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Tue, 19 Sep 2023 11:48:19 +0200 Message-ID: Subject: Re: [PATCH] sched/fair: Do not wakeup-preempt same-prio SCHED_OTHER tasks From: Mike Galbraith To: Ingo Molnar Cc: K Prateek Nayak , "Peter Zijlstra (Intel)" , linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org, x86@kernel.org, Chen Yu , Gautham Shenoy Date: Tue, 19 Sep 2023 11:48:18 +0200 In-Reply-To: References: <20230816134059.GC982867@hirez.programming.kicks-ass.net> <169228500414.27769.13366308319134164264.tip-bot2@tip-bot2> <21f3d376-17d6-8fb6-5f35-507ea931c0d3@amd.com> <02f6a15f094adb3c8d9957b031941d6bd10c2e43.camel@gmx.de> <0e153dd25900af70f91e4a73f960320e6daf3c6a.camel@gmx.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:jf/XS+uy31pNwDB1WpOQAbU5X4oJevQUkU0y/cd7aonWjMKNZbg w80zwerv1j+SFocsJYJlU9DDbaHPS+pHlr6iWj2Ko9vCWIsP6YlbXi/P4EJadQbltsp4eyy 9Uw5X9ywqiMxLb82nZh7TekYiBcxYmnVqsU4AYcbAwWzze9eMwzYi1aeltj0/exb/5bBl7i 7OJo6+FIVISC764rbx3qA== UI-OutboundReport: notjunk:1;M01:P0:APciL2NUABU=;Oi5zvvD3gtCH2LA/eaFz4SMzUjX yANLWNIRRdBvbl8Iptd35btU9qjLijPtjnfGA3jHNkgZh4c7KZL5Rxj3RTZJojVtXT9tyStRV q0273oGPnssf3cFdBS6IZiaAM15uTgs66zwS6JpLryppY3yjudtu8UDDrxWNK4TPsxCCPepyj 2P5IY64DP72F9D/YpB8lUSBTurupqLbTBq2fTi76tD6wD7U8zvUcm7bGGkyRBjmEOfA9VU/qa bRGVmjhrGumn1GnWd+KVL0BR/p+TtLC/qB5KVeGQ8fTrHMeMCZzausyRM1/1d+z7QEsOukJVy GydAGzHYE7u9L4VdFd1mRLPlVeHkCqRbvf8N8uVsT5kywENFPUC2lJV6bzckxY+2H0Z8eqFpc LS+z4AlkLPrGrcxFAlkSD/L9vPeQog3RBGESYqfBBsQ2m//LZyGXJklBvt0vOqpilNbJmROyV KjhFfYHv1yu9s61JBgiyAUpbdORVIScJpLwUXRk1AqtvtdPMSpCBFs2/ZvL8LTdUVRQocLBOY uFRSv/cPJHuC+9u/4mEorCluNiMia6owYTMVIR28mccSEZHcOCGEXWvoaq+oA8I2EW1Xm6r4L lWMnssXoiEyBoEAhYGj6hVaHF1JExwR65a9ClArXWfVAoMultWKj5FtCJGoXypg6qv5y64Us+ hZdBaYXW2RTcbDFVbkcVcBMhsOY5r0q6J/L8/ONrc4pNR9CQb3QHb63KGO5wdJ23nBnjWPCDS IOdPe8WE+2jSOXfrvUVp07MnXPZaPQK8QJsapYU+19IQpfkYO+RwA8j9wheFQukgy9v+g+Zn9 K/FLHvU1ZnK7kv0TG14t5CTWYxfhQZJqTx8sKdDgk4dA0VY0mMISXp5X1NPE+25Fi/Nfd1py2 r6wIAA1ICSMcwX4Nu+1s21B0pYZQFZ8U2OTZwDY4Gl5DNKJPqBAFBkv+MThAl99sOX8K7JIRg 6kLBmfuiZ9gkd22BY/L24c0+kLY= X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 19 Sep 2023 02:49:04 -0700 (PDT) On Tue, 2023-09-19 at 11:02 +0200, Ingo Molnar wrote: > > BTW., if overscheduling is still an issue... The trouble I had with overscheduling was mostly about annoying insta- preempt creating useless overhead, and that the RUN_TO_PARITY thing ended. All I see now is the expected 60/40 indeed !=3D 50/50, so things are gonna shift a bit. Most of the testing I've done lately has been due to fretting over the desktop perhaps getting the short end of that shift, but after much poking and prodding, everything seems just fine here. -Mike