linux-kernel - Re: [PATCH v6 1/6] mm/mempolicy: Add MPOL_PREFERRED

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Message-ID: <YQfbXi3foZjOyHm4@dhcp22.suse.cz>
Date:   Mon, 2 Aug 2021 13:47:42 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Feng Tang <feng.tang@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Widawsky, Ben" <ben.widawsky@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andi Kleen <ak@...ux.intel.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v6 1/6] mm/mempolicy: Add MPOL_PREFERRED_MANY for
 multiple preferred nodes

On Mon 02-08-21 19:33:26, Feng Tang wrote:
[...]
> And to be honest, I don't fully understand the current handling for
> 'bind' policy, will the returning NULL for 'bind' policy open a
> sideway for the strict 'bind' limit. 

I do not remember all the details but this is an old behavior that MBIND
policy doesn't apply to kernel allocations in presnce of the movable
zone. Detailed reasoning is not clear to me at the moment, maybe Mel
remembers?
-- 
Michal Hocko
SUSE Labs