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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1738674983; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9BVtUC2dRYqRRAzPmjV+IpydnNfRfTZ+iwtUkO71hos=; b=llzUOK/AsiKQ+GQYX6OKXfgVlPR+FuXTkYJyQ3AhyG9b3QLZP++c+r/dsbb3BC1LzLeEkZ QemmVt5s75NvbH1tDPdz30JQEAAutIXZLUw2orndUwXrnHVL6930lZArTM8MCVVF3/qTve iUC4kBmt1OtPwbXiiTB73SIBaXG/fPg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 3EE925C5D42; Tue, 4 Feb 2025 13:15:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE861C4CEDF; Tue, 4 Feb 2025 13:16:17 +0000 (UTC) Date: Tue, 4 Feb 2025 08:16:53 -0500 From: Steven Rostedt To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Thomas Gleixner , Ankur Arora , Linus Torvalds , linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, Joel Fernandes , Vineeth Pillai , Suleiman Souhlal , Ingo Molnar , Mathieu Desnoyers , Clark Williams , bigeasy@linutronix.de, daniel.wagner@suse.com, joseph.salisbury@oracle.com, broonie@gmail.com Subject: Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice Message-ID: <20250204081653.18dfe905@gandalf.local.home> In-Reply-To: <20250204075100.3fcbfda8@gandalf.local.home> References: <20250131225837.972218232@goodmis.org> <20250131225942.365475324@goodmis.org> <20250201115906.GB8256@noisy.programming.kicks-ass.net> <20250201181129.GA34937@noisy.programming.kicks-ass.net> <20250201180617.491ce087@batman.local.home> <20250203084306.GC505@noisy.programming.kicks-ass.net> <20250203114537.6a30c7c0@gandalf.local.home> <20250204091613.GQ7145@noisy.programming.kicks-ass.net> <20250204075100.3fcbfda8@gandalf.local.home> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 06B09100017 X-Rspamd-Server: rspam10 X-Stat-Signature: dkc1yoz6pnwfjs8t5m9q6atq4ho371g6 X-HE-Tag: 1738674982-84390 X-HE-Meta: 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 QdBLIjhY RwVrTMn9OazQxPt3xGcQdIAYgYpf5Fb8cs2Xk7p+OGtLx0hdvi2UKvxLj8yuMyIxWv+AIPfxblMuTC5yrPof6lLfhirbMXu33WrFZbSAJ63EVJUhXpXaqqOEOT7U0h+noCVD41wH9rxHbR/9v1LDZceA/BEEuRW6M7GDW/XXUxWN7y93BuwzFRYkK8H8svX7pNfVEqhYDNRkPsIvwFJQoCA5c3RR4yLKgSFUC1C/11yOThRpWh9XoCNFHqIbo895Xdy7vddrTFPSI8xchQDVypOzFBjayZzWJtSMHPzMmmWagqASsQG0LOxqEKYcsGfdww6MWqO90S1foC+O1FaGaCTh2UXV3M1YQnWe7AYbJmXZpkftTWTTCCMREQFCwR8CwkPg7 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 Tue, 4 Feb 2025 07:51:00 -0500 Steven Rostedt wrote: > > I'm so confused, WTF do you then need the lazy crap? IOW, the "lazy crap" was created to solve this very issue. The holding of sleeping spin locks interrupted by a scheduler tick. I'm just giving user space the same feature that we gave the kernel in PREEMPT_RT. -- Steve