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Commit ca52babe authored by Andi Kleen's avatar Andi Kleen Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add some new tips describing the new options 



Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190311144502.15423-9-andi@firstfloor.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 4968ac8f

tools/perf/Documentation/tips.txt

+7 −0
Original line number Diff line number Diff line
@@ -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.