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 102282F7ACA for ; Tue, 6 Jan 2026 20:25:52 +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=1767731153; cv=none; b=JSASQhikRLTctEB78uUv7lL+HylojqnMFP7fOBqDSz5uWnlGT2HcKgTNUud6VMjiuqUZ/bLMiwxwf/FQQg6rRxT2bCHf1ejyVIQpnIhnauktkK+ruWzt786xiD/zRFBtfVu2k/z5hkrCEyIM9ypgDoeIIKd42/6tjvQjhUPepmY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767731153; c=relaxed/simple; bh=Dz+Lc1Wqi1e27Q3BsINgvQycs+Ztxr7fWqxyK9DreGc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ifH7wwUuK63C0PY3p5hxuD9WD/3c8FmELtsW93JUmKDlpk5cwjxOVX5gJpeMQx1ajJcmjtWj/CZRuFBa2NAzEm+glp64uZlKmre77f0M13T6Y7He/6Y1x2FZzvY0aK4g/rm0D7UZjpMiOi5D4si5Ow4g4WeJwu/pZSQ/8cELuL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i4M2Vt8t; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="i4M2Vt8t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 365B2C19425; Tue, 6 Jan 2026 20:25:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767731152; bh=Dz+Lc1Wqi1e27Q3BsINgvQycs+Ztxr7fWqxyK9DreGc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=i4M2Vt8t+iXsimUBfFryQzKxDVUNh+X16Be+6zz0OBm5BDgOAKAi4d51E209oq8nU d7G5EDG1XuXhm2KISFZ/cMIcWvj2jQde8slkqDeP7FLUYE/WrjiTdJcA4yHPG+YakN 1j78ThWty65cASFAHDHYYqKEE5Eek4FWldmeh8eQnz/Sr5DA3SUdXPJcurhtF/g0Jv k3LZ8nK37nAWnNqPX8onoehwkI8AmlGgnYbupWg0EhCJOlDadGb15LV1+80Myi8sTR I/mcAd/4yRfHAfHJI89pFfDv79lvL26aosiycfdBM6zYt7ENbG8u6TKqBBbua4M4xS McQQTzNCq1YmQ== Message-ID: Date: Tue, 6 Jan 2026 21:25:45 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 2/2] mm/memory hotplug/unplug: Optimize zone->contiguous update when changes pfn range To: Tianyou Li , Oscar Salvador , Mike Rapoport , Wei Yang Cc: linux-mm@kvack.org, Yong Hu , Nanhai Zou , Yuan Liu , Tim Chen , Qiuxu Zhuo , Yu C Chen , Pan Deng , Chen Zhang , linux-kernel@vger.kernel.org References: <20251222145807.11351-1-tianyou.li@intel.com> <20251222145807.11351-3-tianyou.li@intel.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit One more thing, the fact that the clear_zone_contiguous() happens in move_pfn_range_to_zone() is a bit suboptimal. Maybe we need a comment here like /* * Calculate the new zone contig state before move_pfn_range_to_zone() * sets the zone temporarily to non-contiguous. */ Or something like that. Alternatively, we have to rework the code a bit that this dependency is a bit clearer. > + new_contiguous_state = zone_contig_state_after_growing(zone, pfn, nr_pages); > > /* associate pfn range with the zone */ > move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_MOVABLE, > @@ -1204,7 +1273,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages, > } > > online_pages_range(pfn, nr_pages); > - set_zone_contiguous(zone); > + set_zone_contiguous(zone, new_contiguous_state); > adjust_present_page_count(pfn_to_page(pfn), group, nr_pages); -- Cheers David