linux-kernel - Re: [GIT PULL] perf changes

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Date:	Tue, 25 May 2010 10:22:21 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf changes

On Mon, May 24, 2010 at 09:25:31PM +0200, Ingo Molnar wrote:

> Please pull the latest perf-core-for-linus git tree from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git perf-core-for-linus
> 
> Most of these changes are fixes and dead code removal, but 
> also a set of optimizations and a series of tracing 
> size-optimization bits that we kept pending because they 
> conflicted with the previous push - and some TUI 
> enhancements.

...

> Peter Zijlstra (16):
>       perf/ftrace: Optimize perf/tracepoint interaction for single events
>       perf: Optimize buffer placement by allocating buffers NUMA aware
>       perf: Disallow mmap() on per-task inherited events
>       perf: Optimize the perf_output() path by removing IRQ-disables
>       perf: Optimize the hotpath by converting the perf output buffer to local_t
>       perf: Optimize perf_output_*() by avoiding local_xchg()
>       perf, trace: Optimize tracepoints by removing IRQ-disable from perf/tracepoint interaction

This commit breaks all non-x86 architectures by adding a reference to
regs->flags in generic code.  I mentioned this on lkml (with cc to
Ingo and Peter), and Peter has a further patch that fixes the problem,
which isn't in this pull.

So Linus, please don't do this pull just yet, until we get this extra
patch merged.

Paul.
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