linux-kernel - Re: [PATCH v11 5/5] ring-buffer/selftest: Add ring-buffer mapping test

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Date: Sun, 14 Jan 2024 11:20:14 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Vincent Donnefort <vdonnefort@...gle.com>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
 kernel-team@...roid.com, Shuah Khan <shuah@...nel.org>, Shuah Khan
 <skhan@...uxfoundation.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v11 5/5] ring-buffer/selftest: Add ring-buffer mapping
 test

On Sun, 14 Jan 2024 23:17:11 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:
> > 
> > Looks good to me and tested.
> > 
> > Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > Tested-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>  
> 
> Sorry, I should cancel these. I found this test did not pass if I set
> the function tracer on.
> 
> / # cd /sys/kernel/tracing/
> /sys/kernel/tracing # echo function > current_tracer 
> /sys/kernel/tracing # /mnt/map_test 
> TAP version 13
> 1..2
> # Starting 2 tests from 2 test cases.
> #  RUN           map.subbuf_size_4k.meta_page_check ...
> # map_test.c:174:meta_page_check:Expected self->meta->entries (15293) == 16 (16)
> # meta_page_check: Test terminated by assertion
> #          FAIL  map.subbuf_size_4k.meta_page_check
> not ok 1 map.subbuf_size_4k.meta_page_check
> #  RUN           map.subbuf_size_8k.meta_page_check ...
> # map_test.c:174:meta_page_check:Expected self->meta->entries (15270) == 16 (16)
> # meta_page_check: Test terminated by assertion
> #          FAIL  map.subbuf_size_8k.meta_page_check
> not ok 2 map.subbuf_size_8k.meta_page_check
> # FAILED: 0 / 2 tests passed.
> # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:0 error:0
> 
> Does this depend on "nop" tracer?

Yes.

> > > +
> > > +static int tracefs_reset(void)
> > > +{
> > > +	if (__tracefs_write_int(TRACEFS_ROOT"/tracing_on", 0))
> > > +		return -1;
> > > +	if (__tracefs_write_int(TRACEFS_ROOT"/trace", 0))
> > > +		return -1;
> > > +	if (__tracefs_write(TRACEFS_ROOT"/set_event", ""))
> > > +		return -1;

Looks like the below is needed:

	if (__traces_write(TRACEFS_ROOT"/current_tracer", "nop"))
		return -1;

> > > +
> > > +	return 0;
> > > +}
> > > +

-- Steve