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2011-08-18perf stat: Add -o and --append optionsStephane Eranian
This patch adds an option (-o) to save the output of perf stat into a file. You could do this with perf record but not with perf stat. Instead, you had to fiddle with stderr to save the counts into a separate file. The patch also adds the --append option so that results can be concatenated into a single file across runs. Each run of the tool is clearly separated by a comment line starting with a hash mark. The -A option of perf record is already used by perf stat, so we only add a long option. $ perf stat -o res.txt date $ cat res.txt Performance counter stats for 'date': 0.791306 task-clock # 0.668 CPUs utilized 2 context-switches # 0.003 M/sec 0 CPU-migrations # 0.000 M/sec 197 page-faults # 0.249 M/sec 1878143 cycles # 2.373 GHz <not supported> stalled-cycles-frontend <not supported> stalled-cycles-backend 1083367 instructions # 0.58 insns per cycle 193027 branches # 243.935 M/sec 9014 branch-misses # 4.67% of all branches 0.001184746 seconds time elapsed The option can be combined with -x to make the output file much easier to parse. Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20110815202233.GA18535@quad Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-08-18perf tools: Add group event scheduling option to perf record/statLin Ming
Group event scheduling command line option is missing in perf record/stat. Add it to perf record/stat, which is same as in perf top. Reported-by: Andi Kleen <andi@firstfloor.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1313577727.2754.5.camel@hp6530s Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-07-21perf tools: De-opt the parse_events functionJiri Olsa
Moving out the option parameter from parse_events function, and adding new parse_events_option function instead. The option parameter is used only to carry "struct perf_evlist" pointer for chaining new events. Putting it away, enable us to call parse_events from other places without using the option parameter. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: acme@redhat.com Cc: a.p.zijlstra@chello.nl Cc: paulus@samba.org Link: http://lkml.kernel.org/r/1310635534-4013-2-git-send-email-jolsa@redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-07-01perf stat: Add noise output for csv modeZhengyu He
Previously, when you want perf-stat to output the statistics in csv mode, no information of the noise will be printed out. For example right now we output this --repeat information: ./perf stat -r3 -x, sleep 1 1.164789,task-clock 8,context-switches 0,CPU-migrations 219,page-faults 3337800,cycles With this patch, the output will be appended with an additional entry for the noise value: ./perf stat -r3 -x, sleep 1 1.164789,task-clock,3.75% 8,context-switches,75.00% 0,CPU-migrations,100.00% 219,page-faults,0.00% 3337800,cycles,3.36% Signed-off-by: Zhengyu He <zhengyuh@google.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Stephane Eranian <eranian@google.com> Cc: Venkatesh Pallipadi <venki@google.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/1308861942-4945-1-git-send-email-zhengyuh@google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-06-02perf stat: clarify unsupported events from uncounted eventsDavid Ahern
perf stat continues running even if the event list contains counters that are not supported. The resulting output then contains <not counted> for those events which gets confusing as to which events are supported, but not counted and which are not supported. Before: perf stat -ddd -- sleep 1 Performance counter stats for 'sleep 1': 0.571283 task-clock # 0.001 CPUs utilized 1 context-switches # 0.002 M/sec 0 CPU-migrations # 0.000 M/sec 157 page-faults # 0.275 M/sec 1,037,707 cycles # 1.816 GHz <not counted> stalled-cycles-frontend <not counted> stalled-cycles-backend 654,499 instructions # 0.63 insns per cycle 136,129 branches # 238.286 M/sec <not counted> branch-misses <not counted> L1-dcache-loads <not counted> L1-dcache-load-misses <not counted> LLC-loads <not counted> LLC-load-misses <not counted> L1-icache-loads <not counted> L1-icache-load-misses <not counted> dTLB-loads <not counted> dTLB-load-misses <not counted> iTLB-loads <not counted> iTLB-load-misses <not