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Message-ID: <20150514035517.GA27285@drongo.ozlabs.ibm.com>
Date: Thu, 14 May 2015 13:55:17 +1000
From: Paul Mackerras <paulus@...ba.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
Peter Zijlstra <peterz@...radead.org>,
Josh Triplett <josh@...htriplett.org>,
Andy Lutomirski <luto@...capital.net>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
x86@...nel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC PATCH v6] Documentation/arch: Add
Documentation/arch-features.txt
On Wed, May 13, 2015 at 03:48:42PM +0200, Ingo Molnar wrote:
>
> Updated patch attached - I've added a few more features to the last
> table, and restructured the explanations, now every feature
> description also lists the Kconfig variable that it's tracking, e.g.:
>
> irq time acct: HAVE_IRQ_TIME_ACCOUNTING
Regarding that one specifically, as far as I can see,
HAVE_IRQ_TIME_ACCOUNTING is only relevant for tick-based time
accounting. If you have CONFIG_VIRT_CPU_ACCOUNTING you get accurate
irq time accounting with or without HAVE_IRQ_TIME_ACCOUNTING. So how
about making this one:
irq time acct: HAVE_IRQ_TIME_ACCOUNTING || VIRT_CPU_ACCOUNTING
That would make the "irq time acct" entry for powerpc be "ok".
Paul.
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