linux

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Kan Liang 3612ca8e29 perf stat: Fix the hard-coded metrics calculation on the hybrid

The hard-coded metrics is wrongly calculated on the hybrid machine.

$ perf stat -e cycles,instructions -a sleep 1

 Performance counter stats for 'system wide':

        18,205,487      cpu_atom/cycles/
         9,733,603      cpu_core/cycles/
         9,423,111      cpu_atom/instructions/     #  0.52  insn per cycle
         4,268,965      cpu_core/instructions/     #  0.23  insn per cycle

The insn per cycle for cpu_core should be 4,268,965 / 9,733,603 = 0.44.

When finding the metric events, the find_stat() doesn't take the PMU
type into account. The cpu_atom/cycles/ is wrongly used to calculate
the IPC of the cpu_core.

In the hard-coded metrics, the events from a different PMU are only
SW_CPU_CLOCK and SW_TASK_CLOCK. They both have the stat type,
STAT_NSECS. Except the SW CLOCK events, check the PMU type as well.

Fixes: 0a57b910807a ("perf stat: Use counts rather than saved_value")
Reported-by: Khalil, Amiri <amiri.khalil@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240606180316.4122904-1-kan.liang@linux.intel.com

2024-06-21 09:43:09 -07:00

accounting

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arch

perf tools fixes and improvements for v6.10:

2024-05-21 15:45:14 -07:00

bootconfig

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bpf

bpftool, selftests/hid/bpf: Fix 29 clang warnings

2024-05-06 14:39:36 -07:00

build