From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-186.mta1.migadu.com (out-186.mta1.migadu.com [95.215.58.186]) (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 9C4DC1D7E41 for ; Sat, 13 Jun 2026 19:35:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.186 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781379307; cv=none; b=UHdz3DTV20XgCkGAZRQfyKhnuTJrkoytZ0MZARvqpYONNpC2wUx1ns1r6IAGXNOHOQafGqIJZvn7f/4GApq7FvAXbnCfk1QlL5S0aJN6HeikRYS6JX7uhWXrw3FjeDi4/ZeisE2SYvJZSska4L2drFU3i8sCNt7pScXZ5zDuUrM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781379307; c=relaxed/simple; bh=YZbcDZ12moY3A94Ubi3SKimiPxzY7onrSWlEGGaHrxA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=XTAYyvMgBJBmHrPUi1s/Nn3+lSMitSxhb4sDqsb76es6eUabvKcktYHzNA+3Th6SzusGK8qPm9cHVhiJjjRZk0EcWzzbGYn8j6/oXQjkZTmMdtR8dXRS3QZvnyRYG5/TI3cG0x/zfC7uH69LGgo4J8NK5dyMA3wNtZe5F83kI7k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=HNoEjJb7; arc=none smtp.client-ip=95.215.58.186 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) header.d=linux.dev header.i=@linux.dev header.b="HNoEjJb7" Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1781379303; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NtZ58HMyb2KWleS4KaZ+M8+Hcfntu8GbwUU5x+HyEbI=; b=HNoEjJb79tKVpnf/gfxxUOlyv1qOtaVi8rKP6rcqCVxgA+dih6PGZDXtimzaRUc1BhkdMQ cUOmq9BxRA1czVg5oKbD3Ptzc3+kRm4dpoaEr4o5PumNO0WdMpixO3XjxWixxPelUPm0BA eEMhBFKEnwbouSVkJZ1v7SVoD5PQg3g= Date: Sat, 13 Jun 2026 20:34:45 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [v2 00/16] mm: PMD-level swap entries for anonymous THPs To: Zi Yan Cc: Andrew Morton , david@kernel.org, chrisl@kernel.org, kasong@tencent.com, ljs@kernel.org, Linux Memory Management List , ying.huang@linux.alibaba.com, Baoquan He , willy@infradead.org, youngjun.park@lge.com, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, alex@ghiti.fr, kas@kernel.org, baohua@kernel.org, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, "Liam R. Howlett" , ryan.roberts@arm.com, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, kernel-team@meta.com References: <20260602142537.198755-1-usama.arif@linux.dev> <6E99CC4E-A026-4DE3-8A5A-34216771F521@nvidia.com> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Usama Arif In-Reply-To: <6E99CC4E-A026-4DE3-8A5A-34216771F521@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 13/06/2026 20:27, Zi Yan wrote: > On 9 Jun 2026, at 10:29, Usama Arif wrote: > >> On 02/06/2026 15:24, Usama Arif wrote: >>> When reclaim swaps out a PMD-mapped anonymous THP today, the PMD is >>> split into 512 PTE-level swap entries via TTU_SPLIT_HUGE_PMD before >>> unmap. >>> >>> This series introduces a PMD-level swap entry. The huge mapping is >>> preserved across the swap round-trip, and do_huge_pmd_swap_page() >>> resolves the entire 2 MB region in a single fault on swap-in, >>> no khugepaged involvement is needed. swap_map metadata is identical >>> either way (512 single-slot counts), so the PTE split buys nothing >>> on the swap side, it is purely a page-table representation change. >>> >> >> Hello! >> >> Just following up if there were any reviews/comments on this series! >> >> I know its a large series but was just checking if there was any >> feedback? > > Maybe send first 6 clean-up patches separately to get them merged first? Good idea! Will do that. Thanks! > > -- > Best Regards, > Yan, Zi