mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
ca52babe03
Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20190311144502.15423-9-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
44 lines
2.8 KiB
Plaintext
44 lines
2.8 KiB
Plaintext
For a higher level overview, try: perf report --sort comm,dso
|
|
Sample related events with: perf record -e '{cycles,instructions}:S'
|
|
Compare performance results with: perf diff [<old file> <new file>]
|
|
Boolean options have negative forms, e.g.: perf report --no-children
|
|
Customize output of perf script with: perf script -F event,ip,sym
|
|
Generate a script for your data: perf script -g <lang>
|
|
Save output of perf stat using: perf stat record <target workload>
|
|
Create an archive with symtabs to analyse on other machine: perf archive
|
|
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
|
|
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,
|
|
If you have debuginfo enabled, try: perf report -s sym,srcline
|
|
For memory address profiling, try: perf mem record / perf mem report
|
|
For tracepoint events, try: perf report -s trace_fields
|
|
To record callchains for each sample: perf record -g
|
|
To record every process run by a user: perf record -u <user>
|
|
Skip collecting build-id when recording: perf record -B
|
|
To change sampling frequency to 100 Hz: perf record -F 100
|
|
See assembly instructions with percentage: perf annotate <symbol>
|
|
If you prefer Intel style assembly, try: perf annotate -M intel
|
|
For hierarchical output, try: perf report --hierarchy
|
|
Order by the overhead of source file name and line number: perf report -s srcline
|
|
System-wide collection from all CPUs: perf record -a
|
|
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.
|