linux-kernel - Re: patch acpi-remove-locking-from-pm1x_sts-register-reads.patch added to 2.6.28-stable tree

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Message-ID: <20090209171254.GA24704@suse.de>
Date:	Mon, 9 Feb 2009 09:12:54 -0800
From:	Greg KH <gregkh@...e.de>
To:	"Brown, Len" <len.brown@...el.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Stefan Lippers-Hollmann <s.L-H@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: patch acpi-remove-locking-from-pm1x_sts-register-reads.patch
	added to 2.6.28-stable tree

On Mon, Feb 09, 2009 at 10:00:10AM -0700, Brown, Len wrote:
> 
> >> why is this -stable material?
> >> this is a performance improvement....
> >
> >It is, and not a bugfix?  If so, I'll drop it.
> 
> yes, removing the un-necessary locking
> it is a scaling performance improvement.
> 
> The code has been this way for years.
> The reason we noticed this issue recently
> is because of the emergence of systems that
> simultaneously have many threads and also
> have deep C-states.
> 
> In 2.6.30 we plan larger improvements in this area.

Ok, I'll go drop this patch from the -stable trees.

thanks,

greg k-h
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