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[70.30.145.63]) by smtp.gmail.com with ESMTPSA id m15-20020a05620a220f00b006fc9fe67e34sm124647qkh.81.2023.01.26.14.48.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:48:08 -0800 (PST) Date: Thu, 26 Jan 2023 17:48:06 -0500 From: Peter Xu To: Mike Kravetz Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Naoya Horiguchi , James Houghton , David Hildenbrand , Michal Hocko , Yang Shi , Vishal Moola , Matthew Wilcox , Muchun Song , Andrew Morton Subject: Re: [PATCH 0/2] Fixes for hugetlb mapcount at most 1 for shared PMDs Message-ID: References: <20230126222721.222195-1-mike.kravetz@oracle.com> MIME-Version: 1.0 In-Reply-To: <20230126222721.222195-1-mike.kravetz@oracle.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: DDAA616000E X-Rspam-User: X-Stat-Signature: gnbxeans333gftyhn7odg38pd5qbewo9 X-HE-Tag: 1674773291-950495 X-HE-Meta: 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 FLWNx3x7 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 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 Thu, Jan 26, 2023 at 02:27:19PM -0800, Mike Kravetz wrote: > This issue of mapcount in hugetlb pages referenced by shared PMDs was > discussed in [1]. The following two patches address user visible > behavior caused by this issue. > > Patches apply to mm-stable as they can also target stable backports. > > Ongoing folio conversions cause context conflicts in the second patch > when applied to mm-unstable/linux-next. I can create separate patch(es) > if people agree with these. > > [1] https://lore.kernel.org/linux-mm/Y9BF+OCdWnCSilEu@monkey/ > Mike Kravetz (2): > mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps > migrate: hugetlb: Check for hugetlb shared PMD in node migration Acked-by: Peter Xu -- Peter Xu