From: Andi Kleen <ak@linux.intel.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>, Christoph Lameter <cl@linux.com>,
lee.schermerhorn@hp.com, David Rientjes <rientjes@google.com>
Subject: Re: [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance
Date: Tue, 13 Dec 2011 11:06:32 -0800 [thread overview]
Message-ID: <20111213190632.GA5830@tassilo.jf.intel.com> (raw)
In-Reply-To: <1323655125.22361.376.camel@sli10-conroe>
On Mon, Dec 12, 2011 at 09:58:45AM +0800, Shaohua Li wrote:
> If mem plicy is interleaves, we will allocated pages from nodes in a round
> robin way. This surely can do interleave fairly, but not optimal.
>
> Say the pages will be used for I/O later. Interleave allocation for two pages
> are allocated from two nodes, so the pages are not physically continuous. Later
I would prefer to add a new policy (INTERLEAVE_MULTI or so) for this
instead of a global sysctl, that takes the additional parameter.
Also I don't like having more per task state. Could you compute this
from the address instead even for the process policy case?
-Andi
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WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@linux.intel.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>, Christoph Lameter <cl@linux.com>,
lee.schermerhorn@hp.com, David Rientjes <rientjes@google.com>
Subject: Re: [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance
Date: Tue, 13 Dec 2011 11:06:32 -0800 [thread overview]
Message-ID: <20111213190632.GA5830@tassilo.jf.intel.com> (raw)
In-Reply-To: <1323655125.22361.376.camel@sli10-conroe>
On Mon, Dec 12, 2011 at 09:58:45AM +0800, Shaohua Li wrote:
> If mem plicy is interleaves, we will allocated pages from nodes in a round
> robin way. This surely can do interleave fairly, but not optimal.
>
> Say the pages will be used for I/O later. Interleave allocation for two pages
> are allocated from two nodes, so the pages are not physically continuous. Later
I would prefer to add a new policy (INTERLEAVE_MULTI or so) for this
instead of a global sysctl, that takes the additional parameter.
Also I don't like having more per task state. Could you compute this
from the address instead even for the process policy case?
-Andi
next prev parent reply other threads:[~2011-12-13 19:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 1:58 [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance Shaohua Li
2011-12-12 1:58 ` Shaohua Li
2011-12-13 19:06 ` Andi Kleen [this message]
2011-12-13 19:06 ` Andi Kleen
2011-12-13 20:12 ` Christoph Lameter
2011-12-13 20:12 ` Christoph Lameter
2011-12-13 20:38 ` Andi Kleen
2011-12-13 20:38 ` Andi Kleen
2011-12-14 2:33 ` Shaohua Li
2011-12-14 2:33 ` Shaohua Li
2011-12-14 17:53 ` Andi Kleen
2011-12-14 17:53 ` Andi Kleen
2011-12-15 1:27 ` Shaohua Li
2011-12-15 1:27 ` Shaohua Li
2012-01-09 7:31 ` Shaohua Li
2012-01-09 7:31 ` Shaohua Li
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