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author | David S. Miller <davem@davemloft.net> | 2019-03-27 17:37:58 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2019-03-27 17:37:58 -0700 |
commit | 356d71e00d278d865f8c7f68adebd6ce4698a7e2 (patch) | |
tree | 8cb2dabf7440b56c6dee76b4253210c6b603b98e /tools/perf/Documentation/tips.txt | |
parent | df453700e8d81b1bdafdf684365ee2b9431fb702 (diff) | |
parent | 1a9df9e29c2afecf6e3089442d429b377279ca3c (diff) | |
download | linux-356d71e00d278d865f8c7f68adebd6ce4698a7e2.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'tools/perf/Documentation/tips.txt')
-rw-r--r-- | tools/perf/Documentation/tips.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/Documentation/tips.txt b/tools/perf/Documentation/tips.txt index 849599f39c5e..869965d629ce 100644 --- a/tools/perf/Documentation/tips.txt +++ b/tools/perf/Documentation/tips.txt @@ -15,6 +15,7 @@ To see callchains in a more compact form: perf report -g folded Show individual samples with: perf script Limit to show entries above 5% only: perf report --percent-limit 5 Profiling branch (mis)predictions with: perf record -b / perf report +To show assembler sample contexts use perf record -b / perf script -F +brstackinsn --xed Treat branches as callchains: perf report --branch-history To count events in every 1000 msec: perf stat -I 1000 Print event counts in CSV format with: perf stat -x, @@ -34,3 +35,9 @@ Show current config key-value pairs: perf config --list Show user configuration overrides: perf config --user --list To add Node.js USDT(User-Level Statically Defined Tracing): perf buildid-cache --add `which node` To report cacheline events from previous recording: perf c2c report +To browse sample contexts use perf report --sample 10 and select in context menu +To separate samples by time use perf report --sort time,overhead,sym +To set sample time separation other than 100ms with --sort time use --time-quantum +Add -I to perf report to sample register values visible in perf report context. +To show IPC for sampling periods use perf record -e '{cycles,instructions}:S' and then browse context +To show context switches in perf report sample context add --switch-events to perf record. |