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From: Michal Hocko <mhocko@suse.com>
To: Feng Tang <feng.tang@intel.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Ben Widawsky <ben.widawsky@intel.com>,
	linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	Andrea Arcangeli <aarcange@redhat.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Andi Kleen <ak@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	ying.huang@intel.com, Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [PATCH v6 1/6] mm/mempolicy: Add MPOL_PREFERRED_MANY for multiple preferred nodes
Date: Fri, 30 Jul 2021 08:36:50 +0200	[thread overview]
Message-ID: <YQOeAgPS9+FUseIx@dhcp22.suse.cz> (raw)
In-Reply-To: <20210730030502.GA87066@shbuild999.sh.intel.com>

On Fri 30-07-21 11:05:02, Feng Tang wrote:
> On Thu, Jul 29, 2021 at 06:21:19PM +0200, Michal Hocko wrote:
> > On Thu 29-07-21 23:12:42, Feng Tang wrote:
> > > On Thu, Jul 29, 2021 at 03:38:44PM +0200, Michal Hocko wrote:
> > [...]
> > > > Also the
> > > > semantic to give nodes some ordering based on their numbers sounds
> > > > rather weird to me.
> > > 
> > > I agree, and as I admitted in the first reply, this need to be fixed.
> > 
> > OK. I was not really clear that we are on the same page here.
> > 
> > > > The semantic I am proposing is to allocate from prefered nodes in
> > > > distance order starting from the local node.
> > > 
> > > So the plan is:
> > > * if the local node is set in 'prefer-many's nodemask, then chose
> > > * otherwise chose the node with the shortest distance to local node
> > > ?
> > 
> > Yes and what I am trying to say is that you will achieve that simply by
> > doing the following in policy_node:
> > 	if (policy->mode == MPOL_PREFERRED_MANY)
> > 		return nd;
> 
> One thing is, it's possible that 'nd' is not set in the preferred
> nodemask. 

Yes, and there shouldn't be any problem with that.  The given node is
only used to get the respective zonelist (order distance ordered list of
zones to try). get_page_from_freelist will then use the preferred node
mask to filter this zone list. Is that more clear now?
-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2021-07-30  6:36 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12  8:09 [PATCH v6 0/6] Introduce multi-preference mempolicy Feng Tang
2021-07-12  8:09 ` [PATCH v6 1/6] mm/mempolicy: Add MPOL_PREFERRED_MANY for multiple preferred nodes Feng Tang
2021-07-28 12:31   ` Michal Hocko
2021-07-28 14:11     ` Feng Tang
2021-07-28 16:12       ` Michal Hocko
2021-07-29  7:09         ` Feng Tang
2021-07-29 13:38           ` Michal Hocko
2021-07-29 15:12             ` Feng Tang
2021-07-29 16:21               ` Michal Hocko
2021-07-30  3:05                 ` Feng Tang
2021-07-30  6:36                   ` Michal Hocko [this message]
2021-07-30  7:18                     ` Feng Tang
2021-07-30  7:38                       ` Michal Hocko
2021-08-02  8:11                       ` Feng Tang
2021-08-02 11:14                         ` Michal Hocko
2021-08-02 11:33                           ` Feng Tang
2021-08-02 11:47                             ` Michal Hocko
2021-07-12  8:09 ` [PATCH v6 2/6] mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy Feng Tang
2021-07-28 12:42   ` Michal Hocko
2021-07-28 15:18     ` Feng Tang
2021-07-28 15:25       ` Feng Tang
2021-07-28 16:15         ` Michal Hocko
2021-07-28 16:14       ` Michal Hocko
2021-07-12  8:09 ` [PATCH v6 3/6] mm/mempolicy: enable page allocation for MPOL_PREFERRED_MANY for general cases Feng Tang
2021-07-12  8:09 ` [PATCH v6 4/6] mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY Feng Tang
2021-07-21 20:49   ` Mike Kravetz
2021-07-22  8:11     ` Feng Tang
2021-07-22  9:42     ` Michal Hocko
2021-07-22 16:21       ` Mike Kravetz
2021-07-12  8:09 ` [PATCH v6 5/6] mm/mempolicy: Advertise new MPOL_PREFERRED_MANY Feng Tang
2021-07-28 12:47   ` Michal Hocko
2021-07-28 13:41     ` Feng Tang
2021-07-12  8:09 ` [PATCH v6 6/6] mm/mempolicy: unify the create() func for bind/interleave/prefer-many policies Feng Tang
2021-07-28 12:51   ` Michal Hocko
2021-07-28 13:50     ` Feng Tang
2021-07-15  0:15 ` [PATCH v6 0/6] Introduce multi-preference mempolicy Andrew Morton
2021-07-15  2:13   ` Feng Tang
2021-07-15 18:49   ` Dave Hansen

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