counted> L1-dcache-prefetches <not counted> L1-dcache-prefetch-misses 1.001004836 seconds time elapsed After: perf stat -ddd -- sleep 1 Performance counter stats for 'sleep 1': 1.350326 task-clock # 0.001 CPUs utilized 2 context-switches # 0.001 M/sec 0 CPU-migrations # 0.000 M/sec 157 page-faults # 0.116 M/sec 11,986 cycles # 0.009 GHz <not supported> stalled-cycles-frontend <not supported> stalled-cycles-backend 496,986 instructions # 41.46 insns per cycle 138,065 branches # 102.246 M/sec 7,245 branch-misses # 5.25% of all branches <not counted> L1-dcache-loads <not counted> L1-dcache-load-misses <not counted> LLC-loads <not counted> LLC-load-misses <not counted> L1-icache-loads <not counted> L1-icache-load-misses <not counted> dTLB-loads <not counted> dTLB-load-misses <not counted> iTLB-loads <not counted> iTLB-load-misses <not counted> L1-dcache-prefetches <not supported> L1-dcache-prefetch-misses 1.002397333 seconds time elapsed v1->v2: changed supported type from int to bool v2->v3 fixed vertical alignment of new struct element Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1306767359-13221-1-git-send-email-dsahern@gmail.com Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-05-19perf stat: Add more cache-miss percentage printoutsIngo Molnar
Print out the cache-miss percentage as well if the cache refs were collected, for all the generic cache event types. Before: 11,103,723,230 dTLB-loads # 622.471 M/sec ( +- 0.30% ) 87,065,337 dTLB-load-misses # 4.881 M/sec ( +- 0.90% ) After: 11,353,713,242 dTLB-loads # 626.020 M/sec ( +- 0.35% ) 113,393,472 dTLB-load-misses # 1.00% of all dTLB cache hits ( +- 0.49% ) Also ASCII color highlight too high percentages, them when it's executed on the console. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-lkhwxsevdbd9a8nymx0vxc3y@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-05-19perf stat: Add -d -d and -d -d -d options to show more CPU eventsIngo Molnar
Print even more detailed statistics if requested via perf stat -d: -d: detailed events, L1 and LLC data cache -d -d: more detailed events, dTLB and iTLB events -d -d -d: very detailed events, adding prefetch events Full output looks like this now: Performance counter stats for '/home/mingo/hackbench 10' (5 runs): 1703.674707 task-clock # 8.709 CPUs utilized ( +- 4.19% ) 49,068 context-switches # 0.029 M/sec ( +- 16.66% ) 8,303 CPU-migrations # 0.005 M/sec ( +- 24.90% ) 17,397 page-faults # 0.010 M/sec ( +- 0.46% ) 2,345,389,239 cycles # 1.377 GHz ( +- 4.61% ) [55.90%] 1,884,503,527 stalled-cycles-frontend # 80.35% frontend cycles idle ( +- 5.67% ) [50.39%] 743,919,737 stalled-cycles-backend # 31.72% backend cycles idle ( +- 8.75% ) [49.91%] 1,314,416,379 instructions # 0.56 insns per cycle # 1.43 stalled cycles per insn ( +- 2.53% ) [60.87%] 272,592,567 branches # 160.003 M/sec ( +- 1.74% ) [56.56%] 3,794,846 branch-misses # 1.39% of all branches ( +- 6.59% ) [58.50%] 449,982,778 L1-dcache-loads # 264.125 M/sec ( +- 2.47% ) [49.88%] 22,404,961 L1-dcache-load-misses # 4.98% of all L1-dcache hits ( +- 6.08% ) [55.05%] 6,204,750 LLC-loads # 3.642 M/sec ( +- 8.91% ) [43.75%] 1,837,411 LLC-load-misses # 1.078 M/sec ( +- 7.27% ) [12.07%] 411,440,421 L1-icache-loads # 241.502 M/sec ( +- 5.60% ) [36.52%] 27,556,832 L1-icache-load-misses # 16.175 M/sec ( +- 7.46% ) [46.72%] 464,067,627 dTLB-loads # 272.392 M/sec ( +- 4.46% ) [54.17%] 10,765,648 dTLB-load-misses # 6.319 M/sec ( +- 3.18% ) [48.68%] 1,273,080,386 iTLB-loads # 747.256 M/sec ( +- 3.38% ) [47.53%] 117,481 iTLB-load-misses # 0.069 M/sec ( +- 14.99% ) [47.01%] 4,590,653 L1-dcache-prefetches # 2.695 M/sec ( +- 4.49% ) [46.19%] 1,712,660 L1-dcache-prefetch-misses # 1.005 M/sec ( +- 3.75% ) [44.82%] 0.195622057 seconds time elapsed ( +- 6.84% ) Also clean up the attribute construction code to be appending, and factor it out into add_default_attributes(). Tweak the coverage percentage printout a bit, so that it's easier to view it alongside the +- sttddev colum. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-to3kgu04449s64062val8b62@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-30perf stat: Tell user about unsupported events in the listDavid Ahern
