* perf report broken for branch stack samples
@ 2015-04-01 9:02 ` Anshuman Khandual
0 siblings, 0 replies; 4+ messages in thread
From: Anshuman Khandual @ 2015-04-01 9:02 UTC (permalink / raw)
To: Linux PPC dev, Linux Kernel Mailing List
Cc: Sukadev Bhattiprolu, Michael Ellerman, Arnaldo Carvalho de Melo, ak
Hello,
perf report is not showing up the branch stack sample results in the
from_symbol ---> to_symbol format even if the perf.data file has got
the samples (through 'perf record -b <workload>' session). Perf report
still displays the generic event based relative symbol classification
as usual. This problem can also be seen on X86. I wonder whether there
is any semantics change in the way perf report auto detects branch stack
samples in the perf.data file and reports in the intended format. After
doing a git bisect session, this following commit seems to have changed
the perf report behavior.
commit fa94c36c29ed8bb4749b5fd7ea51a593f673dcef
Author: Andi Kleen <ak@linux.intel.com>
Date: Wed Nov 12 18:05:22 2014 -0800
perf report: Add --branch-history option
Add a --branch-history option to perf report that changes all the
settings necessary for using the branches in callstacks.
This is just a short cut to make this nicer to use, it does not enable
any functionality by itself.
v2: Change sort order. Rename option to --branch-history to
be less confusing.
v3: Updates
v4: Fix conflict with newer perf base
v5: Port to latest tip
v6: Add more comments. Remove CCKEY_ADDRESS setting. Remove
unnecessary branch_mode setting. Use a boolean.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1415844328-4884-5-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
I dont have much context of this change but it seems to be using branch
records along with call chain data (provided you have used both -b/-j
and -g option during perf record) to display better control flow graph ?
But then if we have just used -b and not -g then it should still give us
the previous output what we used to get.
Regards
Anshuman
^ permalink raw reply [flat|nested] 4+ messages in thread
* perf report broken for branch stack samples
@ 2015-04-01 9:02 ` Anshuman Khandual
0 siblings, 0 replies; 4+ messages in thread
From: Anshuman Khandual @ 2015-04-01 9:02 UTC (permalink / raw)
To: Linux PPC dev, Linux Kernel Mailing List
Cc: ak, Sukadev Bhattiprolu, Arnaldo Carvalho de Melo, Michael Ellerman
Hello,
perf report is not showing up the branch stack sample results in the
from_symbol ---> to_symbol format even if the perf.data file has got
the samples (through 'perf record -b <workload>' session). Perf report
still displays the generic event based relative symbol classification
as usual. This problem can also be seen on X86. I wonder whether there
is any semantics change in the way perf report auto detects branch stack
samples in the perf.data file and reports in the intended format. After
doing a git bisect session, this following commit seems to have changed
the perf report behavior.
commit fa94c36c29ed8bb4749b5fd7ea51a593f673dcef
Author: Andi Kleen <ak@linux.intel.com>
Date: Wed Nov 12 18:05:22 2014 -0800
perf report: Add --branch-history option
Add a --branch-history option to perf report that changes all the
settings necessary for using the branches in callstacks.
This is just a short cut to make this nicer to use, it does not enable
any functionality by itself.
v2: Change sort order. Rename option to --branch-history to
be less confusing.
v3: Updates
v4: Fix conflict with newer perf base
v5: Port to latest tip
v6: Add more comments. Remove CCKEY_ADDRESS setting. Remove
unnecessary branch_mode setting. Use a boolean.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1415844328-4884-5-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
I dont have much context of this change but it seems to be using branch
records along with call chain data (provided you have used both -b/-j
and -g option during perf record) to display better control flow graph ?
But then if we have just used -b and not -g then it should still give us
the previous output what we used to get.
Regards
Anshuman
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: perf report broken for branch stack samples
2015-04-01 9:02 ` Anshuman Khandual
@ 2015-04-06 23:35 ` Andi Kleen
-1 siblings, 0 replies; 4+ messages in thread
From: Andi Kleen @ 2015-04-06 23:35 UTC (permalink / raw)
To: Anshuman Khandual
Cc: Linux PPC dev, Linux Kernel Mailing List, Sukadev Bhattiprolu,
Michael Ellerman, Arnaldo Carvalho de Melo
On Wed, Apr 01, 2015 at 02:32:54PM +0530, Anshuman Khandual wrote:
> Hello,
>
> perf report is not showing up the branch stack sample results in the
> from_symbol ---> to_symbol format even if the perf.data file has got
> the samples (through 'perf record -b <workload>' session). Perf report
Sorry for the late answer. This was already fixed in tip by
commit fefd2d9619de3bf0bf02a8622e9f445c3d19cc3f
Author: He Kuang <hekuang@huawei.com>
Date: Sun Feb 15 10:33:37 2015 +0800
perf report: Fix branch stack mode cannot be set
-Andi
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: perf report broken for branch stack samples
@ 2015-04-06 23:35 ` Andi Kleen
0 siblings, 0 replies; 4+ messages in thread
From: Andi Kleen @ 2015-04-06 23:35 UTC (permalink / raw)
To: Anshuman Khandual
Cc: Linux PPC dev, Sukadev Bhattiprolu, Arnaldo Carvalho de Melo,
Linux Kernel Mailing List, Michael Ellerman
On Wed, Apr 01, 2015 at 02:32:54PM +0530, Anshuman Khandual wrote:
> Hello,
>
> perf report is not showing up the branch stack sample results in the
> from_symbol ---> to_symbol format even if the perf.data file has got
> the samples (through 'perf record -b <workload>' session). Perf report
Sorry for the late answer. This was already fixed in tip by
commit fefd2d9619de3bf0bf02a8622e9f445c3d19cc3f
Author: He Kuang <hekuang@huawei.com>
Date: Sun Feb 15 10:33:37 2015 +0800
perf report: Fix branch stack mode cannot be set
-Andi
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-04-06 23:35 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2015-04-01 9:02 perf report broken for branch stack samples Anshuman Khandual
2015-04-01 9:02 ` Anshuman Khandual
2015-04-06 23:35 ` Andi Kleen
2015-04-06 23:35 ` Andi Kleen
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