pá 17. 1. 2025 v 2:18 odesílatel Steven Rostedt <[email protected]> napsal:
> I tested this out, and it failed the last test:
>
Thank you for testing this.
> make[1]: Leaving directory '/work/git/linux.git/tools/tracing/rtla'
> RTLA=/work/git/linux.git/tools/tracing/rtla/rtla prove -o -f tests/
> tests/hwnoise.t ... ok
> tests/osnoise.t ... ok
> tests/timerlat.t .. 9/9
> not ok 9 - hist test in nanoseconds
> #
> tests/timerlat.t .. Failed 1/9 subtests
>
> Test Summary Report
> -------------------
> tests/timerlat.t (Wstat: 0 Tests: 9 Failed: 1)
> Failed test: 9
> Files=3, Tests=20, 451 wallclock secs ( 0.07 usr 0.11 sys + 10.57 cusr 74.09
> csys = 84.84 CPU)
> Result: FAIL
> make: *** [Makefile:89: check] Error 1
>
>
I have not seen this when testing the patch. It looks like rtla exits
without any output, I will send a v2 that makes the test engine print
the error code in that case, it will be useful not only for this.
That being said, it's not like nanosecond resolution rtla-timerlat is
without bugs:
# RTLA timerlat histogram
# Time unit is nanoseconds (ns)
# Duration: 0 00:00:02
Index IRQ-000 Thr-000 Usr-000
over: 1 0 0
count: 1 0 0
min: 6102 - -
avg: 6102 - -
max: 6102 - -
ALL: IRQ Thr Usr
count: 1 0 0
min: 6102 - -
avg: 6102 - -
max: 6102 - -
rtla timerlat hit stop tracing
## CPU 0 hit stop tracing, analyzing it ##
IRQ handler delay:
1442069690324.42 us (23632738287847.00 %)
IRQ latency: 6.10 us
Blocking thread:
:0
------------------------------------------------------------------------
IRQ latency: 6.10 us (100%)
Max timerlat IRQ latency from idle: 6.10 us in cpu 0
Maybe after enough time repeating the command I'm also going to hit
the bug you saw.
Tomas
