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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qktlV-003vbs-VK; Mon, 25 Sep 2023 22:09:18 +0000 Date: Mon, 25 Sep 2023 23:09:17 +0100 From: Matthew Wilcox To: Hugh Dickins Cc: Andrew Morton , Andi Kleen , Christoph Lameter , Mike Kravetz , David Hildenbrand , Suren Baghdasaryan , Yang Shi , Sidhartha Kumar , Vishal Moola , Kefeng Wang , Greg Kroah-Hartman , Tejun Heo , Mel Gorman , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 01/12] hugetlbfs: drop shared NUMA mempolicy pretence Message-ID: References: <2d872cef-7787-a7ca-10e-9d45a64c80b4@google.com> <47a562a-6998-4dc6-5df-3834d2f2f411@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47a562a-6998-4dc6-5df-3834d2f2f411@google.com> X-Rspamd-Queue-Id: 50B07140017 X-Rspam-User: X-Stat-Signature: 87fu8ijz5ni5mq64upfgrcux84q91rt6 X-Rspamd-Server: rspam03 X-HE-Tag: 1695679790-668272 X-HE-Meta: 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 kfQ158bT AAuQ/tFz8UzjS0Yn0KT10umJ2YYJv5eqq2tJdm7+hZFbLWe2fXITigiy2iApFhOikgzGs8cExde6u5YF9IiV7iGDxXchQS3o6eifBi9gXWvJ69PNWjMavHZyiepLuXvKJIOW9OY6ij9peXs2fL5Z08baXtQrgTADCh/fxSC58JZfIirX7NZ4TWksSrPhDbP3qXwG05Cz3DOy5WA1cS34XNqqFzbd8yi0Mrax80n6DS2Dv5kF9vmSd/WPEG0EbRKGnUG9Hb1//oKu1a4s= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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)