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d53b499658
The IDs are associated with perf events and not applicable to non-perf
event PMUs. The failure to generate the ids was causing perf stat
record to fail.
```
$ perf stat record -a sleep 1
Performance counter stats for 'system wide':
47,941 context-switches # nan cs/sec cs_per_second
0.00 msec cpu-clock # 0.0 CPUs CPUs_utilized
3,261 cpu-migrations # nan migrations/sec migrations_per_second
516 page-faults # nan faults/sec page_faults_per_second
7,525,483 cpu_core/branch-misses/ # 2.3 % branch_miss_rate
322,069,004 cpu_core/branches/ # nan M/sec branch_frequency
1,895,684,291 cpu_core/cpu-cycles/ # nan GHz cycles_frequency
2,789,777,426 cpu_core/instructions/ # 1.5 instructions insn_per_cycle
7,074,765 cpu_atom/branch-misses/ # 3.2 % branch_miss_rate (49.89%)
224,225,412 cpu_atom/branches/ # nan M/sec branch_frequency (50.29%)
2,061,679,981 cpu_atom/cpu-cycles/ # nan GHz cycles_frequency (50.33%)
2,011,242,533 cpu_atom/instructions/ # 1.0 instructions insn_per_cycle (50.33%)
TopdownL1 (cpu_core) # 9.0 % tma_bad_speculation
# 28.3 % tma_frontend_bound
# 35.2 % tma_backend_bound
# 27.5 % tma_retiring
TopdownL1 (cpu_atom) # 36.8 % tma_backend_bound (59.65%)
# 22.8 % tma_frontend_bound (59.60%)
# 11.6 % tma_bad_speculation
# 28.8 % tma_retiring (59.59%)
1.006777519 seconds time elapsed
$ perf stat report
Performance counter stats for 'perf':
1,013,376,154 duration_time
<not counted> duration_time
<not counted> duration_time
<not counted> duration_time
<not counted> duration_time
<not counted> duration_time
47,941 context-switches
0.00 msec cpu-clock
3,261 cpu-migrations
516 page-faults
7,525,483 cpu_core/branch-misses/
322,069,814 cpu_core/branches/
322,069,004 cpu_core/branches/
1,895,684,291 cpu_core/cpu-cycles/
1,895,679,209 cpu_core/cpu-cycles/
2,789,777,426 cpu_core/instructions/
<not counted> cpu_core/cpu-cycles/
<not counted> cpu_core/stalled-cycles-frontend/
<not counted> cpu_core/cpu-cycles/
<not counted> cpu_core/stalled-cycles-backend/
<not counted> cpu_core/stalled-cycles-backend/
<not counted> cpu_core/instructions/
<not counted> cpu_core/stalled-cycles-frontend/
7,074,765 cpu_atom/branch-misses/ (49.89%)
221,679,088 cpu_atom/branches/ (49.89%)
224,225,412 cpu_atom/branches/ (50.29%)
2,061,679,981 cpu_atom/cpu-cycles/ (50.33%)
2,016,259,567 cpu_atom/cpu-cycles/ (50.33%)
2,011,242,533 cpu_atom/instructions/ (50.33%)
<not counted> cpu_atom/cpu-cycles/
<not counted> cpu_atom/stalled-cycles-frontend/
<not counted> cpu_atom/cpu-cycles/
<not counted> cpu_atom/stalled-cycles-backend/
<not counted> cpu_atom/stalled-cycles-backend/
<not counted> cpu_atom/instructions/
<not counted> cpu_atom/stalled-cycles-frontend/
17,145,113 cpu_core/INT_MISC.UOP_DROPPING/
10,594,226,100 cpu_core/TOPDOWN.SLOTS/
2,919,021,401 cpu_core/topdown-retiring/
943,101,838 cpu_core/topdown-bad-spec/
3,031,152,533 cpu_core/topdown-fe-bound/
3,739,756,791 cpu_core/topdown-be-bound/
1,909,501,648 cpu_atom/CPU_CLK_UNHALTED.CORE/ (60.04%)
3,516,608,359 cpu_atom/TOPDOWN_BE_BOUND.ALL/ (59.65%)
2,179,403,876 cpu_atom/TOPDOWN_FE_BOUND.ALL/ (59.60%)
2,745,732,458 cpu_atom/TOPDOWN_RETIRING.ALL/ (59.59%)
1.006777519 seconds time elapsed
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
```
Reported-by: James Clark <james.clark@linaro.org>
Closes: https://lore.kernel.org/lkml/ca0f0cd3-7335-48f9-8737-2f70a75b019a@linaro.org/
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.