From: David Ahern <dsahern@gmail.com>
To: Stephane Eranian <eranian@google.com>, acme@redhat.com
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
mingo@elte.hu, robert.richter@amd.com, ming.m.lin@intel.com,
andi@firstfloor.org, asharma@fb.com, ravitillo@lbl.gov,
vweaver1@eecs.utk.edu, khandual@linux.vnet.ibm.com
Subject: Re: [PATCH v6 16/18] perf: enable reading of perf.data files from different ABI rev
Date: Thu, 09 Feb 2012 17:37:27 -0700 [thread overview]
Message-ID: <4F3466C7.7030804@gmail.com> (raw)
In-Reply-To: <1328826068-11713-17-git-send-email-eranian@google.com>
On 02/09/2012 03:21 PM, Stephane Eranian wrote:
> This patch allows perf to process perf.data files generated
> using an ABI that has a different perf_event_attr struct size, i.e.,
> a different ABI version.
>
> The perf_event_attr can be extended, yet perf needs to cope with
> older perf.data files. Similarly, perf must be able to cope with
> a perf.data file which is using a newer version of the ABI than
> what it knows about.
>
> This patch adds read_attr(), a routine that reads a perf_event_attr
> struct from a file incrementally based on its advertised size. If
> the on-file struct is smaller than what perf knows, then the extra
> fields are zeroed. If the on-file struct is bigger, then perf only
> uses what it knows about, the rest is skipped.
>
> Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: David Ahern <dsahern@gmail.com>
next prev parent reply other threads:[~2012-02-10 0:37 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-09 22:20 [PATCH v6 00/18] perf: add support for sampling taken branches Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 01/18] perf: add generic taken branch sampling support Stephane Eranian
2012-03-09 13:19 ` [tip:perf/hw-branch-sampling] perf: Add " tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 02/18] perf: add Intel LBR MSR definitions Stephane Eranian
2012-03-09 13:20 ` [tip:perf/hw-branch-sampling] perf/x86: Add " tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 03/18] perf: add Intel X86 LBR sharing logic Stephane Eranian
2012-03-09 13:21 ` [tip:perf/hw-branch-sampling] perf/x86: Add Intel " tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 04/18] perf: sync branch stack sampling with X86 precise_sampling Stephane Eranian
2012-03-09 13:21 ` [tip:perf/hw-branch-sampling] perf/x86: Sync branch stack sampling with precise_sampling tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 05/18] perf: add Intel X86 LBR mappings for PERF_SAMPLE_BRANCH filters Stephane Eranian
2012-03-09 13:22 ` [tip:perf/hw-branch-sampling] perf/x86: Add Intel " tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 06/18] perf: disable LBR support for older Intel Atom processors Stephane Eranian
2012-03-09 13:23 ` [tip:perf/hw-branch-sampling] perf/x86: Disable " tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 07/18] perf: implement PERF_SAMPLE_BRANCH for Intel X86 Stephane Eranian
2012-03-09 13:24 ` [tip:perf/hw-branch-sampling] perf/x86: Implement PERF_SAMPLE_BRANCH for Intel CPUs tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 08/18] perf: add LBR software filter support for Intel X86 Stephane Eranian
2012-03-09 13:25 ` [tip:perf/hw-branch-sampling] perf/x86: Add LBR software filter support for Intel CPUs tip-bot for Stephane Eranian
2012-02-09 22:20 ` [PATCH v6 09/18] perf: disable PERF_SAMPLE_BRANCH_* when not supported Stephane Eranian
2012-03-09 13:26 ` [tip:perf/hw-branch-sampling] perf: Disable " tip-bot for Stephane Eranian
2012-02-09 22:21 ` [PATCH v6 10/18] perf: add hook to flush branch_stack on context switch Stephane Eranian
2012-03-09 13:26 ` [tip:perf/hw-branch-sampling] perf: Add callback " tip-bot for Stephane Eranian
2012-02-09 22:21 ` [PATCH v6 11/18] perf: add code to support PERF_SAMPLE_BRANCH_STACK Stephane Eranian
2012-03-09 13:27 ` [tip:perf/hw-branch-sampling] perf tools: Add " tip-bot for Roberto Agostino Vitillo
2012-02-09 22:21 ` [PATCH v6 12/18] perf: add support for sampling taken branch to perf record Stephane Eranian
2012-03-09 13:28 ` [tip:perf/hw-branch-sampling] perf record: Add support for sampling taken branch tip-bot for Roberto Agostino Vitillo
2012-02-09 22:21 ` [PATCH v6 13/18] perf: add support for taken branch sampling to perf report Stephane Eranian
2012-02-14 21:47 ` Arnaldo Carvalho de Melo
2012-02-22 11:15 ` Ingo Molnar
2012-02-22 16:18 ` Stephane Eranian
2012-02-23 9:59 ` Ingo Molnar
2012-02-23 16:53 ` Stephane Eranian
2012-02-23 18:11 ` Arnaldo Carvalho de Melo
2012-02-23 20:48 ` Stephane Eranian
2012-03-09 13:29 ` [tip:perf/hw-branch-sampling] perf report: Add support for taken branch sampling tip-bot for Roberto Agostino Vitillo
2012-02-09 22:21 ` [PATCH v6 14/18] perf: fix endianness detection in perf.data Stephane Eranian
2012-02-09 22:32 ` David Ahern
2012-02-09 22:21 ` [PATCH v6 15/18] perf: add ABI reference sizes Stephane Eranian
2012-03-09 13:30 ` [tip:perf/hw-branch-sampling] perf: Add " tip-bot for Stephane Eranian
2012-02-09 22:21 ` [PATCH v6 16/18] perf: enable reading of perf.data files from different ABI rev Stephane Eranian
2012-02-09 22:39 ` David Ahern
2012-02-09 22:41 ` Stephane Eranian
2012-02-09 22:46 ` David Ahern
2012-02-09 22:49 ` Stephane Eranian
2012-02-10 0:37 ` David Ahern [this message]
2012-03-09 13:30 ` [tip:perf/hw-branch-sampling] perf tools: Enable reading of perf. data " tip-bot for Stephane Eranian
2012-02-09 22:21 ` [PATCH v6 17/18] perf: fix bug print_event_desc() Stephane Eranian
2012-03-09 13:31 ` [tip:perf/hw-branch-sampling] perf tools: Fix ABI compatibility bug in print_event_desc() tip-bot for Stephane Eranian
2012-02-09 22:21 ` [PATCH v6 18/18] perf: make perf able to read file from older ABIs Stephane Eranian
2012-03-09 13:32 ` [tip:perf/hw-branch-sampling] perf tools: Make perf able to read files " tip-bot for Stephane Eranian
2012-02-27 7:50 ` [PATCH v6 00/18] perf: add support for sampling taken branches Anshuman Khandual
2012-02-27 8:45 ` Stephane Eranian
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