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author | Jin Yao <yao.jin@linux.intel.com> | 2021-05-14 20:29:47 +0800 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-05-17 10:55:10 -0300 |
commit | f7d74ce32fc1b9b3cbf58c015009d1f616e60c23 (patch) | |
tree | c1cf448b3a33bab5d2da68e7678faea9ac5dfbe7 /tools/perf/Documentation/perf.data-file-format.txt | |
parent | 1ac9e0b5731ad732ddc045cfcfd6739e4e12f3b5 (diff) | |
download | linux-stable-f7d74ce32fc1b9b3cbf58c015009d1f616e60c23.tar.gz linux-stable-f7d74ce32fc1b9b3cbf58c015009d1f616e60c23.tar.bz2 linux-stable-f7d74ce32fc1b9b3cbf58c015009d1f616e60c23.zip |
perf header: Support HYBRID_TOPOLOGY feature
It is useful to let the user know about the hybrid topology.
Add the HYBRID_TOPOLOGY feature in header to indicate the core CPUs
and the atom CPUs.
With this patch a perf.data generated on a hybrid platform reports
the hybrid CPU list:
root@otcpl-adl-s-2:~# perf report --header-only -I
...
# hybrid cpu system:
# cpu_core cpu list : 0-15
# cpu_atom cpu list : 16-23
For a perf.data generated on a non-hybrid platform, reports a message
that HYBRID_TOPOLOGY is missing:
root@kbl-ppc:~# perf report --header-only -I
...
# missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA HYBRID_TOPOLOGY
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210514122948.9472-2-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf.data-file-format.txt')
-rw-r--r-- | tools/perf/Documentation/perf.data-file-format.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt index 9ee96640744e..fbee9e580ee4 100644 --- a/tools/perf/Documentation/perf.data-file-format.txt +++ b/tools/perf/Documentation/perf.data-file-format.txt @@ -402,6 +402,23 @@ struct { u64 clockid_time_ns; }; + HEADER_HYBRID_TOPOLOGY = 30, + +Indicate the hybrid CPUs. The format of data is as below. + +struct { + u32 nr; + struct { + char pmu_name[]; + char cpus[]; + } [nr]; /* Variable length records */ +}; + +Example: + hybrid cpu system: + cpu_core cpu list : 0-15 + cpu_atom cpu list : 16-23 + other bits are reserved and should ignored for now HEADER_FEAT_BITS = 256, |