linux-kernel - Re: [PATCH 0/3] x86: add cpus

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Message-ID: <20080409211411.GA11120@suse.de>
Date:	Wed, 9 Apr 2008 14:14:11 -0700
From:	Greg KH <gregkh@...e.de>
To:	Bert Wesarg <bert.wesarg@...glemail.com>
Cc:	Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>,
	Paul Jackson <pj@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] x86: add cpus_scnprintf function v3

On Wed, Apr 09, 2008 at 10:52:58PM +0200, Bert Wesarg wrote:
> On Wed, Apr 9, 2008 at 10:39 PM, Greg KH <gregkh@...e.de> wrote:
> >
> > On Wed, Apr 09, 2008 at 07:51:23PM +0200, Bert Wesarg wrote:
> >  > On Tue, Apr 8, 2008 at 8:43 PM, Mike Travis <travis@....com> wrote:
> >  > >   * Cleanup usages of cpumask_scprintf in the following files and add
> >  > >     another interface to use cpulist_scnprintf where appropriate.
> >  >
> >  > On Mon, Apr 7, 2008 at 8:22 PM, Mike Travis <travis@....com> wrote:
> >  > >  Part of the change is readability, but also looking towards the future
> >  > >  of 16k/64k/??? # of cpus, the straight mask approach will overflow the
> >  > >  PAGE_SIZE buffer provided (though some pathological cases will overflow
> >  > >  the range method as well.)  So we'll need some advancement in the format
> >  > >  of the printout.
> >  >
> >  > Btw, I think you can now push for a deprecation of the 'old' mask
> >  > attributes, with the justification you have given above. The other
> >  > possibility is to change sysfs to provide bigger attribute buffers
> >  > (CCed Greg for this).
> >
> >  Huh?
> >
> >  sysfs is "one value per file", if you are getting close to PAGE_SIZE in
> >  any sysfs file, then you are doing something very wrong.
> >
> >  What sysfs file currently is trying to output data this big?
> Currently none. But if NR_CPUS >= 16K and PAGE_SIZE == 4K, than any
> file with an cpumask_scnprintf().

Do we have such sysfs files today?

thanks,

greg k-h
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