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Diffstat (limited to 'tools/perf/Documentation/tips.txt')
| -rw-r--r-- | tools/perf/Documentation/tips.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/Documentation/tips.txt b/tools/perf/Documentation/tips.txt index 67b326ba0040..ebf12a8c5db5 100644 --- a/tools/perf/Documentation/tips.txt +++ b/tools/perf/Documentation/tips.txt @@ -11,7 +11,7 @@ Search options using a keyword: perf report -h <keyword> Use parent filter to see specific call path: perf report -p <regex> List events using substring match: perf list <keyword> To see list of saved events and attributes: perf evlist -v -Use --symfs <dir> if your symbol files are in non-standard locations +Use --symfs <dir>[,layout] if your symbol files are in non-standard locations. To see callchains in a more compact form: perf report -g folded To see call chains by final symbol taking CPU time (bottom up) use perf report -G Show individual samples with: perf script @@ -62,3 +62,7 @@ To show context switches in perf report sample context add --switch-events to pe To show time in nanoseconds in record/report add --ns To compare hot regions in two workloads use perf record -b -o file ... ; perf diff --stream file1 file2 To compare scalability of two workload samples use perf diff -c ratio file1 file2 +For latency profiling, try: perf record/report --latency +For parallelism histogram, try: perf report --hierarchy --sort latency,parallelism,comm,symbol +To analyze particular parallelism levels, try: perf report --latency --parallelism=32-64 +To see how parallelism changes over time, try: perf report -F time,latency,parallelism --time-quantum=1s |