Messages in this thread | | | Subject | Re: [PATCH v3] perf stat: Disable NMI watchdog message on hybrid | From | "Jin, Yao" <> | Date | Tue, 6 Jul 2021 10:19:47 +0800 |
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Hi Jiri,
On 6/10/2021 11:45 AM, Jin Yao wrote: > If we run a single workload that only runs on big core, there is always a > ugly message about disabling the NMI watchdog because the atom is not > counted. > > Before: > > # ./perf stat true > > Performance counter stats for 'true': > > 0.43 msec task-clock # 0.396 CPUs utilized > 0 context-switches # 0.000 /sec > 0 cpu-migrations # 0.000 /sec > 45 page-faults # 103.918 K/sec > 639,634 cpu_core/cycles/ # 1.477 G/sec > <not counted> cpu_atom/cycles/ (0.00%) > 643,498 cpu_core/instructions/ # 1.486 G/sec > <not counted> cpu_atom/instructions/ (0.00%) > 123,715 cpu_core/branches/ # 285.694 M/sec > <not counted> cpu_atom/branches/ (0.00%) > 4,094 cpu_core/branch-misses/ # 9.454 M/sec > <not counted> cpu_atom/branch-misses/ (0.00%) > > 0.001092407 seconds time elapsed > > 0.001144000 seconds user > 0.000000000 seconds sys > > Some events weren't counted. Try disabling the NMI watchdog: > echo 0 > /proc/sys/kernel/nmi_watchdog > perf stat ... > echo 1 > /proc/sys/kernel/nmi_watchdog > > # ./perf stat -e '{cpu_atom/cycles/,msr/tsc/}' true > > Performance counter stats for 'true': > > <not counted> cpu_atom/cycles/ (0.00%) > <not counted> msr/tsc/ (0.00%) > > 0.001904106 seconds time elapsed > > 0.001947000 seconds user > 0.000000000 seconds sys > > Some events weren't counted. Try disabling the NMI watchdog: > echo 0 > /proc/sys/kernel/nmi_watchdog > perf stat ... > echo 1 > /proc/sys/kernel/nmi_watchdog > The events in group usually have to be from the same PMU. Try reorganizing the group. > > Now we disable the NMI watchdog message on hybrid, otherwise there > are too many false positives. > > After: > > # ./perf stat true > > Performance counter stats for 'true': > > 0.79 msec task-clock # 0.419 CPUs utilized > 0 context-switches # 0.000 /sec > 0 cpu-migrations # 0.000 /sec > 48 page-faults # 60.889 K/sec > 777,692 cpu_core/cycles/ # 986.519 M/sec > <not counted> cpu_atom/cycles/ (0.00%) > 669,147 cpu_core/instructions/ # 848.828 M/sec > <not counted> cpu_atom/instructions/ (0.00%) > 128,635 cpu_core/branches/ # 163.176 M/sec > <not counted> cpu_atom/branches/ (0.00%) > 4,089 cpu_core/branch-misses/ # 5.187 M/sec > <not counted> cpu_atom/branch-misses/ (0.00%) > > 0.001880649 seconds time elapsed > > 0.001935000 seconds user > 0.000000000 seconds sys > > # ./perf stat -e '{cpu_atom/cycles/,msr/tsc/}' true > > Performance counter stats for 'true': > > <not counted> cpu_atom/cycles/ (0.00%) > <not counted> msr/tsc/ (0.00%) > > 0.000963319 seconds time elapsed > > 0.000999000 seconds user > 0.000000000 seconds sys > > Signed-off-by: Jin Yao <yao.jin@linux.intel.com> > --- > v3: > - Use evlist__has_hybrid() to check there is at least one hybrid > event in evlist. > > v2: > - If the group was mixed with hybrid event and non-hybrid event, > the NMI watchdog message was still reported. V2 adds checking > for hybrid event mixed group. > > tools/perf/util/stat-display.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c > index b759dfd633b4..55ae0d1705a9 100644 > --- a/tools/perf/util/stat-display.c > +++ b/tools/perf/util/stat-display.c > @@ -19,6 +19,7 @@ > #include "util.h" > #include "iostat.h" > #include "pmu-hybrid.h" > +#include "evlist-hybrid.h" > > #define CNTR_NOT_SUPPORTED "<not supported>" > #define CNTR_NOT_COUNTED "<not counted>" > @@ -465,9 +466,11 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int > config->csv_sep); > > if (counter->supported) { > - config->print_free_counters_hint = 1; > - if (is_mixed_hw_group(counter)) > - config->print_mixed_hw_group_error = 1; > + if (!evlist__has_hybrid(counter->evlist)) { > + config->print_free_counters_hint = 1; > + if (is_mixed_hw_group(counter)) > + config->print_mixed_hw_group_error = 1; > + } > } > > fprintf(config->output, "%-*s%s", >
Any comments for v3?
Thanks Jin Yao
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