Similar to perf-record, tell user about unsupported events that will not be counted if invoked in verbose mode. e.g., $ perf stat -e dTLB-prefetch-misses -v -- sleep 1 dTLB-prefetch-misses event is not supported by the kernel. dTLB-prefetch-misses: 0 0 0 Performance counter stats for 'sleep 1': <not counted> dTLB-prefetch-misses 1.001884783 seconds time elapsed Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/1304114655-10600-1-git-send-email-dsahern@gmail.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-29perf stat: Fail softly on unsupported eventsIngo Molnar
David Ahern reported this perf stat failure: > # /tmp/build-perf/perf stat -- sleep 1 > Error: stalled-cycles-frontend event is not supported. > Fatal: Not all events could be opened. > > This is a Dell R410 with an E5620 processor. Fail in a softer fashion on unknown/unsupported events. Reported-by: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n006io7hjpn1dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-29perf stat: Leave more room for percentagesIngo Molnar
Triple digit percentages do not fit otherwise. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n005io7hjpn1dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-29perf stat: Adjust stall cycles warning percentagesIngo Molnar
Adjust to color thresholds to better match the percentages seen in real workloads. Both are now a bit more sensitive. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n004io7hjpn1dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-29perf stat: Analyze front-end and back-end stall countsIngo Molnar
Sample output: Performance counter stats for './loop_1b': 873.691065 task-clock # 1.000 CPUs utilized 1 context-switches # 0.000 M/sec 1 CPU-migrations # 0.000 M/sec 96 page-faults # 0.000 M/sec 2,012,637,222 cycles # 2.304 GHz (66.58%) 1,001,397,911 stalled-cycles-frontend # 49.76% frontend cycles idle (66.58%) 7,523,398 stalled-cycles-backend # 0.37% backend cycles idle (66.76%) 2,004,551,046 instructions # 1.00 insns per cycle # 0.50 stalled cycles per insn (66.80%) 1,001,304,992 branches # 1146.063 M/sec (66.76%) 39,453 branch-misses # 0.00% of all branches (66.64%) 0.874046121 seconds time elapsed Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n003io7hjpn1dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-29perf tools: Add front-end and back-end stalled cycles supportIngo Molnar
Update perf tooling to deal with front-end and back-end stalled cycles events. Add both the default 'perf stat' output. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n002io7hjpn1dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-28perf stat: Fix compatibility behaviorIngo Molnar
Instead of failing on an unknown event, when new perf stat is run on older kernels: $ ./perf stat true Error: open_counter returned with 22 (Invalid argument). /bin/dmesg may provide additional information. Fatal: Not all events could be opened. Just ignore EINVAL and ENOSYS, we'll print the results as not counted: Performance counter stats for 'true': 0.239483 task-clock # 0.493 CPUs utilized 0 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 86 page-faults # 0.359 M/sec 704,766 cycles # 2.943 GHz <not counted> stalled-cycles 381,961 instructions # 0.54 insns per cycle 69,626 branches # 290.735 M/sec 4,594 branch-misses # 6.60% of all branches 0.000485883 seconds time elapsed Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n1eqio5hjpn3dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-28perf stat: Add --sync/-S optionIngo Molnar
--sync will tell perf stat to run sync() before starting a command. This allows IO-heavy tests to be used with --repeat, without one iteration impacting the other. Elapsed time will stabilize for example: before: 3.971525714 seconds time elapsed ( +- 8.56% ) after: 3.211098537 seconds time elapsed ( +- 1.52% ) So measurements will be more accurate. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n1eqio7hjpn1dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-27perf stat: Fix printout vertical alignmentIngo Molnar
