linux-kernel - Re: [RFC PATCH 2/2] mempolicy: kill MPOL_F

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Message-ID: <8e1cf4dd-1bb2-fbcb-4960-65db8704ec38@linux.intel.com>
Date:   Thu, 13 May 2021 06:55:38 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Feng Tang <feng.tang@...el.com>, Michal Hocko <mhocko@...e.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Widawsky, Ben" <ben.widawsky@...el.com>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Williams, Dan J" <dan.j.williams@...el.com>, ying.huang@...el.com
Subject: Re: [RFC PATCH 2/2] mempolicy: kill MPOL_F_LOCAL bit


On 5/13/2021 12:25 AM, Feng Tang wrote:
> mempolicy: kill MPOL_F_LOCAL bit
>
> Now the only remaining case of actual 'local' policy faked by
> 'prefer' policy plus MPOL_F_LOCAL bit is:
>
> A valid 'prefer' policy with a valid 'preferred' node is 'rebind'
> to a nodemask which doesn't contains the 'preferred' node, then it
> will handle allocation with 'local' policy.
>
> Add a new 'MPOL_F_LOCAL_TEMP' bit for this case, and kill the
> MPOL_F_LOCAL bit, which could simplify the code much.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>


-Andi