From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 5668C3AFCFD; Thu, 6 Aug 2026 14:11:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786025492; cv=none; b=eirgop67IQWaXr2ZwHg5B9iy8evu5YaWgjdPCHXI0yA4GqiTQ/qKvWevuB+pkXpdexEh1gW1GAF+U3UbQtYF05tq62zRc3wZRVyt7i3N7EK9RZVURsnEH3DRAsn2LL19/jmIN6sLvBYVzpRlQ/AiPzyIL1jx4DRyu0JbnGPpoY8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786025492; c=relaxed/simple; bh=TVtFWLcLjunrGGAO67PFN2XfbtxAP6X2TDnibhzaEX8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=BYzZ78xBem29KoyVoydFgcsX0dTyaDsBpaoRGHZyUFKj7OnVx7djd43QuyVDRLMEt0J367zIDwo7gJVbmsS8ZbmeOEMQLBlgRLjo8LMTtWG8DDW5AMi88UJTh08KCFlxwcEQxFQLjY0TamaJBx8j2WftB/GOH09Wuv32KwDHAKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y24iLrIS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Y24iLrIS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B86BB1F000E9; Thu, 6 Aug 2026 14:11:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786025491; bh=65i6FrR9vhea/DAYh2XexXtxpmMYsDeJ8g7jw1MIgIw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Y24iLrISIRCxqBy09WsFAtvLEaKG6le4hUJgBLkg4y/DYrgWr6N6Ei/HxjnURUs3t T4M4rspvFEOWnkkrwF2e9DsvwykqFjeEKwZaJYimS2AzBKTOzDARvlZoNyIbMVNsIi 262yr/Os9fyYOTcmj/QJohN5MjUch00k0S3WV7IZ79VSv2TpedqPjrs3sl7/tYZOTR zSDAF+vAqhTG5Sxn7t4957as4SrjDqPUafo08znQOIL+LGNmSjCi2tFkKJ7DKXAWCz FDZ/aNtW0Qe0lAB3EzfJ9orSGzFOiOTScw17mUHw+0TelN3m/+Bdm3z3ufvknNZtIE NWE0r0B1CZmFg== Message-ID: <0c90b9ae-48ac-407f-9d73-4c501c82cf40@kernel.org> Date: Thu, 6 Aug 2026 16:11:21 +0200 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 4/4] mm/mempolicy: skip zone device folios when queueing folios To: "Lorenzo Stoakes (ARM)" Cc: Gregory Price , linux-mm@kvack.org, damon@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, sj@kernel.org, akpm@linux-foundation.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, vbabka@kernel.org, jannh@google.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com References: <20260728194714.3713735-1-gourry@gourry.net> <20260728194714.3713735-5-gourry@gourry.net> <82f6afba-756c-4ffd-bd5d-c3432179af28@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/6/26 15:36, Lorenzo Stoakes (ARM) wrote: > On Thu, Aug 06, 2026 at 03:25:50PM +0200, David Hildenbrand (Arm) wrote: >> On 7/28/26 21:47, Gregory Price wrote: >>> mm/mempolicy.c | 4 ++++ >>> @@ -797,6 +799,8 @@ static int queue_folios_hugetlb(pte_t *pte, unsigned long hmask, >>> folio = pfn_folio(pte_pfn(ptep)); >>> if (!queue_folio_required(folio, qp)) >>> goto unlock; >>> + if (folio_is_zone_device(folio)) >>> + goto unlock; >> >> Leave the hugetlb part alone. hugetlb folios will never be ZONE_DEVICE. > > :P > > But dear God we have got to find ways to stop hugetlb being this big stupid > nightmare that every single path of mm has to put an asterix next to itself > about! Yeah, possibly unifying the code (possibly, because it's a mess) but not replicating checks that don't make any sense for hugetlb. -- Cheers, David