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[91.12.98.106]) by smtp.gmail.com with ESMTPSA id n1-20020adffe01000000b002c4084d3472sm12381283wrr.58.2023.03.07.02.10.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Mar 2023 02:10:24 -0800 (PST) Message-ID: <278ec047-4c5d-ab71-de36-094dbed4067c@redhat.com> Date: Tue, 7 Mar 2023 11:10:23 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: THP backed thread stacks To: Mike Kravetz , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20230306235730.GA31451@monkey> Cc: Rik van Riel From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230306235730.GA31451@monkey> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: A47D2C0004 X-Stat-Signature: nf6qapcr3f9scp3g45y4tyf5bayxseb3 X-HE-Tag: 1678183828-729707 X-HE-Meta: U2FsdGVkX195fniHyQTqPwwi2OjTDACAdhoNeKVHy8kSTQEl6QkexHmEcBIizECoPlPLw0PvXtug/i1W8MG7DGvJB8qaWL4nrypgva3fo17ISTggF5dJdpLvzD3u4d+rv0i6oI56IKM6V0Tdn9v9beAToaw0prYolQ32dc5X4GoiHeLqYrIGQAZsUO4vTdbjngmQ83DizZqYgnYrMzDbfcClSGdrJQivqOaiuUce+ZGdVbj+7mMZzLx59TXxIAru7AgAuwGSEPR6Pg0nOf8YZTrx2XVkyb10IHMv7yAgGAEOiDv7F4xoDOM0ZaAjihuzAsHz9QLVWZimtuJeg6OjlAlZh2IIJ2BU905Qo7oQs4ysc35vB6bVhIuz41LqFLxJ/FWPiqNfdBTzTgU+7TZqEAnAC06BCqn6r1k+sSuTjf50byx+dB9RoztfDDREzg8TpO0hyGK2xBWJSxuuvoEFnGAsEd8VL/beMHj9JadBy+DQfcx+QOq09kDGNpO9eQyAQ1luu2/vOElS/uZSKyyU2BHV/gE/p6iZ4atl3Sfx/7rboaycWKSlIqwssMJ5FcFY4RwMfX1WXIKvslT+81N+7uZWzJtFQifACjyjSha6IdXQO/6UsUWFjI2h0NUCOpj8M3Pv020tlZ8Ae/wjLR6IW/G/TEFH6XCgUptciA11qhy7/9Z5eKG0ZzFLww85XcJnImq9ejYk2o0FgC5RbqBTm1JGpo0geEvloTt0Y4+CDJaOnmB8mWAT0l147GN9dk8Mx9lkGkVIBcndNox8rZ03SB7OYPxn6gHS6wBIyd/A5TH7Ltfn3Cvq3IZp6JfDSBCtkceW02E8e1eB7+eo9OwV9Ym9DJY9SGrQKz5RI3gmhexQWIFyG8szLVgpMSoQ5hh/4LoPlC8G+GlUtXC9x8bC4KfpP/IRiz5kCIrn3qF5XbOSKLGWef7Of32EHbHcKdLgIf0sYv0/QszD/RqNSLp m2BEslY5 DapyTp/YMidQ5WtsP5OWoGNQ3yms8X2B0zbEHNDlis5FZJxKZSWYCIh8FQuPniKKFkRURhKz+mXZXLTkrhFnKrJmnGLH+rGHEQ7pUv5cOOlMDaBH0nYyhPeFR0qYllYOouLBG1jIAgbqmql1aOFXnZ4wE5OiNMomd4uAgiIh4uUnmTdidSw7Ykm35O6LYHq5eMAGDzqfVkvv2Ae7Sb+BJyOFyslliUZ6Y6AaAvqNHclUYxNvp9uZ73PbC2/9JbaRYl7d0N45JHVZon+mVfRnPhbQKx6OUVkYy99nZG67JJ8I1fphhfFLfi8/X2LxE7RuoHQXbH4sPNKE2JSbaKFfioXDnvn9rbcZZB5d1dFYWLh7s4Xdx9/tO3ia64gTbTdgN6wHp 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 07.03.23 00:57, Mike Kravetz wrote: > One of our product teams recently experienced 'memory bloat' in their > environment. The application in this environment is the JVM which > creates hundreds of threads. Threads are ultimately created via > pthread_create which also creates the thread stacks. pthread attributes > are modified so that stacks are 2MB in size. It just so happens that > due to allocation patterns, all their stacks are at 2MB boundaries. Is this also related to a recent change, where we try to always align at PMD boundaries now, such that this gets more likely? commit f35b5d7d676e59e401690b678cd3cfec5e785c23 Author: Rik van Riel Date: Tue Aug 9 14:24:57 2022 -0400 mm: align larger anonymous mappings on THP boundaries As a side note, I even heard of complains about memory bloat when switching from 4k -> 64k page size with many threads ... -- Thanks, David / dhildenb