Before: | | Performance counter stats for '/home/mingo/hackbench 20' (5 runs): | | 71,321,607 instructions:u # 0.42 insns per cycle ( +- 0.00% ) | 168,040,009 cycles:u # 0.000 GHz ( +- 0.81% ) | | 1.468002368 seconds time elapsed ( +- 1.33% ) | After: | | Performance counter stats for '/home/mingo/hackbench 20' (5 runs): | | 71,321,607 instructions:u # 0.42 insns per cycle ( +- 0.00% ) | 168,040,009 cycles:u # 0.000 GHz ( +- 0.81% ) | | 1.468002368 seconds time elapsed ( +- 1.33% ) | The last column (stddev noise) is properly aligned, vertically. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n1eqio7hjpn0dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Add -d/--detailed flag to run with a lot of eventsIngo Molnar
Add the new -d/--detailed flag, which generates a pretty detailed event list: Performance counter stats for './hackbench 10' (10 runs): 1514.287888 task-clock # 10.897 CPUs utilized ( +- 3.05% ) 39,698 context-switches # 0.026 M/sec ( +- 12.19% ) 8,147 CPU-migrations # 0.005 M/sec ( +- 16.55% ) 17,918 page-faults # 0.012 M/sec ( +- 0.37% ) 2,944,504,050 cycles # 1.944 GHz ( +- 3.89% ) (32.60%) 1,043,971,283 stalled-cycles # 35.45% of all cycles are idle ( +- 5.22% ) (44.48%) 1,655,906,768 instructions # 0.56 insns per cycle # 0.63 stalled cycles per insn ( +- 1.95% ) (55.09%) 338,832,373 branches # 223.757 M/sec ( +- 1.96% ) (64.47%) 3,892,416 branch-misses # 1.15% of all branches ( +- 5.49% ) (73.12%) 606,410,482 L1-dcache-loads # 400.459 M/sec ( +- 1.29% ) (71.21%) 31,204,395 L1-dcache-load-misses # 5.15% of all L1-dcache hits ( +- 3.04% ) (60.43%) 3,922,751 LLC-loads # 2.590 M/sec ( +- 6.80% ) (46.87%) 5,037,288 LLC-load-misses # 3.327 M/sec ( +- 3.56% ) (13.00%) 0.138966828 seconds time elapsed ( +- 4.11% ) This can be used "at a glance" for narrower analysis. -d can also be used in addition to other -e events, to further expand an event list. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-cxs98quixs3qyvdqx3goojc4@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Print out miss/hit ratio for L1 data-cache eventsIngo Molnar
Print out this kind of l1-dcache-misses percentage: Performance counter stats for './bw_tcp localhost': 29,956,262,201 cycles # 3.002 GHz (scaled from 85.14%) 8,255,209,558 stalled-cycles # 27.56% of all cycles are idle (scaled from 86.56%) 1,206,130,308 l1-dcache-misses # 40.49% of all L1-dcache hits (scaled from 86.30%) 2,978,756,779 l1-dcache-refs # 298.512 M/sec (scaled from 70.02%) 8,861,956,159 instructions # 0.30 insns per cycle # 0.93 stalled cycles per insn (scaled from 84.27%) 1,644,306,068 branches # 164.782 M/sec (scaled from 86.43%) 74,778,443 branch-misses # 4.55% of all branches (scaled from 70.69%) 9978.695711 task-clock # 0.693 CPUs utilized 14.404347983 seconds time elapsed And color the result depending on the severity of cache-trashing. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-54gmz0zymaid84zcs7joq02p@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Print branch misses warning colorsIngo Molnar
Print the missed-branches percentage with different warning level ASCII colors, as the percentage passes the 5%/10%/20% thresholds. These thresholds are set to relatively low levels, because on most CPUs even a moderate percentage of branch-misses already shows up as a slowdown. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-ybqukg7p86leiup7gl03ecgk@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Print stalled cycles warning colorsIngo Molnar
Print the stalled-cycles percentage with different warning level ASCII colors, as the percentage passes the 25%/50%/75% thresholds. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-e25zz44rcms7mu9az4fu5zp0@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Fix -nan% output in perf stat noise printoutsIngo Molnar
Before: 0 CPU-migrations # 0.000 M/sec ( +- -nan% ) After: 0 CPU-migrations # 0.000 M/sec ( +- 0.00% ) Also factor out the noise printing function. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-z89h2v1bk1mikcbsf7e6v34q@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Add stalled cycles to the default outputIngo Molnar
