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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Alexander Graf <agraf@suse.com>,
	Liu ping fan <kernelfans@gmail.com>,
	Alexander Graf <agraf@suse.de>
Cc: linuxppc-dev@lists.ozlabs.org, kvm-ppc <kvm-ppc@vger.kernel.org>,
	kvm-devel <kvm@vger.kernel.org>,
	Ben Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH v2] powernv: kvm: make _PAGE_NUMA take effect
Date: Mon, 07 Apr 2014 07:54:29 +0000	[thread overview]
Message-ID: <87bnwdshzu.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <533D47CD.906@suse.com>

Alexander Graf <agraf@suse.com> writes:

> On 03.04.14 04:36, Liu ping fan wrote:
>> Hi Alex, could you help to pick up this patch? since  v3.14 kernel can
>> enable numa fault for powerpc.
>
> What bad happens without this patch? We map a page even though it was 
> declared to get NUMA migrated? What happens next?

Nothing much, we won't be properly accounting the numa access in the
host.  What we want to achieve is to convert a guest access of the page to
a host fault so that we can do proper numa access accounting in the
host. This would enable us to migrate the page to the correct numa
node. 

>
> I'm trying to figure out whether I need to mark this with a stable tag 
> for 3.14.
>
>

-aneesh


WARNING: multiple messages have this Message-ID (diff)
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Alexander Graf <agraf@suse.com>,
	Liu ping fan <kernelfans@gmail.com>,
	Alexander Graf <agraf@suse.de>
Cc: Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org, kvm-devel <kvm@vger.kernel.org>,
	kvm-ppc <kvm-ppc@vger.kernel.org>
Subject: Re: [PATCH v2] powernv: kvm: make _PAGE_NUMA take effect
Date: Mon, 07 Apr 2014 13:12:29 +0530	[thread overview]
Message-ID: <87bnwdshzu.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <533D47CD.906@suse.com>

Alexander Graf <agraf@suse.com> writes:

> On 03.04.14 04:36, Liu ping fan wrote:
>> Hi Alex, could you help to pick up this patch? since  v3.14 kernel can
>> enable numa fault for powerpc.
>
> What bad happens without this patch? We map a page even though it was 
> declared to get NUMA migrated? What happens next?

Nothing much, we won't be properly accounting the numa access in the
host.  What we want to achieve is to convert a guest access of the page to
a host fault so that we can do proper numa access accounting in the
host. This would enable us to migrate the page to the correct numa
node. 

>
> I'm trying to figure out whether I need to mark this with a stable tag 
> for 3.14.
>
>

-aneesh

WARNING: multiple messages have this Message-ID (diff)
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Alexander Graf <agraf@suse.com>,
	Liu ping fan <kernelfans@gmail.com>,
	Alexander Graf <agraf@suse.de>
Cc: linuxppc-dev@lists.ozlabs.org, kvm-ppc <kvm-ppc@vger.kernel.org>,
	kvm-devel <kvm@vger.kernel.org>,
	Ben Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH v2] powernv: kvm: make _PAGE_NUMA take effect
Date: Mon, 07 Apr 2014 13:12:29 +0530	[thread overview]
Message-ID: <87bnwdshzu.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <533D47CD.906@suse.com>

Alexander Graf <agraf@suse.com> writes:

> On 03.04.14 04:36, Liu ping fan wrote:
>> Hi Alex, could you help to pick up this patch? since  v3.14 kernel can
>> enable numa fault for powerpc.
>
> What bad happens without this patch? We map a page even though it was 
> declared to get NUMA migrated? What happens next?

Nothing much, we won't be properly accounting the numa access in the
host.  What we want to achieve is to convert a guest access of the page to
a host fault so that we can do proper numa access accounting in the
host. This would enable us to migrate the page to the correct numa
node. 

>
> I'm trying to figure out whether I need to mark this with a stable tag 
> for 3.14.
>
>

-aneesh

  parent reply	other threads:[~2014-04-07  7:54 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-21  8:15 [PATCH v2] powernv: kvm: make _PAGE_NUMA take effect Liu Ping Fan
2014-01-21  8:15 ` Liu Ping Fan
2014-01-21  8:15 ` Liu Ping Fan
2014-01-21  9:42 ` Aneesh Kumar K.V
2014-01-21  9:54   ` Aneesh Kumar K.V
2014-01-21  9:42   ` Aneesh Kumar K.V
2014-01-27  9:11   ` Alexander Graf
2014-01-27  9:11     ` Alexander Graf
2014-01-27  9:11     ` Alexander Graf
2014-01-27 10:28     ` Aneesh Kumar K.V
2014-01-27 10:40       ` Aneesh Kumar K.V
2014-01-27 10:28       ` Aneesh Kumar K.V
2014-01-27 10:42       ` Alexander Graf
2014-01-27 10:42         ` Alexander Graf
2014-01-27 10:42         ` Alexander Graf
2014-01-27 15:57         ` Aneesh Kumar K.V
2014-01-27 15:57           ` Aneesh Kumar K.V
2014-01-27 15:57           ` Aneesh Kumar K.V
2014-01-27 10:41     ` Paul Mackerras
2014-01-27 10:41       ` Paul Mackerras
2014-01-27 10:41       ` Paul Mackerras
2014-04-03  2:36     ` Liu ping fan
2014-04-03  2:36       ` Liu ping fan
2014-04-03  2:36       ` Liu ping fan
2014-04-03 11:36       ` Alexander Graf
2014-04-03 11:36         ` Alexander Graf
2014-04-03 11:36         ` Alexander Graf
2014-04-03 11:38         ` Alexander Graf
2014-04-03 11:38           ` Alexander Graf
2014-04-03 11:38           ` Alexander Graf
2014-04-03 11:43           ` Alexander Graf
2014-04-03 11:43             ` Alexander Graf
2014-04-03 11:43             ` Alexander Graf
2014-04-07  7:42         ` Aneesh Kumar K.V [this message]
2014-04-07  7:54           ` Aneesh Kumar K.V
2014-04-07  7:42           ` Aneesh Kumar K.V
2014-04-07  8:36           ` Alexander Graf
2014-04-07  8:36             ` Alexander Graf
2014-04-07  8:36             ` Alexander Graf
2014-04-10  3:28             ` Liu ping fan
2014-04-10  3:28               ` Liu ping fan
2014-04-10  3:28               ` Liu ping fan
2014-04-10 10:02               ` Alexander Graf
2014-04-10 10:02                 ` Alexander Graf
2014-04-10 10:02                 ` Alexander Graf

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