linux-kernel - Re: [PATCH 1/2] tracing: don't busy wait in buffer splice

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Message-ID: <20141107190413.28a2ae84@gandalf.local.home>
Date:	Fri, 7 Nov 2014 19:04:13 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rabin Vincent <rabin@....in>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tracing: don't busy wait in buffer splice

On Fri, 7 Nov 2014 13:21:06 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:


> This also needs to be marked for stable. I'll start looking at how far
> this goes back. I'm thinking it may go back as far as the splice code
> was created.

Actually, it is broken back to 3.16. 3.15 and before was safe because
it was still using the mockup poll_wait_pipe() that would wake up every
1/10 of a second to see if something was in the buffer.

See commit: b1169cc69ba9 "tracing: Remove mock up poll wait function"

-- Steve
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