linux-kernel - Re: [RFC PATCH v6] Documentation/arch: Add Documentation/arch-features.txt

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Date:	Thu, 14 May 2015 09:02:49 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Paul Mackerras <paulus@...ba.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


* Paul Mackerras <paulus@...ba.org> wrote:

> 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".

Yeah, indeed.

I fixed that, PowerPC now looks like this:

      irq time acct:-------------------------------------------.
                THP:------------------------------------.      |
   gcov profile all:-----------------------------.      |      |
    rwsem optimized:----------------------.      |      |      |
   queued spinlocks:---------------.      |      |      |      |
     queued rwlocks:--------.      |      |      |      |      |
     numa balancing:-.      |      |      |      |      |      |
                     |      |      |      |      |      |      |
--------------------------------------------------------------------
  powerpc         |  ok  | TODO | TODO | TODO |  ok  |  ok  |  ok  |

Thanks,

	Ingo
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