All of lore.kernel.org
 help / color / mirror / Atom feed
From: Michal Hocko <mhocko@kernel.org>
To: Christopher Lameter <cl@linux.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node
Date: Wed, 27 Sep 2017 11:16:19 +0200	[thread overview]
Message-ID: <20170927091619.lkhfhwv3uu3km3sv@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.20.1709270358400.30866@nuc-kabylake>

On Wed 27-09-17 04:03:01, Cristopher Lameter wrote:
> On Wed, 27 Sep 2017, Michal Hocko wrote:
> 
> > > Introduce a combination of the two above cases to have a NUMA-node aware
> > > version of kmalloc_array() and kcalloc().
> >
> > Yes, this is helpful. I am just wondering why we cannot have
> > kmalloc_array to call kmalloc_array_node with the local node as a
> > parameter. Maybe some sort of an optimization?
> 
> Well the regular kmalloc without node is supposed to follow memory
> policies. An explicit mentioning of a node requires allocation from that
> node and will override memory allocation policies.

I see. Thanks for the clarification

-- 
Michal Hocko
SUSE Labs

WARNING: multiple messages have this Message-ID
From: Michal Hocko <mhocko@kernel.org>
To: Christopher Lameter <cl@linux.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node
Date: Wed, 27 Sep 2017 11:16:19 +0200	[thread overview]
Message-ID: <20170927091619.lkhfhwv3uu3km3sv@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.20.1709270358400.30866@nuc-kabylake>

On Wed 27-09-17 04:03:01, Cristopher Lameter wrote:
> On Wed, 27 Sep 2017, Michal Hocko wrote:
> 
> > > Introduce a combination of the two above cases to have a NUMA-node aware
> > > version of kmalloc_array() and kcalloc().
> >
> > Yes, this is helpful. I am just wondering why we cannot have
> > kmalloc_array to call kmalloc_array_node with the local node as a
> > parameter. Maybe some sort of an optimization?
> 
> Well the regular kmalloc without node is supposed to follow memory
> policies. An explicit mentioning of a node requires allocation from that
> node and will override memory allocation policies.

I see. Thanks for the clarification

-- 
Michal Hocko
SUSE Labs

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  reply	other threads:[~2017-09-27  9:16 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-27  8:20 [PATCH 0/6] Add kmalloc_array_node() and kcalloc_node() Johannes Thumshirn
2017-09-27  8:20 ` Johannes Thumshirn
2017-09-27  8:20 ` [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Johannes Thumshirn
2017-09-27  8:20   ` Johannes Thumshirn
2017-09-27  8:42   ` Michal Hocko
2017-09-27  8:42     ` Michal Hocko
2017-09-27  9:03     ` Christopher Lameter
2017-09-27  9:16       ` Michal Hocko [this message]
2017-09-27  9:16         ` Michal Hocko
2017-09-27  8:56   ` Christopher Lameter
2017-09-29 12:00   ` Vlastimil Babka
2017-09-29 12:00     ` Vlastimil Babka
2017-09-27  8:20 ` [PATCH 2/6] block: use kmalloc_array_node Johannes Thumshirn
2017-09-27  8:20   ` Johannes Thumshirn
2017-09-27  8:57   ` Christopher Lameter
2017-09-27  8:20 ` [PATCH 3/6] IB/qib: " Johannes Thumshirn
2017-09-27  8:20   ` Johannes Thumshirn
2017-09-27  8:58   ` Christopher Lameter
2017-09-27  8:20 ` [PATCH 4/6] IB/rdmavt: " Johannes Thumshirn
2017-09-27  8:20   ` Johannes Thumshirn
2017-09-27  9:04   ` Christopher Lameter
2017-09-27  8:20 ` [PATCH 5/6] mm, mempool: " Johannes Thumshirn
2017-09-27  8:20   ` Johannes Thumshirn
2017-09-27  9:04   ` Christopher Lameter
2017-09-27  8:20 ` [PATCH 6/6] rds: ib: " Johannes Thumshirn
2017-09-27  8:20   ` Johannes Thumshirn
2017-09-27  9:03   ` Christopher Lameter

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170927091619.lkhfhwv3uu3km3sv@dhcp22.suse.cz \
    --to=mhocko@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=cl@linux.com \
    --cc=damien.lemoal@wdc.com \
    --cc=hch@lst.de \
    --cc=iamjoonsoo.kim@lge.com \
    --cc=jthumshirn@suse.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=penberg@kernel.org \
    --cc=rientjes@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.