From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 2CBE73A6B64 for ; Tue, 7 Apr 2026 08:29:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775550576; cv=none; b=tzxTN4nKy8xNk2KgPfzpiPix3E7d+GE8zYEvex5MMNMBzW2lmx2lydLprbvYktUQNNE3jmj6FV6KLU6zzPR/KAnCkVW50m32aZws5HXKNX180ynmKLk/T5q3hypYuU1QplczSTRniEYVhwSO96DHaUP1fPl6fUZP7zNbPAm4KVY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775550576; c=relaxed/simple; bh=QyYmXKJ1EWHSmjpxtrqzgksJ1JB3VtEP+eb5V6xZBpY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=OWly06AMe0MrzEPei1UoXbb6fKpEz8+SKhbg4WQsaaDcfaeZMW9hy+mwK41BJvF9nt5scNLs06CMrYKgi5pXs0ERu8UN7UY1dF8HbyW5hQo9ZUNdEmR8q3InAAFCpzmn522b68CCHMf3PoM1B0yq8ium5IxEKcBrhreBBrRHWpU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=JRxd+4Nh; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="JRxd+4Nh" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=QyYmXKJ1EWHSmjpxtrqzgksJ1JB3VtEP+eb5V6xZBpY=; b=JRxd+4Nh6Y9Sqhb0lMTTndPt1b MUPOMWEDqhVIZGSTWGDUJ999xhD4rhmWNW9T5v3+rwPh8x98fnVbTjZvMErWqc1wrJoCdCmmWnZeO xDklC8EpBegTSe+b2UJDBb1Wzl+8u6uQ6WwtvYeFjGAmnBHgX+h6mhBkbt8VLqMhwSsNK+NoHOXHU B8LPZI4S6Byra99b2RS0lKD9WPhjrRdUQgc0WinDxH5b7bL3914TPKBi/Nk3ZGIH/pwnsP0iuIJZZ fFvj1CnBXX028DVNrcmnQHIZyHEFeri0MMZq/Zufl050/vQpDZL5u09/P4AjY/j+F6BhZiejlsIJB 54XtIj6w==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1wA1oM-00000007qSD-1tBG; Tue, 07 Apr 2026 08:29:26 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id ED05A3005E5; Tue, 07 Apr 2026 10:29:24 +0200 (CEST) Date: Tue, 7 Apr 2026 10:29:24 +0200 From: Peter Zijlstra To: Andres Freund Cc: Ritesh Harjani , Salvatore Dipietro , linux-kernel@vger.kernel.org, alisaidi@amazon.com, blakgeof@amazon.com, abuehaze@amazon.de, dipietro.salvatore@gmail.com, Thomas Gleixner , Valentin Schneider , Sebastian Andrzej Siewior , Mark Rutland Subject: Re: [PATCH 0/1] sched: Restore PREEMPT_NONE as default Message-ID: <20260407082924.GE3738010@noisy.programming.kicks-ass.net> References: <20260403191942.21410-1-dipiets@amazon.it> <20260403213207.GF2872@noisy.programming.kicks-ass.net> <1pgulz0k.ritesh.list@gmail.com> <4q4zsstjeef63sdkl2az3tziy3etorzzxyt2k4nhwokpmegsr3@y6w76kosjzts> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Sun, Apr 05, 2026 at 10:44:22AM -0400, Andres Freund wrote: > I'll look at trying out the rseq slice extension in a bit, it looks like it > nice for performance regardless of using spinlocks. Thanks! It seems to work well for the Oracle folks, please let us know if you have comments.