical data addresses Jiri Olsa
2013-06-24 8:16 ` Stephane Eranian
2013-06-24 8:45 ` Jiri Olsa
2013-06-24 8:43 ` Peter Zijlstra
2013-06-25 9:59 ` Stephane Eranian
2013-06-25 10:47 ` Peter Zijlstra
2013-06-25 10:51 ` Ingo Molnar
2013-06-26 10:33 ` Peter Zijlstra [this message]
2013-06-26 19:10 ` Stephane Eranian
2013-06-28 9:58 ` Peter Zijlstra
2013-07-05 22:48 ` Stephane Eranian
2013-07-08 8:19 ` Peter Zijlstra
2013-07-09 6:02 ` Stephane Eranian
2013-07-30 8:02 ` Stephane Eranian
2013-07-30 8:37 ` Peter Zijlstra
2013-07-30 8:51 ` Stephane Eranian
2013-07-30 9:02 ` Peter Zijlstra
2013-07-30 13:09 ` Stephane Eranian
2013-07-30 14:21 ` Stephane Eranian
2013-07-30 14:50 ` David Ahern
2013-07-30 14:53 ` Stephane Eranian
2013-07-30 14:59 ` David Ahern
2013-07-30 15:52 ` Peter Zijlstra
2013-07-30 16:09 ` Stephane Eranian
2013-07-30 16:16 ` Peter Zijlstra
2013-06-26 13:29 ` Ingo Molnar
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