From: Michal Hocko <mhocko@kernel.org>
To: Ben Widawsky <ben.widawsky@intel.com>
Cc: linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Lee Schermerhorn <lee.schermerhorn@hp.com>
Subject: Re: [PATCH 02/18] mm/mempolicy: Use node_mem_id() instead of node_id()
Date: Fri, 26 Jun 2020 14:30:54 +0200 [thread overview]
Message-ID: <20200626123054.GY1320@dhcp22.suse.cz> (raw)
In-Reply-To: <20200624164837.pd5q6ox3qgwifpay@intel.com>
On Wed 24-06-20 09:48:37, Ben Widawsky wrote:
> On 20-06-24 10:25:59, Michal Hocko wrote:
> > On Fri 19-06-20 09:24:09, Ben Widawsky wrote:
> > > Calling out some distinctions first as I understand it, and the
> > > reasoning of the patch:
> > > numa_node_id() - The node id for the currently running CPU.
> > > numa_mem_id() - The node id for the closest memory node.
> >
> > Correct
> >
> > > The case where they are not the same is CONFIG_HAVE_MEMORYLESS_NODES.
> > > Only ia64 and powerpc support this option, so it is perhaps not a very
> > > interesting situation to most.
> >
> > Other arches can have nodes without any memory as well. Just offline all
> > the managed memory via hotplug... (please note that such node still
> > might have memory present! Just not useable by the page allocator)
>
> You must have CONFIG_HAVE_MEMORYLESS_NODES defined. So I believe that this
> change is limited to ia64 and powerpc. I don't think there is a way to set it
> outside of those arches.
I have tried to say that while other arches (like x86) do not have
CONFIG_HAVE_MEMORYLESS_NODES defined they still can end up with a memory
node without any memory. Just use memory hotplug...
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-06-26 12:30 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 16:24 [PATCH 00/18] multiple preferred nodes Ben Widawsky
2020-06-19 16:24 ` [PATCH 01/18] mm/mempolicy: Add comment for missing LOCAL Ben Widawsky
2020-06-24 7:55 ` Michal Hocko
2020-06-19 16:24 ` [PATCH 02/18] mm/mempolicy: Use node_mem_id() instead of node_id() Ben Widawsky
2020-06-24 8:25 ` Michal Hocko
2020-06-24 16:48 ` Ben Widawsky
2020-06-26 12:30 ` Michal Hocko [this message]
2020-06-19 16:24 ` [PATCH 03/18] mm/page_alloc: start plumbing multi preferred node Ben Widawsky
2020-06-19 16:24 ` [PATCH 04/18] mm/page_alloc: add preferred pass to page allocation Ben Widawsky
2020-06-19 16:24 ` [PATCH 05/18] mm/mempolicy: convert single preferred_node to full nodemask Ben Widawsky
2020-06-19 16:24 ` [PATCH 06/18] mm/mempolicy: Add MPOL_PREFERRED_MANY for multiple preferred nodes Ben Widawsky
2020-06-19 16:24 ` [PATCH 07/18] mm/mempolicy: allow preferred code to take a nodemask Ben Widawsky
2020-06-19 16:24 ` [PATCH 08/18] mm/mempolicy: refactor rebind code for PREFERRED_MANY Ben Widawsky
2020-06-19 16:24 ` [PATCH 09/18] mm: Finish handling MPOL_PREFERRED_MANY Ben Widawsky
2020-06-19 16:24 ` [PATCH 10/18] mm: clean up alloc_pages_vma (thp) Ben Widawsky
2020-06-19 16:24 ` [PATCH 11/18] mm: Extract THP hugepage allocation Ben Widawsky
2020-06-19 16:24 ` [PATCH 12/18] mm/mempolicy: Use __alloc_page_node for interleaved Ben Widawsky
2020-06-19 16:24 ` [PATCH 13/18] mm: kill __alloc_pages Ben Widawsky
2020-06-19 16:24 ` [PATCH 14/18] mm/mempolicy: Introduce policy_preferred_nodes() Ben Widawsky
2020-06-19 16:24 ` [PATCH 15/18] mm: convert callers of __alloc_pages_nodemask to pmask Ben Widawsky
2020-06-19 16:24 ` [PATCH 16/18] alloc_pages_nodemask: turn preferred nid into a nodemask Ben Widawsky
2020-06-19 16:24 ` [PATCH 17/18] mm: Use less stack for page allocations Ben Widawsky
2020-06-19 16:24 ` [PATCH 18/18] mm/mempolicy: Advertise new MPOL_PREFERRED_MANY Ben Widawsky
2020-06-22 7:09 ` [PATCH 00/18] multiple preferred nodes Michal Hocko
2020-06-23 11:20 ` Michal Hocko
2020-06-23 16:12 ` Ben Widawsky
2020-06-24 7:52 ` Michal Hocko
2020-06-24 16:16 ` Ben Widawsky
2020-06-24 18:39 ` Michal Hocko
2020-06-24 19:37 ` Ben Widawsky
2020-06-24 19:51 ` Michal Hocko
2020-06-24 20:01 ` Ben Widawsky
2020-06-24 20:07 ` Michal Hocko
2020-06-24 20:23 ` Ben Widawsky
2020-06-24 20:42 ` Michal Hocko
2020-06-24 20:55 ` Ben Widawsky
2020-06-25 6:28 ` Michal Hocko
2020-06-26 21:39 ` Ben Widawsky
2020-06-29 10:16 ` Michal Hocko
2020-06-22 20:54 ` Andi Kleen
2020-06-22 21:02 ` Ben Widawsky
2020-06-22 21:07 ` Dave Hansen
2020-06-22 22:02 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2020-06-19 16:23 Ben Widawsky
2020-06-19 16:23 ` [PATCH 02/18] mm/mempolicy: Use node_mem_id() instead of node_id() Ben Widawsky
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