diff options
Diffstat (limited to 'kernel/tools/perf/Documentation/perf-stat.txt')
| -rw-r--r-- | kernel/tools/perf/Documentation/perf-stat.txt | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/tools/perf/Documentation/perf-stat.txt b/kernel/tools/perf/Documentation/perf-stat.txt index 04e150d83..4e074a660 100644 --- a/kernel/tools/perf/Documentation/perf-stat.txt +++ b/kernel/tools/perf/Documentation/perf-stat.txt @@ -128,8 +128,9 @@ perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' -- m -I msecs:: --interval-print msecs:: - Print count deltas every N milliseconds (minimum: 100ms) - example: perf stat -I 1000 -e cycles -a sleep 5 +Print count deltas every N milliseconds (minimum: 10ms) +The overhead percentage could be high in some cases, for instance with small, sub 100ms intervals. Use with caution. + example: 'perf stat -I 1000 -e cycles -a sleep 5' --per-socket:: Aggregate counts per processor socket for system-wide mode measurements. This @@ -144,6 +145,10 @@ is a useful mode to detect imbalance between physical cores. To enable this mod use --per-core in addition to -a. (system-wide). The output includes the core number and the number of online logical processors on that physical processor. +--per-thread:: +Aggregate counts per monitored threads, when monitoring threads (-t option) +or processes (-p option). + -D msecs:: --delay msecs:: After starting the program, wait msecs before measuring. This is useful to |