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perf data: Document clockid header: HEADER_CLOCKID

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We forgot to update the perf.data file format document for the
HEADER_CLOCKID header, do it now from comments in the patch introducing
it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Chong Jiang <chongjiang@chromium.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Que <sque@chromium.org>
Fixes: cf7905165f ("perf record: Encode -k clockid frequency into Perf trace")
Link: https://lkml.kernel.org/n/tip-slhnjp06027j3ae17qqetzxj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-05-29 15:43:51 -03:00
parent 835fbf126c
commit a9de7cfc76
1 changed files with 6 additions and 0 deletions
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6
tools/perf/Documentation/perf.data-file-format.txt
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@ -296,6 +296,12 @@ $ perf report --header-only -I
# memory nodes (nr 1, block size 0x8000000):
# 0 [7G]: 0-23,32-69
HEADER_CLOCKID = 23,
One uint64_t for the clockid frequency, specified, for instance, via 'perf
record -k' (see clock_gettime()), to enable timestamps derived metrics
conversion into wall clock time on the reporting stage.
HEADER_BPF_PROG_INFO = 25,
struct bpf_prog_info_linear, which contains detailed information about