linux-kernel - Re: [PATCH v4 2/2] arm64: Expand the stack trace feature to support IRQ stack

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Message-Id: <179A25A2-C346-46C0-93D1-BABD4B6CB401@gmail.com>
Date:	Thu, 15 Oct 2015 23:24:57 +0900
From:	Jungseok Lee <jungseoklee85@...il.com>
To:	James Morse <james.morse@....com>
Cc:	takahiro.akashi@...aro.org, catalin.marinas@....com,
	will.deacon@....com, linux-arm-kernel@...ts.infradead.org,
	mark.rutland@....com, barami97@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] arm64: Expand the stack trace feature to support IRQ stack

On Oct 9, 2015, at 11:24 PM, James Morse wrote:

Hi James,

[ ... ]

> I think unwind_frame() needs to walk the irq stack too. [2] is an example
> of perf tracing back to userspace, (and there are patches on the list to
> do/fix this), so we need to walk back to the start of the first stack for
> the perf accounting to be correct.

I plan to do re-spin this series without [PATCH 2/2] since 1) Akashi's
approach looks better than mine and 2) you have the perf patches for [2].
This would help us to move forward.

Thoughts?

[ ... ]

> [0] sudo ./perf record -e mem:<address of __do_softirq()>:x -ag -- sleep 10
> [1] sudo ./perf report --call-graph --stdio
> [2] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html

Best Regards
Jungseok Lee
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