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: <E87738D94A6AD54789B5B8D1BAEB06CC49F143F02E@azsmsx503.amr.corp.intel.com>
Date:	Mon, 9 Feb 2009 10:00:10 -0700
From:	"Brown, Len" <len.brown@...el.com>
To:	Greg KH <gregkh@...e.de>, Arjan van de Ven <arjan@...radead.org>
CC:	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


>> 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.

cheers,
-Len
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