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| author | John Kacur <jkacur@redhat.com> | 2024-05-10 22:03:18 +0300 |
|---|---|---|
| committer | Daniel Bristot de Oliveira <bristot@kernel.org> | 2024-05-16 17:45:40 +0300 |
| commit | 01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608 (patch) | |
| tree | a4ba261c43cddf94e1868d74b8a173d3ad96089f /Documentation/tools/rtla/common_osnoise_options.rst | |
| parent | e9a4062e1527238c5649d0f4be794a8566fd77c9 (diff) | |
| download | linux-01b05fc0e5f3aec443a9a8ffa0022cbca2fd3608.tar.xz | |
rtla/timerlat: Fix histogram report when a cpu count is 0
On short runs it is possible to get no samples on a cpu, like this:
# rtla timerlat hist -u -T50
Index IRQ-001 Thr-001 Usr-001 IRQ-002 Thr-002 Usr-002
2 1 0 0 0 0 0
33 0 1 0 0 0 0
36 0 0 1 0 0 0
49 0 0 0 1 0 0
52 0 0 0 0 1 0
over: 0 0 0 0 0 0
count: 1 1 1 1 1 0
min: 2 33 36 49 52 18446744073709551615
avg: 2 33 36 49 52 -
max: 2 33 36 49 52 0
rtla timerlat hit stop tracing
IRQ handler delay: (exit from idle) 48.21 us (91.09 %)
IRQ latency: 49.11 us
Timerlat IRQ duration: 2.17 us (4.09 %)
Blocking thread: 1.01 us (1.90 %)
swapper/2:0 1.01 us
------------------------------------------------------------------------
Thread latency: 52.93 us (100%)
Max timerlat IRQ latency from idle: 49.11 us in cpu 2
Note, the value 18446744073709551615 is the same as ~0.
Fix this by reporting no results for the min, avg and max if the count
is 0.
Link: https://lkml.kernel.org/r/20240510190318.44295-1-jkacur@redhat.com
Cc: stable@vger.kernel.org
Fixes: 1eeb6328e8b3 ("rtla/timerlat: Add timerlat hist mode")
Suggested-by: Daniel Bristot de Oliveria <bristot@kernel.org>
Signed-off-by: John Kacur <jkacur@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Diffstat (limited to 'Documentation/tools/rtla/common_osnoise_options.rst')
0 files changed, 0 insertions, 0 deletions