From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793984249; b=EeJ8HjR+/FOL3IGAO2fgMYDaUErlYb9xHK8RLNOjJC2On2QAPrkwtWdt1vb6Ejg6Ykau kwtOJdpk5TzSaujypepZtqSsd9Ygxeo0pTYSqZvBBiB2JVrPL1ZoDVBOkywmSeRDZk3dH b4/riUJj0vAKxZn037ojCnPQo4/iVIC5BYrPCcrlPpGYP/GhiO+ebAbBmqv/79Yr0QnMB 5MSOnrNbT/Bo29pJeS40t3u7N74bfTj3dDFbJX/8zhWbXo16Zz+IkWPIFTJm6c9fAWbPo OTIb5LosdC4NCp6dCbZ8IcCHDbrigmuIoM4zJHPKzN30bLiVGRjcwisbmZ54TC12FUg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793984249; h=Received:DKIM-Signature:Received:Date:Message-ID:From:To:Cc:Subject: In-Reply-To:References:User-Agent:MIME-Version:Content-Type: X-SA-Exim-Connect-IP:X-SA-Exim-Rcpt-To:X-SA-Exim-Mail-From: X-SA-Exim-Scanned; bh=0GkE8hZIJYtd3UHUB9YTMTqSfhEImKLinoLGGzd5XkM=; b=eI5wB/440/wfuFJYzL58Fo5R+rzKClCnSH+sdsUkalYsVSt5YBbom47avu4Hs9JXk2ur z4cxocE8E3jl5UYzB0Puq8K3wHXVO+71hWTH6QJK90Q18ZzxFAl00UKP7bNMWbTYlsUtz 2mlRVoV5pLdfK2Eb3BvJAvXmMY+o0y2rv64KuhkQUrUVCd4aMkrgeJTqooZKcYSie/FGx 0rr0FFAymayTLYxoqQO8my/kgDGn4O8MGwTJVHvSurMRFIQI40uazCp/kQS5FlCkhUszn CoJAzvxm9GfatixzOqftn8llX8ffDfsLMOAWPNHHIheOJBpWw38SCCyHtUuIoDwKFvw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=NCdGM8rw; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0ACA2606A326; Fri, 6 Nov 2026 16:57:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=NCdGM8rw Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8A9C11F0089F; Fri, 6 Nov 2026 16:57:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793984248; bh=0GkE8hZIJYtd3UHUB9YTMTqSfhEImKLinoLGGzd5XkM=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=NCdGM8rwN5bCNZ6rWdVxDrw9mInGo/n3xAuqFE5kst2Q9pV8Pxq6AgwKmPDqem4XK KlTApBAXNvPKpIuk7Dp0jcuGjSnQYAut++TKz/rGLVu22G1U9HHPqSFhMABL5fX3v6 ubrOEiJCCT5mDGt2a+HCJjnGll4dB+Dj+trUGB8ybQyiaWYiRGDErq8yTWcKfQ51wa CjwhWQBNkXc2V4aWq8WXZO34/HGawc+tqMuSSEmq+oVCMK8/xnEbRIMU6etL+6a81L LKKDTjL6RKDIVBLjZ7H+irbg+1mndAq+FQiGkxz7CFp/VxVAXr1cKcKs6+mIJj7qIo qF585rUxNhVRQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1xPNFm-0000000CHU4-09ZA; Fri, 06 Nov 2026 16:57:26 +0000 Date: Fri, 06 Nov 2026 16:57:25 +0000 Message-ID: <86y0b528zu.wl-maz@kernel.org> From: Marc Zyngier To: Leonardo Bras Cc: Oliver Upton , Fuad Tabba , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Raghavendra Rao Ananta , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH RESEND v4 0/3] Optimize S2 hugepage splitting, introduce skip-level flags In-Reply-To: <20261106161240.1345126-1-leo.bras@arm.com> References: <20261106161240.1345126-1-leo.bras@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: leo.bras@arm.com, oupton@kernel.org, fuad.tabba@linux.dev, joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, rananta@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Fri, 06 Nov 2026 16:12:35 +0000, Leonardo Bras wrote: > > > While playing with dirty-bit tracking, I decided to take a look on how page > splitting works. Found out all entries are walked, even though we don't need > to walk the level-3 entries, as they don't need to be split. What's the point of this "RESEND"? Anything different from what you sent on Sept 30th? Since it is still numbered v4, I assume nothing has changed... M. -- Without deviation from the norm, progress is not possible.