The new default output looks like this: Performance counter stats for './loop_1b_instructions': 236.010686 task-clock # 0.996 CPUs utilized 0 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 99 page-faults # 0.000 M/sec 756,487,646 cycles # 3.205 GHz 354,938,996 stalled-cycles # 46.92% of all cycles are idle 1,001,403,797 instructions # 1.32 insns per cycle # 0.35 stalled cycles per insn 100,279,773 branches # 424.895 M/sec 12,646 branch-misses # 0.013 % of all branches 0.236902540 seconds time elapsed We dropped cache-refs and cache-misses and added stalled-cycles - this is a more generic "how well utilized is the CPU" metric. If the stalled-cycles ratio is too high then more specific measurements can be taken to figure out the source of the inefficiency. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-pbpl2l4mn797s69bclfpwkwn@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Add stalled cycles accounting, prettify the resulting outputIngo Molnar
Add stalled cycles accounting and use it to print the "cycles stalled per instruction" value. Also change the unit of the cycles output from M/sec to GHz - this is more intuitive. Prettify the output to: Performance counter stats for './loop_1b_instructions': 239.775036 task-clock # 0.997 CPUs utilized 761,903,912 cycles # 3.178 GHz 356,620,620 stalled-cycles # 46.81% of all cycles are idle 1,001,578,351 instructions # 1.31 insns per cycle # 0.36 stalled cycles per insn 14,782 cache-references # 0.062 M/sec 5,694 cache-misses # 38.520 % of all cache refs 0.240493656 seconds time elapsed Also adjust the --repeat output to make the percentages align vertically: Performance counter stats for './loop_1b_instructions' (10 runs): 236.096793 task-clock # 0.997 CPUs utilized ( +- 0.011% ) 756,553,086 cycles # 3.204 GHz ( +- 0.002% ) 354,942,692 stalled-cycles # 46.92% of all cycles are idle ( +- 0.008% ) 1,001,389,700 instructions # 1.32 insns per cycle # 0.35 stalled cycles per insn ( +- 0.000% ) 10,166 cache-references # 0.043 M/sec ( +- 0.742% ) 468 cache-misses # 4.608 % of all cache refs ( +- 13.385% ) 0.236874136 seconds time elapsed ( +- 0.01% ) Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-uapziqny39601apdmmhoz7hk@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Factor our shadow statsIngo Molnar
Create update_shadow_stats() which is then used in both read_counter_aggr() and read_counter(). This not only simplifies the code but also fixes a bug: HW_CACHE_REFERENCES was not updated in read_counter(). Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-9uc55z3g88r47exde7zxjm6p@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Print cache misses as percentageIngo Molnar
Before: 113,393,041 cache-references # 83.636 M/sec 7,052,454 cache-misses # 5.202 M/sec After: 112,589,441 cache-references # 87.925 M/sec 6,556,354 cache-misses # 5.823 % misses/hits percentages are more expressive than absolute numbers or rates. (Also prettify the CPUs printout line to not have a trailing whitespace.) Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-axm28f43x439bl41zkvfzd63@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-26perf stat: Print stalled cycles percentageIngo Molnar
Print: 611,527 cycles 400,553 instructions # ( 0.71 instructions per cycle ) 77,809 stalled-cycles # ( 12.71% of all cycles ) 0.000610987 seconds time elapsed Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Link: http://lkml.kernel.org/n/tip-fd6x8r1cpyb6zhlrc4ix8m45@git.kernel.org
2011-04-15perf evsel: Fix use of inheritArnaldo Carvalho de Melo
perf stat doesn't mmap and its perfectly fine for it to use task-bound counters with inheritance. So set the attr.inherit on the caller and leave the syscall itself to validate it. When the mmap fails perf_evlist__mmap will just emit a warning if this is the failure reason. Reported-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> Link: http://lkml.kernel.org/r/20110414170121.GC3229@ghostprotocols.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-03-14perf stat: Provide support for filtersFrederic Weisbecker
Now the --filter option is usable with perf stat too. Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> LKML-Reference: <1300117230-8404-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-02-16perf tool: Add cgroup supportStephane Eranian
