Messages in this thread | | | Subject | Re: [PATCH 43/49] perf stat: Add default hybrid events | From | "Jin, Yao" <> | Date | Tue, 9 Feb 2021 08:36:36 +0800 |
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Hi Arnaldo,
On 2/9/2021 3:10 AM, Arnaldo Carvalho de Melo wrote: > Em Mon, Feb 08, 2021 at 07:25:40AM -0800, kan.liang@linux.intel.com escreveu: >> From: Jin Yao <yao.jin@linux.intel.com> >> >> Previously if '-e' is not specified in perf stat, some software events >> and hardware events are added to evlist by default. >> >> root@otcpl-adl-s-2:~# ./perf stat -- ./triad_loop >> >> Performance counter stats for './triad_loop': >> >> 109.43 msec task-clock # 0.993 CPUs utilized >> 1 context-switches # 0.009 K/sec >> 0 cpu-migrations # 0.000 K/sec >> 105 page-faults # 0.960 K/sec >> 401,161,982 cycles # 3.666 GHz >> 1,601,216,357 instructions # 3.99 insn per cycle >> 200,217,751 branches # 1829.686 M/sec >> 14,555 branch-misses # 0.01% of all branches >> >> 0.110176860 seconds time elapsed >> >> Among the events, cycles, instructions, branches and branch-misses >> are hardware events. >> >> One hybrid platform, two events are created for one hardware event. >> >> core cycles, >> atom cycles, >> core instructions, >> atom instructions, >> core branches, >> atom branches, >> core branch-misses, >> atom branch-misses >> >> These events will be added to evlist in order on hybrid platform >> if '-e' is not set. >> >> Since parse_events() has been supported to create two hardware events >> for one event on hybrid platform, so we just use parse_events(evlist, >> "cycles,instructions,branches,branch-misses") to create the default >> events and add them to evlist. >> >> After: >> root@otcpl-adl-s-2:~# ./perf stat -vv -- taskset -c 16 ./triad_loop >> ... >> ------------------------------------------------------------ >> perf_event_attr: >> type 1 >> size 120 >> config 0x1 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 3 >> ------------------------------------------------------------ >> perf_event_attr: >> type 1 >> size 120 >> config 0x3 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 4 >> ------------------------------------------------------------ >> perf_event_attr: >> type 1 >> size 120 >> config 0x4 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 5 >> ------------------------------------------------------------ >> perf_event_attr: >> type 1 >> size 120 >> config 0x2 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 7 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0x400000000 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 8 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0xa00000000 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 9 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0x400000001 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 10 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0xa00000001 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 11 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0x400000004 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 12 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0xa00000004 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 13 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0x400000005 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 14 >> ------------------------------------------------------------ >> perf_event_attr: >> type 6 >> size 120 >> config 0xa00000005 >> sample_type IDENTIFIER >> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING >> disabled 1 >> inherit 1 >> enable_on_exec 1 >> exclude_guest 1 >> ------------------------------------------------------------ >> ... >> >> Performance counter stats for 'taskset -c 16 ./triad_loop': >> >> 201.31 msec task-clock # 0.997 CPUs utilized >> 1 context-switches # 0.005 K/sec >> 1 cpu-migrations # 0.005 K/sec >> 166 page-faults # 0.825 K/sec >> 623,267,134 cycles # 3096.043 M/sec (0.16%) >> 603,082,383 cycles # 2995.777 M/sec (99.84%) >> 406,410,481 instructions # 2018.820 M/sec (0.16%) >> 1,604,213,375 instructions # 7968.837 M/sec (99.84%) >> 81,444,171 branches # 404.569 M/sec (0.16%) >> 200,616,430 branches # 996.550 M/sec (99.84%) >> 3,769,856 branch-misses # 18.727 M/sec (0.16%) >> 16,111 branch-misses # 0.080 M/sec (99.84%) >> >> 0.201895853 seconds time elapsed >> >> We can see two events are created for one hardware event. >> First one is core event the second one is atom event. > > Can we have that (core/atom) as a prefix or in the comment area? >
In next patch "perf stat: Uniquify hybrid event name", it would tell user the pmu which the event belongs to.
For example, I run the triad_loop on core cpu,
root@ssp-pwrt-002:# ./perf stat -- taskset -c 0 ./triad_loop
Performance counter stats for 'taskset -c 0 ./triad_loop':
287.87 msec task-clock # 0.990 CPUs utilized 30 context-switches # 0.104 K/sec 1 cpu-migrations # 0.003 K/sec 168 page-faults # 0.584 K/sec 450,089,808 cycles [cpu_core] # 1563.496 M/sec <not counted> cycles [cpu_atom] (0.00%) 1,602,536,074 instructions [cpu_core] # 5566.797 M/sec <not counted> instructions [cpu_atom] (0.00%) 200,474,560 branches [cpu_core] # 696.397 M/sec <not counted> branches [cpu_atom] (0.00%) 23,002 branch-misses [cpu_core] # 0.080 M/sec <not counted> branch-misses [cpu_atom] (0.00%)
We can see cpu_atom is not counted.
Thanks Jin Yao
>> One thing is, the shadow stats looks a bit different, now it's just >> 'M/sec'. >> >> The perf_stat__update_shadow_stats and perf_stat__print_shadow_stats >> need to be improved in future if we want to get the original shadow >> stats. >> >> Reviewed-by: Andi Kleen <ak@linux.intel.com> >> Signed-off-by: Jin Yao <yao.jin@linux.intel.com> >> --- >> tools/perf/builtin-stat.c | 22 ++++++++++++++++++++++ >> 1 file changed, 22 insertions(+) >> >> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c >> index 44d1a5f..0b08665 100644 >> --- a/tools/perf/builtin-stat.c >> +++ b/tools/perf/builtin-stat.c >> @@ -1137,6 +1137,13 @@ static int parse_hybrid_type(const struct option *opt, >> return 0; >> } >> >> +static int add_default_hybrid_events(struct evlist *evlist) >> +{ >> + struct parse_events_error err; >> + >> + return parse_events(evlist, "cycles,instructions,branches,branch-misses", &err); >> +} >> + >> static struct option stat_options[] = { >> OPT_BOOLEAN('T', "transaction", &transaction_run, >> "hardware transaction statistics"), >> @@ -1613,6 +1620,12 @@ static int add_default_attributes(void) >> { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES }, >> >> }; >> + struct perf_event_attr default_sw_attrs[] = { >> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK }, >> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES }, >> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS }, >> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS }, >> +}; >> >> /* >> * Detailed stats (-d), covering the L1 and last level data caches: >> @@ -1849,6 +1862,15 @@ static int add_default_attributes(void) >> } >> >> if (!evsel_list->core.nr_entries) { >> + perf_pmu__scan(NULL); >> + if (perf_pmu__hybrid_exist()) { >> + if (evlist__add_default_attrs(evsel_list, >> + default_sw_attrs) < 0) { >> + return -1; >> + } >> + return add_default_hybrid_events(evsel_list); >> + } >> + >> if (target__has_cpu(&target)) >> default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK; >> >> -- >> 2.7.4 >> >
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