linux-kernel - [RFC GIT PULL] x86 entry / perf stacktrace changes

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Message-Id: <1309624184-9790-1-git-send-email-fweisbec@gmail.com>
Date:	Sat,  2 Jul 2011 18:29:38 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jan Beulich <JBeulich@...ell.com>
Subject: [RFC GIT PULL] x86 entry / perf stacktrace changes

Ingo,

Please pull the perf/stacktrace branch that can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
	perf/stacktrace

Or may be not yet. It's still in RFC because I would like
to ensure I did not break cfi annotations. I hope Jan beulich
or others can have a look.

Sorry to mess up irq entry and perf stacktrace changes in the same
topic. But the changes happen to be very interconnected.

Several cleanups, fixes and optimizations for the x86-64
stacktraces and irq entry.

Last patch seems to add a bit of overhead in the irq entry
(one more "push") but given the changes made in previous
patches, the end result is a more optimized and more clear irq
entry.

Thanks,
	Frederic
---

Frederic Weisbecker (6):
      x86: Save stack pointer in perf live regs savings
      x86: Fetch stack from regs when possible in dump_trace()
      x86,64: Simplify save_regs()
      x86,64: Separate arg1 from rbp handling in SAVE_REGS_IRQ
      x86: Remove useless unwinder backlink from irq regs saving
      x86: Don't use frame pointer to save old stack on irq entry


 arch/x86/include/asm/perf_event.h |    5 +++
 arch/x86/kernel/dumpstack_64.c    |   37 +++-----------------
 arch/x86/kernel/entry_64.S        |   69 ++++++++++++++++--------------------
 3 files changed, 41 insertions(+), 70 deletions(-)
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