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493be70ac3
linux/tools/perf
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Jin Yao 493be70ac3 perf stat: Disable the NMI watchdog message on hybrid 
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>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210610034557.29766-1-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-07-07 11:37:23 -03:00
..
arch tools headers UAPI: Sync files changed by the quotactl_fd new syscall 2021-07-05 14:36:22 -03:00
bench perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
Documentation perf dlfilter: Add object_code() to perf_dlfilter_fns 2021-07-01 16:14:38 -03:00
examples/bpf perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
include/bpf
jvmti perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
pmu-events perf vendor events power10: Adds 24x7 nest metric events for power10 platform 2021-07-07 11:35:49 -03:00
python tweewide: Fix most Shebang lines 2020-12-08 23:30:04 +09:00
scripts perf scripting python: intel-pt-events.py: Add --insn-trace and --src-trace 2021-06-01 10:05:20 -03:00
tests perf test: Pass the verbose option to shell tests 2021-06-22 14:52:09 -03:00
trace perf beauty: Update copy of linux/socket.h with the kernel sources 2021-06-19 10:09:08 -03:00
ui perf annotate: Fix 's' on source line when disasm is empty 2021-07-07 10:28:10 -03:00
util perf stat: Disable the NMI watchdog message on hybrid 2021-07-07 11:37:23 -03:00
.gitignore perf: Update .gitignore file 2021-04-20 08:40:20 -03:00
Build perf daemon: Add daemon command 2021-02-09 15:42:57 -03:00
builtin-annotate.c perf annotate: Add itrace options support 2021-06-16 15:07:42 -03:00
builtin-bench.c perf bench: Add build-id injection benchmark 2020-10-13 10:59:42 -03:00
builtin-buildid-cache.c perf buildid-cache: Add --debuginfod option to specify a server to fetch debug files 2020-12-28 12:20:39 -03:00
builtin-buildid-list.c perf buildid-list: Initialize zstd_data 2021-05-17 20:39:17 -03:00
builtin-c2c.c perf c2c: Support record for hybrid platform 2021-06-01 11:06:35 -03:00
builtin-config.c
builtin-daemon.c Merge remote-tracking branch 'torvalds/master' into perf/core 2021-03-29 10:39:10 -03:00
builtin-data.c perf data: Add JSON export 2021-04-29 10:30:58 -03:00
builtin-diff.c perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
builtin-evlist.c perf evlist: Support pipe mode display 2020-12-17 14:36:17 -03:00
builtin-ftrace.c perf ftrace: Fix access to pid in array when setting a pid filter 2021-04-23 15:58:10 -03:00
builtin-help.c
builtin-inject.c perf inject: Do not inject BUILD_ID record if MMAP2 has it 2021-05-26 09:38:53 -03:00
builtin-kallsyms.c
builtin-kmem.c perf evlist: Use the right prefix for 'struct evlist' 'find' methods 2020-11-30 09:48:07 -03:00
builtin-kvm.c perf evlist: Use the right prefix for 'struct evlist' mmap pages parsing method 2020-11-30 15:15:30 -03:00
builtin-list.c
builtin-lock.c perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
builtin-mem.c perf mem: Fix wrong verbose output for recording events 2021-06-01 11:05:30 -03:00
builtin-probe.c perf probe: Do not show @plt function by default 2021-07-07 10:28:10 -03:00
builtin-record.c Merge remote-tracking branch 'torvalds/master' into perf/core 2021-06-22 13:56:50 -03:00
builtin-report.c perf report: Fix --task and --stat with pipe input 2021-07-05 14:16:57 -03:00
builtin-sched.c perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
builtin-script.c perf script: Add option to pass arguments to dlfilters 2021-07-01 16:14:37 -03:00
builtin-stat.c perf stat: Skip evlist__[enable|disable] when all events uses BPF 2021-05-21 16:50:17 -03:00
builtin-timechart.c
builtin-top.c perf top: Add cgroup support for perf top (-G) 2021-06-24 15:33:35 -03:00
builtin-trace.c perf trace: Fix race in signal handling 2021-03-06 16:54:32 -03:00
builtin-version.c perf version: Add a feature for libpfm4 2020-11-04 09:42:40 -03:00
builtin.h perf daemon: Add daemon command 2021-02-09 15:42:57 -03:00
check-headers.sh perf tools: Copy uapi/asm/perf_regs.h from the kernel for MIPS 2021-06-01 10:07:46 -03:00
command-list.txt perf stat: Enable iostat mode for x86 platforms 2021-04-20 08:40:20 -03:00
CREDITS
design.txt
Makefile perf tools: Add a build-test variant to use in builds from a tarball 2021-04-20 08:43:58 -03:00
Makefile.config perf build: Install perf_dlfilter.h 2021-07-01 16:14:38 -03:00
Makefile.perf perf trace: Fix the perf trace link location 2021-07-07 10:28:10 -03:00
MANIFEST scripts/bpf: Abstract eBPF API target parameter 2021-03-04 18:39:45 -08:00
perf-archive.sh perf archive: Fix filtering of empty build-ids 2021-03-06 16:54:31 -03:00
perf-completion.sh
perf-iostat.sh perf stat: Enable iostat mode for x86 platforms 2021-04-20 08:40:20 -03:00
perf-read-vdso.c
perf-sys.h perf tests: Call test_attr__open() directly 2020-09-10 11:55:37 -03:00
perf-with-kcore.sh
perf.c perf debug: Move debug initialization earlier 2021-05-27 13:24:22 -03:00
perf.h