This patch adds the ability to filter monitoring based on container groups (cgroups) for both perf stat and perf record. It is possible to monitor multiple cgroup in parallel. There is one cgroup per event. The cgroups to monitor are passed via a new -G option followed by a comma separated list of cgroup names. The cgroup filesystem has to be mounted. Given a cgroup name, the perf tool finds the corresponding directory in the cgroup filesystem and opens it. It then passes that file descriptor to the kernel. Example: $ perf stat -B -a -e cycles:u,cycles:u,cycles:u -G test1,,test2 -- sleep 1 Performance counter stats for 'sleep 1': 2,368,667,414 cycles test1 2,369,661,459 cycles <not counted> cycles test2 1.001856890 seconds time elapsed Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <4d590290.825bdf0a.7d0a.4890@mx.google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-02-01perf stat: Fix up resource release orderArnaldo Carvalho de Melo
That was causing a SEGV on selected old distros. Problem introduced in 7e2ed09. Reported-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-31perf evlist: Store pointer to the cpu and thread mapsArnaldo Carvalho de Melo
So that we don't have to pass it around to the several methods that needs it, simplifying usage. There is one case where we don't have the thread/cpu map in advance, which is in the parsing routines used by top, stat, record, that we have to wait till all options are parsed to know if a cpu or thread list was passed to then create those maps. For that case consolidate the cpu and thread map creation via perf_evlist__create_maps() out of the code in top and record, while also providing a perf_evlist__set_maps() for cases where multiple evlists share maps or for when maps that represent CPU sockets, for instance, get crafted out of topology information or subsets of threads in a particular application are to be monitored, providing more granularity in specifying which cpus and threads to monitor. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-24perf threads: Move thread_map to separate fileArnaldo Carvalho de Melo
To untangle it from struct thread handling, that is tied to symbols, etc. Right now in the python bindings I'm working on I need just a subset of the util/ files, untangling it allows me to do that. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-22perf evsel: Allow specifying if the inherit bit should be setArnaldo Carvalho de Melo
As this is a per-cpu attribute, we can't set it up in advance and use it for all the calls. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-22perf evsel: Support event groupsArnaldo Carvalho de Melo
The perf_evsel__open now have an extra boolean argument specifying if event grouping is desired. The first file descriptor created on a CPU becomes the group leader. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-22perf evsel: Introduce perf_evlistArnaldo Carvalho de Melo
Killing two more perf wide global variables: nr_counters and evsel_list as a list_head. There are more operations that will need more fields in perf_evlist, like the pollfd for polling all the fds in a list of evsel instances. Use option->value to pass the evsel_list to parse_{events,filters}. LKML-Reference: <new-submission> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-22perf tools: Fix 64 bit integer format stringsArnaldo Carvalho de Melo
Using %L[uxd] has issues in some architectures, like on ppc64. Fix it by making our 64 bit integers typedefs of stdint.h types and using PRI[ux]64 like, for instance, git does. Reported by Denis Kirjanov that provided a patch for one case, I went and changed all cases. Reported-by: Denis Kirjanov <dkirjanov@kernel.org> Tested-by: Denis Kirjanov <dkirjanov@kernel.org> LKML-Reference: <20110120093246.GA8031@hera.kernel.org> Cc: Denis Kirjanov <dkirjanov@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Pingtian Han <phan@redhat.com> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-11perf evsel: Fix order of event list deletionArnaldo Carvalho de Melo
We need to defer calling perf_evsel_list__delete() till after atexit registered routines, because we need to traverse the events being recorded at that time at least on 'perf record'. This fixes the problem reported by Thomas Renninger where cmd_record called by cmd_timechart would not write the tracing data to the perf.data file header because the evsel_list at atexit (control+C on 'perf timechart record') time would be empty, being already deleted by run_builtin(), and thus 'perf timechart' when trying to process such perf.data file would die with: "no trace data in the file" Problem introduced in 70d544d. Reported-by: Thomas Renninger <trenn@suse.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Renninger <trenn@suse.de> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-10perf stat: better error message for unsupported eventsDavid Ahern
