linux-kernel - Re: [PATCH v2 0/5] perf test trace: Reduce test failures and make error messages verbose

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Message-ID: <CAH0uvogRdA15hhyq=9SmJiHWwoARBEBdAh3PA9pOXVbBBo5ODg@mail.gmail.com>
Date: Mon, 19 May 2025 12:27:48 -0700
From: Howard Chu <howardchu95@...il.com>
To: Ian Rogers <irogers@...gle.com>
Cc: acme@...nel.org, mingo@...hat.com, namhyung@...nel.org, 
	mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org, 
	adrian.hunter@...el.com, peterz@...radead.org, kan.liang@...ux.intel.com, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/5] perf test trace: Reduce test failures and make
 error messages verbose

Hello Ian,

On Mon, May 19, 2025 at 10:00 AM Ian Rogers <irogers@...gle.com> wrote:
>

<SNIP>

> ```
> --- start ---
> test child forked, pid 279547
> Checking if vmlinux BTF exists
> Testing perf trace's string augmentation
> Testing perf trace's buffer augmentation
> Testing perf trace's struct augmentation
> BTF struct augmentation test failed, output:
> sleep/279619 clock_nanosleep(0, 0, {1,1,}, 0x7ffcd47b6450) = 0

Thank you so much for testing it :)

My bad, I have just realized this is because of the data in the
timespec, nothing to do with libbpf... The tv_nsec has a value of 1. I
think the 'sleep' on your machine has a different implementation. On
my machine, the second member has a value of 0, see below:
~~~
$ sudo /tmp/perf/perf trace -e clock_nanosleep -- sleep 1
     0.000 (1000.196 ms): sleep/54261 clock_nanosleep(rqtp: { .tv_sec:
1, .tv_nsec: 0 }, rmtp: 0x7ffe13529550) = 0

$ strace -e clock_nanosleep -- sleep 1
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=1, tv_nsec=0}, 0x7fff859365a0) = 0
+++ exited with 0 +++
~~~

Can you please run any of the commands above and see what
happens(please change the perf executable path)? If you get 'rqtp: {
.tv_sec: 1, .tv_nsec: 1 }' then I will just make the regex less
strict, because it differs between different 'sleep' implementations
instead of having anything to do with perf itself.

Thanks,
Howard