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Linux/tools/perf/Documentation/tips.txt

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Diff markup

Differences between /tools/perf/Documentation/tips.txt (Version linux-6.12-rc7) and /tools/perf/Documentation/tips.txt (Version linux-2.6.0)


  1 For a higher level overview, try: perf report     
  2 Sample related events with: perf record -e '{c    
  3 Compare performance results with: perf diff [<    
  4 Boolean options have negative forms, e.g.: per    
  5 To not accumulate CPU time of children symbols    
  6 Customize output of perf script with: perf scr    
  7 Generate a script for your data: perf script -    
  8 Save output of perf stat using: perf stat reco    
  9 Create an archive with symtabs to analyse on o    
 10 Search options using a keyword: perf report -h    
 11 Use parent filter to see specific call path: p    
 12 List events using substring match: perf list <    
 13 To see list of saved events and attributes: pe    
 14 Use --symfs <dir> if your symbol files are in     
 15 To see callchains in a more compact form: perf    
 16 To see call chains by final symbol taking CPU     
 17 Show individual samples with: perf script         
 18 Limit to show entries above 5% only: perf repo    
 19 Profiling branch (mis)predictions with: perf r    
 20 To show assembler sample context control flow     
 21 To adjust path to source files to local file s    
 22 Treat branches as callchains: perf record -b .    
 23 Show estimate cycles per function and IPC in a    
 24 To count events every 1000 msec: perf stat -I     
 25 Print event counts in machine readable CSV for    
 26 If you have debuginfo enabled, try: perf repor    
 27 For memory address profiling, try: perf mem re    
 28 For tracepoint events, try: perf report -s tra    
 29 To record callchains for each sample: perf rec    
 30 If call chains don't work try perf record --ca    
 31 To record every process run by a user: perf re    
 32 To show inline functions in call traces add --    
 33 To not record events from perf itself add --ex    
 34 Skip collecting build-id when recording: perf     
 35 To change sampling frequency to 100 Hz: perf r    
 36 To show information about system the samples w    
 37 To only collect call graph on one event use pe    
 38 To set sampling period of individual events us    
 39 To group events which need to be collected tog    
 40 To compute metrics for samples use perf record    
 41 See assembly instructions with percentage: per    
 42 If you prefer Intel style assembly, try: perf     
 43 When collecting LBR backtraces use --stitch-lb    
 44 For hierarchical output, try: perf report --hi    
 45 Order by the overhead of source file name and     
 46 System-wide collection from all CPUs: perf rec    
 47 Show current config key-value pairs: perf conf    
 48 To collect Processor Trace with samples use pe    
 49 To trace calls using Processor Trace use perf     
 50 To measure approximate function latency with P    
 51 To trace only single function with Processor T    
 52 Show user configuration overrides: perf config    
 53 To add Node.js USDT(User-Level Statically Defi    
 54 To analyze cache line scalability issues use p    
 55 To browse sample contexts use perf report --sa    
 56 To separate samples by time use perf report --    
 57 To filter subset of samples with report or scr    
 58 To set sample time separation other than 100ms    
 59 Add -I to perf record to sample register value    
 60 To show IPC for sampling periods use perf reco    
 61 To show context switches in perf report sample    
 62 To show time in nanoseconds in record/report a    
 63 To compare hot regions in two workloads use pe    
 64 To compare scalability of two workload samples    
                                                      

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