For unsupported events (e.g., H/W events when running in a VM) perf stat currently fails with the error message: Error: open_counter returned with 2 (No such file or directory). /bin/dmesg may provide additional information. Fatal: Not all events could be opened. dmesg is of no help and it is not clear as to why it fails to open the counter. This patch changes the error message to Error: cache-misses event is not supported. Fatal: Not all events could be opened. Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: a.p.zijlstra@chello.nl LPU-Reference: <1294597272-17335-1-git-send-email-daahern@cisco.com> Signed-off-by: David Ahern <daahern@cisco.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-07perf tools: Pass whole attr to event selectorsLin Ming
Since commit 69aad6f1(perf tools: Introduce event selectors), only perf_event_attr::type and ::config are passed to event selector, which makes perf tool not work correctly. For example, PEBS does not work because perf_event_attr::precise_ip is not passed to the syscall. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <1294369869.20563.19.camel@minggr.sh.intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-04perf evsel: Use {cpu,thread}_map to shorten list of parametersArnaldo Carvalho de Melo
Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-04perf tools: Refactor all_tids to hold nr and the mapArnaldo Carvalho de Melo
So that later, we can pass the thread_map instance instead of (thread_num, thread_map) for things like perf_evsel__open and friends, just like was done with cpu_map. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-04perf tools: Refactor cpumap to hold nr and the mapArnaldo Carvalho de Melo
So that later, we can pass the cpu_map instance instead of (nr_cpus, cpu_map) for things like perf_evsel__open and friends. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-04perf evsel: Introduce per cpu and per thread open helpersArnaldo Carvalho de Melo
Abstracting away the loops needed to create the various event fd handlers. The users have to pass a confiruged perf->evsel.attr field, which is already usable after perf_evsel__new (constructor) time, using defaults. Comes out of the ad-hoc routines in builtin-stat, that now uses it. Fixed a small silly bug where we were die()ing before killing our children, dysfunctional family this one 8-) Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-04perf evsel: Steal the counter reading routines from statArnaldo Carvalho de Melo
Making them hopefully generic enough to be used in 'perf test', well see. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-03perf evsel: Delete the event selectors at exitArnaldo Carvalho de Melo
Freeing all the possibly allocated resources, reducing complexity on each tool exit path. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-03perf evsel: Adopt MATCH_EVENT macro from 'stat'Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-01-03perf tools: Introduce event selectorsArnaldo Carvalho de Melo
Out of ad-hoc code and global arrays with hard coded sizes. This is the first step on having a library that will be first used on regression tests in the 'perf test' tool. [acme@felicio linux]$ size /tmp/perf.before text data bss dec hex filename 1273776 97384 5104416 6475576 62cf38 /tmp/perf.before [acme@felicio linux]$ size /tmp/perf.new text data bss dec hex filename 1275422 97416 1392416 2765254 2a31c6 /tmp/perf.new Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-12-01perf stat: Add csv-style outputStephane Eranian
