linux-kernel - Re: Backport request to stable of two performance related fixes for xen-blkfront (3.13 fixes to earlier trees)

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Message-ID: <537DF36F.5070909@citrix.com>
Date:	Thu, 22 May 2014 14:54:07 +0200
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Greg KH <gregkh@...uxfoundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>, <felipe.franciosi@...rix.com>,
	<jerry.snitselaar@...cle.com>, <axboe@...nel.dk>
Subject: Re: Backport request to stable of two performance related fixes for
 xen-blkfront (3.13 fixes to earlier trees)

On 20/05/14 05:19, Greg KH wrote:
> On Wed, May 14, 2014 at 03:11:22PM -0400, Konrad Rzeszutek Wilk wrote:
>> Hey Greg
>>
>> This email is in regards to backporting two patches to stable that
>> fall under the 'performance' rule:
>>
>>  bfe11d6de1c416cea4f3f0f35f864162063ce3fa
>>  fbe363c476afe8ec992d3baf682670a4bd1b6ce6
>>
>> I've copied Jerry - the maintainer of the Oracle's kernel. I don't have
>> the emails of the other distros maintainers but the bugs associated with it are:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=1096909
>> (RHEL7)
>> https://bugs.launchpad.net/ubuntu/+bug/1319003
>> (Ubuntu 13.10)
>>
>> The following distros are affected:
>>
>> (x) Ubuntu 13.04 and derivatives (3.8)
>> (v) Ubuntu 13.10 and derivatives (3.11), supported until 2014-07
>> (x) Fedora 17 (3.8 and 3.9 in updates)
>> (x) Fedora 18 (3.8, 3.9, 3.10, 3.11 in updates)
>> (v) Fedora 19 (3.9; 3.10, 3.11, 3.12 in updates; fixed with latest update to 3.13), supported until TBA
>> (v) Fedora 20 (3.11; 3.12 in updates; fixed with latest update to 3.13), supported until TBA
>> (v) RHEL 7 and derivatives (3.10), expected to be supported until about 2025
>> (v) openSUSE 13.1 (3.11), expected to be supported until at least 2016-08
>> (v) SLES 12 (3.12), expected to be supported until about 2024
>> (v) Mageia 3 (3.8), supported until 2014-11-19
>> (v) Mageia 4 (3.12), supported until 2015-08-01
>> (v) Oracle Enterprise Linux with Unbreakable Enterprise Kernel Release 3 (3.8), supported until TBA
>>
>> Here is the analysis of the problem and what was put in the RHEL7 bug.
>> The Oracle bug does not exist (as I just backport them in the kernel and
>> send a GIT PULL to Jerry) - but if you would like I can certainly furnish
>> you with one (it would be identical to what is mentioned below).
>>
>> If you are OK with the backport, I am volunteering Roger and Felipe to assist
>> in jamming^H^H^H^Hbackporting the patches into earlier kernels.
> 
> Sure, can you provide backported patches?  As-is, they don't apply to
> the 3.10-stable kernel.

Here are the backported patches to 3.10 stable, I would like however to
get some testing/benchmarking on them before applying, since it's not a
trivial backport. Could you please give them a spin Felipe?

Roger.


View attachment "0001-backport-of-fbe363-to-stable-3.10.y-branch.patch" of type "text/plain" (2702 bytes)

View attachment "0002-backport-of-bfe11d-to-stable-3.10.y-branch.patch" of type "text/plain" (9846 bytes)