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From: Michal Hocko <mhocko@kernel.org>
To: Ben Widawsky <ben.widawsky@intel.com>
Cc: linux-mm <linux-mm@kvack.org>, Andi Kleen <ak@linux.intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Christoph Lameter <cl@linux.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Hildenbrand <david@redhat.com>,
	David Rientjes <rientjes@google.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Kuppuswamy Sathyanarayanan 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Lee Schermerhorn <lee.schermerhorn@hp.com>,
	Li Xinhai <lixinhai.lxh@gmail.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mina Almasry <almasrymina@google.com>, Tejun Heo <tj@kernel.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-api@vger.kernel.org
Subject: Re: [PATCH 00/18] multiple preferred nodes
Date: Wed, 24 Jun 2020 22:07:50 +0200
Message-ID: <20200624200750.GY1320@dhcp22.suse.cz> (raw)
In-Reply-To: <20200624200140.dypw6snshshzlbwa@intel.com>

On Wed 24-06-20 13:01:40, Ben Widawsky wrote:
> On 20-06-24 21:51:58, Michal Hocko wrote:
> > On Wed 24-06-20 12:37:33, Ben Widawsky wrote:
> > > On 20-06-24 20:39:17, Michal Hocko wrote:
> > > > On Wed 24-06-20 09:16:43, Ben Widawsky wrote:
[...]
> > > > > > Or do I miss something that really requires more involved approach like
> > > > > > building custom zonelists and other larger changes to the allocator?
> > > > > 
> > > > > I think I'm missing how this allows selecting from multiple preferred nodes. In
> > > > > this case when you try to get the page from the freelist, you'll get the
> > > > > zonelist of the preferred node, and when you actually scan through on page
> > > > > allocation, you have no way to filter out the non-preferred nodes. I think the
> > > > > plumbing of multiple nodes has to go all the way through
> > > > > __alloc_pages_nodemask(). But it's possible I've missed the point.
> > > > 
> > > > policy_nodemask() will provide the nodemask which will be used as a
> > > > filter on the policy_node.
> > > 
> > > Ah, gotcha. Enabling independent masks seemed useful. Some bad decisions got me
> > > to that point. UAPI cannot get independent masks, and callers of these functions
> > > don't yet use them.
> > > 
> > > So let me ask before I actually type it up and find it's much much simpler, is
> > > there not some perceived benefit to having both masks being independent?
> > 
> > I am not sure I follow. Which two masks do you have in mind? zonelist
> > and user provided nodemask?
> 
> Internally, a nodemask_t for preferred node, and a nodemask_t for bound nodes.

Each mask is a local to its policy object.
-- 
Michal Hocko
SUSE Labs

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200619162425.1052382-1-ben.widawsky@intel.com>
2020-06-22  7:09 ` 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 [this message]
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

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