linux-kernel - Re: [PATCH 01/12] hugetlbfs: drop shared NUMA mempolicy pretence

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Message-ID: <ZRIFDYUokzCtK0oQ@casper.infradead.org>
Date:   Mon, 25 Sep 2023 23:09:17 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Christoph Lameter <cl@...ux.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        Vishal Moola <vishal.moola@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 01/12] hugetlbfs: drop shared NUMA mempolicy pretence

On Mon, Sep 25, 2023 at 01:21:10AM -0700, Hugh Dickins wrote:
> hugetlbfs_fallocate() goes through the motions of pasting a shared NUMA
> mempolicy onto its pseudo-vma, but how could there ever be a shared NUMA
> mempolicy for this file?  hugetlb_vm_ops has never offered a set_policy
> method, and hugetlbfs_parse_param() has never supported any mpol options
> for a mount-wide default policy.

Hah.  I was wondering, but never cared enough to investigate.  Thanks
for doing this.

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>