Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node

From	Michal Hocko <mhocko@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node
Date	2017-09-27 11:20 +0200
Message-ID	<uugFA-nX-11@gated-at.bofh.it> (permalink)
References	<uufTc-8kl-13@gated-at.bofh.it> <uufTc-8kl-21@gated-at.bofh.it> <uugcx-8qD-1@gated-at.bofh.it> <uugvT-kx-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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

Thread

[PATCH 0/6] Add kmalloc_array_node() and kcalloc_node() Johannes Thumshirn <jthumshirn@suse.de> - 2017-09-27 10:30 +0200
  [PATCH 4/6] IB/rdmavt: use kmalloc_array_node Johannes Thumshirn <jthumshirn@suse.de> - 2017-09-27 10:30 +0200
    Re: [PATCH 4/6] IB/rdmavt: use kmalloc_array_node Christopher Lameter <cl@linux.com> - 2017-09-27 11:10 +0200
  [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Johannes Thumshirn <jthumshirn@suse.de> - 2017-09-27 10:30 +0200
    Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Michal Hocko <mhocko@kernel.org> - 2017-09-27 10:50 +0200
      Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Christopher Lameter <cl@linux.com> - 2017-09-27 11:10 +0200
        Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Michal Hocko <mhocko@kernel.org> - 2017-09-27 11:20 +0200
    Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Christopher Lameter <cl@linux.com> - 2017-09-27 11:00 +0200
    Re: [PATCH 1/6] mm: add kmalloc_array_node and kcalloc_node Vlastimil Babka <vbabka@suse.cz> - 2017-09-29 14:10 +0200
  [PATCH 2/6] block: use kmalloc_array_node Johannes Thumshirn <jthumshirn@suse.de> - 2017-09-27 10:30 +0200
    Re: [PATCH 2/6] block: use kmalloc_array_node Christopher Lameter <cl@linux.com> - 2017-09-27 11:00 +0200
  [PATCH 3/6] IB/qib: use kmalloc_array_node Johannes Thumshirn <jthumshirn@suse.de> - 2017-09-27 10:30 +0200
    Re: [PATCH 3/6] IB/qib: use kmalloc_array_node Christopher Lameter <cl@linux.com> - 2017-09-27 11:00 +0200
  [PATCH 5/6] mm, mempool: use kmalloc_array_node Johannes Thumshirn <jthumshirn@suse.de> - 2017-09-27 10:30 +0200
    Re: [PATCH 5/6] mm, mempool: use kmalloc_array_node Christopher Lameter <cl@linux.com> - 2017-09-27 11:10 +0200

csiph-web