This patch adds an option (-x/--field-separator) to print counts using a CSV-style output. The user can pass a custom separator. This makes it very easy to import counts directly into your favorite spreadsheet without having to write scripts. Example: $ perf stat --field-separator=, -a -- sleep 1 4009.961740,task-clock-msecs 13,context-switches 2,CPU-migrations 189,page-faults 9596385684,cycles 3493659441,instructions 872897069,branches 41562,branch-misses 22424,cache-references 1289,cache-misses Works also in non-aggregated mode: $ perf stat -x , -a -A -- sleep 1 CPU0,1002.526168,task-clock-msecs CPU1,1002.528365,task-clock-msecs CPU2,1002.523360,task-clock-msecs CPU3,1002.519878,task-clock-msecs CPU0,1,context-switches CPU1,5,context-switches CPU2,5,context-switches CPU3,6,context-switches CPU0,0,CPU-migrations CPU1,1,CPU-migrations CPU2,0,CPU-migrations CPU3,1,CPU-migrations CPU0,2,page-faults CPU1,6,page-faults CPU2,9,page-faults CPU3,174,page-faults CPU0,2399439771,cycles CPU1,2380369063,cycles CPU2,2399142710,cycles CPU3,2373161192,cycles CPU0,872900618,instructions CPU1,873030960,instructions CPU2,872714525,instructions CPU3,874460580,instructions CPU0,221556839,branches CPU1,218134342,branches CPU2,218161730,branches CPU3,218284093,branches CPU0,18556,branch-misses CPU1,1449,branch-misses CPU2,3447,branch-misses CPU3,12714,branch-misses CPU0,8330,cache-references CPU1,313844,cache-references CPU2,47993728,cache-references CPU3,826481,cache-references CPU0,272,cache-misses CPU1,5360,cache-misses CPU2,1342193,cache-misses CPU3,13992,cache-misses This second version adds the ability to name a separator and uses field-separator as the long option to be consistent with perf report. Commiter note: Since we enabled --big-num by default in 201e0b0 and -x can't be used with it, we need to notice if the user explicitely enabled or disabled -B, add code to disable big_num if the user didn't explicitely set --big_num when -x is used. Cc: David S. Miller <davem@davemloft.net> Cc: Frederik Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: paulus@samba.org Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <robert.richter@amd.com> LKML-Reference: <4cf68aa7.0fedd80a.5294.1203@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-12-01perf stat: Use --big-num format by defaultArnaldo Carvalho de Melo
[acme@mica linux]$ perf stat ls > /dev/null Performance counter stats for 'ls': 1.512532 task-clock-msecs # 0.801 CPUs 2 context-switches # 0.001 M/sec 0 CPU-migrations # 0.000 M/sec 241 page-faults # 0.159 M/sec 2,973,331 cycles # 1965.797 M/sec 1,460,802 instructions # 0.491 IPC 314,642 branches # 208.023 M/sec 18,475 branch-misses # 5.872 % <not counted> cache-references <not counted> cache-misses 0.001887676 seconds time elapsed To get the previous behaviour just use --no-big-num: [acme@mica linux]$ perf stat --no-big-num ls > /dev/null Performance counter stats for 'ls': 1.468014 task-clock-msecs # 0.795 CPUs 1 context-switches # 0.001 M/sec 0 CPU-migrations # 0.000 M/sec 241 page-faults # 0.164 M/sec 2900254 cycles # 1975.631 M/sec 1437991 instructions # 0.496 IPC 310905 branches # 211.786 M/sec 17912 branch-misses # 5.761 % <not counted> cache-references <not counted> cache-misses 0.001845435 seconds time elapsed [acme@mica linux]$ Suggested-by: Ingo Molnar <mingo@elte.hu> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Stephane Eranian <eranian@google.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-11-20perf stat: Change and clean up sys_perf_event_open error handlingCorey Ashford
This patch makes several changes to "perf stat": - "perf stat" will no longer go ahead and run the application when one or more of the specified events could not be opened. - Use error() and die() instead of pr_err() so that the output is more consistent with "perf top" and "perf record". - Handle permission errors in a more robust way, and in a similar way to "perf record" and "perf top". In addition, the sys_perf_event_open() error handling of "perf top" and "perf record" is made more consistent and adds the following phrase when an event doesn't open (with something ther than an access or permission error): "/bin/dmesg may provide additional information." This is added because kernel code doesn't have a good way of expressing detailed errors to user space, so its only avenue is to use printk's. However, many users may not think of looking at dmesg to find out why an event is being rejected. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <fweisbec@gmail.com> Cc: Ian Munsie <ianmunsi@au1.ibm.com> Cc: Michael Ellerman <michaele@au1.ibm.com> LKML-Reference: <1290217044-26293-1-git-send-email-cjashfor@linux.vnet.ibm.com> Signed-off-by: Corey Ashford <cjashfor@linux.vnet.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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