linux-kernel - Re: [PATCH V2 -tip 3/4] Tracing/ftrace: Adapt mmiotrace to the new type of print

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Date:	Tue, 30 Sep 2008 14:39:06 +0200
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Pekka Paalanen" <pq@....fi>, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org
Subject: Re: [PATCH V2 -tip 3/4] Tracing/ftrace: Adapt mmiotrace to the new type of print_line

2008/9/30 Ingo Molnar <mingo@...e.hu>:
> thanks guys!
>
> Steve's latest trace-ringbuffer code against -tip complicates life a
> little bit.
>
> We dont yet know whether tip/tracing/ring-buffer is ready for wider
> consumption, so it's in a separate feature branch. These four patches
> conflict with the ring-buffer code quite widely.
>
> So ... i did an optimistic merge approach: i merged these 4 patches
> ontop of the new tip/tracing/ring-buffer code, and have put it into a
> new tip/tracing/pipe branch:
>
>  # f19d495: tracing/ftrace: adapt the boot tracer to the new print_line type
>  # 92261f6: tracing/ftrace: adapt mmiotrace to the new type of print_line
>  # 157190e: tracing/ftrace: fix pipe breaking
>  # 92e359a: tracing/ftrace: change the type of the print_line callback
>
> i'm merging this into tip/master for a bit of testing, but if it breaks
> something (or if i havent pushed it out yet) you can merge it locally
> too, by doing this ontop of tip/master:
>
>  git-merge tip/tracing/pipe
>
> it should merge up cleanly and you should be able to check the end
> result. (and send me any fixes for merge mistakes)
>
> ( Once it's all in reasonably well-tested shape it will all show up in
>  tip/master and you can stop dealing with tip/tracing/* sub-branches.)
>
>        Ingo
>

Thanks Ingo.

I'm currently testing tip/master, since tracing/pipe is merged into.
It seems there are some locking issues that I hadn't when I tested the patches.
Perhaps it's because of the merge with the new ring buffer.

I just launched the sched_switch tracer and it worked well until 4
seconds of execution. And after that it blocked.
I tested too a marker message adding and it is never displayed. Worse:
I can't break the pipe with Ctrl + C after that.

When I will have some time, I will try to debug all what I find.
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