From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7F3F2F46; Tue, 4 Feb 2025 13:16:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738674981; cv=none; b=bRYvoO8yzszFNWecl1gyIU78+qOlXbxRomW7HZHMmUnKZp6l6GJy2oPcJVCkx5M+I+UEqlfb9W38Hbo9g54LkXN3etFgwJA+yh/mWZbJ7z6b8rJQKBzU/kQ9qF6q/kC2pcUviM2ArpQvl0Vi+7Tzk6G9OMRWcGSfsp1hTdIAe38= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738674981; c=relaxed/simple; bh=9BVtUC2dRYqRRAzPmjV+IpydnNfRfTZ+iwtUkO71hos=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DUAnmbW+qkIqjw0ZilwWO/b3DjkfA7iPXE7kmEraZ6aIfQMepxRDVfxv4dufYDfG17SSpEQ3ADnyPGGVfXydZ/QOHQWP4HxNL5pDyRGv7xRY7gG/wZOXz9pOhdCaVPznJCfCH1xn4lYTeXb5KdhDoOYxpIJUWklmNdv8O+Mn5TU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 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) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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