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Date: Fri, 8 Aug 2014 14:44:12 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Jiri Kosina <jkosina@...e.cz>
Cc: linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Michal Hocko <mhocko@...e.cz>, Jan Kara <jack@...e.cz>,
Frederic Weisbecker <fweisbec@...il.com>,
Dave Anderson <anderson@...hat.com>,
Petr Mladek <pmladek@...e.cz>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Konstantin Khlebnikov <koct9i@...il.com>
Subject: Re: [RFC][PATCH 0/5 v2] x86/nmi: Print all cpu stacks from NMI
safely
On Thu, 7 Aug 2014 10:41:45 +0200 (CEST)
Jiri Kosina <jkosina@...e.cz> wrote:
> On Thu, 26 Jun 2014, Steven Rostedt wrote:
>
> > This is version 2:
> >
> > This is my proposal to print the NMI stack traces from an RCU stall safely.
> > Here's the gist of it.
>
> Steven, what's your plan with this patchset please?
Has there been consensus on this approach?
>
> It has been tested by Petr here on the systems under the loads that are
> able to trigger the hangs.
>
> It'd be nice to have this in 3.17, so that we can then start working on
> fixing all the remaining printk() calls in NMI context once this biggest
> offender (stack dumping) is done.
It definitely wont be in 3.17 (too late). I'm fine with getting this
ready unless there's other objections.
3.17 does contain the updates to trace_seq that Andrew made. Linus had
issues with the "trace" name, which this patch set creates a new
"seq_buf" that is a subset of the trace_seq.
I'll keep this on my todo list for 3.18 and push out patches to get
people's comments about it after 3.17 merge window has closed (the
required people are a bit busy at the moment).
-- Steve
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