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([2804:1b3:a7c3:574b:39fe:bdee:79da:4995]) by smtp.gmail.com with ESMTPSA id az10-20020a170902a58a00b001d7274cbd33sm8748252plb.121.2024.01.31.03.30.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 31 Jan 2024 03:30:40 -0800 (PST) Message-ID: <87aa8879-8590-4cb1-9ad1-563c09707356@linaro.org> Date: Wed, 31 Jan 2024 08:30:37 -0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] nptl: Disable THP on thread stack if it incurs in large RSS usage Content-Language: en-US To: Florian Weimer , =?UTF-8?Q?Cristian_Rodr=C3=ADguez?= Cc: Wilco Dijkstra , "libc-alpha@sourceware.org" , Cupertino Miranda References: <20230420172436.2013698-1-adhemerval.zanella@linaro.org> <4115d7fd-d7a7-cdb1-3833-daf45186480f@linaro.org> <967b94b4-d819-278f-1782-6b758d0841b6@linaro.org> <877cjqym2n.fsf@oldenburg.str.redhat.com> From: Adhemerval Zanella Netto Organization: Linaro In-Reply-To: <877cjqym2n.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 31/01/24 04:54, Florian Weimer wrote: > * Cristian Rodríguez: > >> On Tue, May 23, 2023 at 5:48 AM Wilco Dijkstra via Libc-alpha >> wrote: >> >>> However even switching off THP for all small stacks (eg. default size or smaller) >>> would avoid the random use of THP without needing to set the tunable. >>> >>> Cheers, >>> Wilco >> >> >> Didn't found the exact message to reply.. but this one is close enough. MAP_STACK implies no >> transparent hugepages since linux kernel commit >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c4608d1bf7c6536d1a3d233eb21e50678681564e > > It's an odd choice for fixing the regression. I commented on the > linux-mm thread. It's also surprising to see such changes being made > without larger discussion. Do you have a link for this discussion?