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authorStephane Eranian <eranian@google.com>2012-03-08 23:47:47 +0100
committerIngo Molnar <mingo@elte.hu>2012-03-09 08:26:08 +0100
commit993ac88d5892629fbe1f8a54857f9947f49f0d96 (patch)
tree27f23cc95a72be350781803530e09b1535b719e7 /tools/perf/Documentation
parent330aa675b4f92a422cb6d3acbbfd16a628017520 (diff)
downloadop-kernel-dev-993ac88d5892629fbe1f8a54857f9947f49f0d96.zip
op-kernel-dev-993ac88d5892629fbe1f8a54857f9947f49f0d96.tar.gz
perf report: Auto-detect branch stack sampling mode
This patch enhances perf report to auto-detect when the perf.data file contains samples with branch stacks. That way it is not necessary to use the -b option. To force branch view mode to off, simply use --no-branch-stack. Signed-off-by: Stephane Eranian <eranian@google.com> Cc: peterz@infradead.org Cc: acme@redhat.com Cc: asharma@fb.com Cc: ravitillo@lbl.gov Cc: vweaver1@eecs.utk.edu Cc: khandual@linux.vnet.ibm.com Cc: dsahern@gmail.com Link: http://lkml.kernel.org/r/1331246868-19905-4-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/Documentation')
-rw-r--r--tools/perf/Documentation/perf-report.txt7
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 19b9092..87feeee 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -157,8 +157,11 @@ OPTIONS
--branch-stack::
Use the addresses of sampled taken branches instead of the instruction
address to build the histograms. To generate meaningful output, the
- perf.data file must have been obtained using perf record -b xxx where
- xxx is a branch filter option.
+ perf.data file must have been obtained using perf record -b or
+ perf record --branch-filter xxx where xxx is a branch filter option.
+ perf report is able to auto-detect whether a perf.data file contains
+ branch stacks and it will automatically switch to the branch view mode,
+ unless --no-branch-stack is used.
SEE ALSO
--------
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