linux-kernel - RE: [PATCH 1/1] Drivers: hv: Introduce a policy for controlling channel affinity

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Date:   Wed, 31 Aug 2016 17:56:42 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "leann.ogasawara@...onical.com" <leann.ogasawara@...onical.com>,
        "K. Y. Srinivasan" <kys@...hange.microsoft.com>
Subject: RE: [PATCH 1/1] Drivers: hv: Introduce a policy for controlling
 channel affinity



> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Wednesday, August 31, 2016 4:14 PM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> jasowang@...hat.com; leann.ogasawara@...onical.com; K. Y. Srinivasan
> <kys@...hange.microsoft.com>
> Subject: Re: [PATCH 1/1] Drivers: hv: Introduce a policy for controlling channel
> affinity
> 
> On Wed, Jul 06, 2016 at 06:02:15PM -0700, kys@...hange.microsoft.com
> wrote:
> > From: K. Y. Srinivasan <kys@...hange.microsoft.com>
> >
> > Introduce a mechanism to control how channels will be affinitized. We will
> > support two policies:
> >
> > 1. HV_BALANCED: All performance critical channels will be dstributed
> > evenly amongst all the available NUMA nodes. Once the Node is assigned,
> > we will assign the CPU based on a simple round robin scheme.
> >
> > 2. HV_LOCALIZED: Only the primary channels are distributed across all
> > NUMA nodes. Sub-channels will be in the same NUMA node as the primary
> > channel. This is the current behaviour.
> >
> > The default policy will be the HV_BALANCED as it can minimize the remote
> > memory access on NUMA machines with applications that span NUMA nodes.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...hange.microsoft.com>
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > ---
> >  drivers/hv/channel_mgmt.c |   68 +++++++++++++++++++++++++---------------
> ----
> >  include/linux/hyperv.h    |   23 +++++++++++++++
> >  2 files changed, 62 insertions(+), 29 deletions(-)
> 
> Also doesn't apply cleanly :(
> 

I will fix this and resend.

K. Y