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Received: from [50.53.4.147] (helo=[192.168.254.15]) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYnOB-0000000FMxE-3rxT; Tue, 30 Jul 2024 13:59:43 +0000 Message-ID: <83aa31ab-d0a8-4375-aacc-75bdb8d0c0e0@infradead.org> Date: Tue, 30 Jul 2024 06:59:43 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6/6] mm: split underutilized THPs To: Usama Arif , akpm@linux-foundation.org, linux-mm@kvack.org Cc: hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, roman.gushchin@linux.dev, yuzhao@google.com, david@redhat.com, baohua@kernel.org, ryan.roberts@arm.com, rppt@kernel.org, willy@infradead.org, cerasuolodomenico@gmail.com, corbet@lwn.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@meta.com References: <20240730125346.1580150-1-usamaarif642@gmail.com> <20240730125346.1580150-7-usamaarif642@gmail.com> Content-Language: en-US From: Randy Dunlap In-Reply-To: <20240730125346.1580150-7-usamaarif642@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: nfy5es5d4aued8c416didf87x5jgduss X-Rspamd-Queue-Id: 3F6404002F X-Rspamd-Server: rspam11 X-HE-Tag: 1722347988-434244 X-HE-Meta: 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 4fSOXyTY /QeDOEkktkpJhiUomV2kkMRFlj0y0X2HQRS3LRLY3l7JBkPpvgsB8XSk18mngtOrLPcG7vGvTSmFeQsjnmrydyibxoxWfzBWcgawwCT2GBQYqqDgAQBSNmG+eHRXVm26pVJgiRP3Q3y/+2JV4CASds2M9m9aav8Chzb7o8U5QHxzkKmEhcrGKr4usZPB8OppD1NBCGk6LWHKNr+O5mip/FDVdyVRTD7Dgu/jBZ4LkoFqB4vnGlut/ECcNw3ExImiC0HWb 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: List-Subscribe: List-Unsubscribe: On 7/30/24 5:46 AM, Usama Arif wrote: > diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst > index 058485daf186..24eec1c03ad8 100644 > --- a/Documentation/admin-guide/mm/transhuge.rst > +++ b/Documentation/admin-guide/mm/transhuge.rst > @@ -447,6 +447,12 @@ thp_deferred_split_page > splitting it would free up some memory. Pages on split queue are > going to be split under memory pressure. > > +thp_underutilized_split_page > + is incremented when a huge page on the split queue was split > + because it was underutilized. A THP is underutilized if the > + number of zero pages in the THP are above a certain threshold in the THP is above (if the number ... is) > + (/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none). > + -- ~Randy