From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.149 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793515175; b=4vNFhvV7Xkd5IlJsu2tqV7Tn52xEBopL7uxArJG4uE3Ig+vn7HM2CuIaDoaAd4BAC4nE 2Xhay3yW0eWn5UhUsdwg/39xLH00kQX6nrvdPNHFdjUZH2tajEiB8EFZ+KBmdXHW53xL2 l6Jw/iWkiEuyPt6okjGrMTmWYYdasnnHvhK/9Krn4saF8BZQzZBbIJzZtgKb4kUVGoTkU Vg31+4A6ExnxZT2zZO7/MgShHnle+cFXdVZ40FZHZedvCpu1Piw9PTbWd3snISvqQb7Ho oAwWCfyT71Okc0gytVBM6f+gwsXAjEhQnmIlJidUleaR45WF/XuzRxJJsh+s0UDRypA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793515175; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; bh=UNuwgZxs8v17OaRi5wYNgk0NBjjWdX2IWjeKGNZGg80=; b=PZ3hmy/Nd9JWfQhZomdOnuyY/Q6EenhxMrHjgvrniR/VQmISRAtvySz2tKmthlCtCGd/ CS5iuVSGJ91+rI8x+ipnb/KbM/07C8j9MwB+9zvs0V+DCO8ypAoVNh63LdIRaL51yBh1Z xi43bi3rgofMfHt4KomAl1cUi3zGeKR0EYktLBJkunPlQvIsaCmZM3Y3388IqlPfRY9P4 qdvZ2GA32KIF+eHcUDR1jgszDJYb/75mX4S9PXLrdfMGOxTVyFp1KjATH/rAPVioPiSZM +M7Hs2p58ZUBjv+FJOUtPMIlGSZvm8TwvIR3jSo2bDHEPdVSjFP+uIpWOj91sVNPg9g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=MLrCcQeJ; arc=none smtp.remote-ip=95.215.58.149 Received: from mta1.migadu.com (out-149.mta1.migadu.com [95.215.58.149]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50136606A324 for ; Sun, 1 Nov 2026 06:39:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 50136606A324 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=MLrCcQeJ X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=Jv2Mo7I2fjHgwZIVG8WGkD+xa/rkd22ydPpwY3VwsqI=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793515172; v=1; x=1794119972; b=MLrCcQeJ4CA7vY8IVFsWbVTfQ005iuULp+doAldRXuEchelse5tEe0nUQ0YbG3urXNaLFWtb /zfF8jjphfS/DQgOsXmpWNcocxGA+5FDghvkrMV+Sbqejxtx5krpFrL7QOSWQxzNNdE+8yMJC/r B8rzaTt8upXygCpuzzvxW4yQ= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id d9cc37b665f33f48; Sun, 01 Nov 2026 06:39:32 +0000 X-Mizu-Trace-ID: d9cc37b665f33f48 X-Migadu-Flow: FLOW_OUT Message-ID: Date: Sun, 1 Nov 2026 14:39:22 +0800 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 04/12] mm: hugetlb_vmemmap: generalize vmemmap page allocation To: Muchun Song , Oscar Salvador , Andrew Morton , Mike Rapoport Cc: Lance Yang , James Houghton , David Hildenbrand , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20261020115306.813483-1-songmuchun@bytedance.com> <20261020115824.823278-1-songmuchun@bytedance.com> <20261020115824.823278-3-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20261020115824.823278-3-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/20/26 7:58 PM, Muchun Song wrote: > Vmemmap page allocation is currently tied to restoring a virtual range > and assumes an empty destination list. These constraints prevent it from > being reused when pages are requested independently of a vmemmap range or > appended to an existing list. > > Generalize the allocator and give it an all-or-nothing list contract so > the restore and optimization paths can share the same allocation policy. > This also allows HVO head-page allocation to fail gracefully under memory > pressure without triggering the OOM killer. > > Signed-off-by: Muchun Song > --- > mm/hugetlb_vmemmap.c | 40 ++++++++++++++++++---------------------- > 1 file changed, 18 insertions(+), 22 deletions(-) LGTM. so: Reviewed-by: Qi Zheng Thanks, Qi