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 C0A013E7BA4 for ; Mon, 6 Jul 2026 09:04:05 +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=1783328648; cv=none; b=bMwS1KnvwKCAcduMI+kFqGiD3BIqTLF6QvjFeayLjjaESDAAZJ0bh5zoc8uY95Bjn8CaUvEHTBi9dGjB/SBBUo9/YI/WwoEbmi3/1xZW5RnaH6mjLTKNm+PthhdMxjvfg8UR1h+jj0KvvH+9bwvlSSGiolNSu9c1d82pg9hJm+g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783328648; c=relaxed/simple; bh=viN1u8bS+3py0iKkSvAlD5x7S5/jDfqmLH/XfKqTSvQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=GlxAmsd+v6bQzWB9r6/5sKl9GJpyQwNF5j4Ie4QeHXp5VvVEv7oe4IFyM/vnXj1/0W+onSS8hElBBUEGHwWpEYC+giiFNeDuDJe+AWGROS3JmpGpChtI4EqV3V2B1SYrpjm/eSmL7yt4dARADhfGgPtnQwzYA9xhtmO52g18yDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GETY1i49; 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="GETY1i49" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 782CA1F000E9; Mon, 6 Jul 2026 09:03:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783328641; bh=5OarufiuowxPUUgdW+NmJtZnc440F7WatBguGIfARR0=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=GETY1i49QXGftXhugiIMCearNR9AkhC56iuKwK0t5K2wOH3wfrhyFWukEzF/EnV4t v8UT44jzjaY4v4xI8UYNOW1K2G4EKo7CR6+mEftyizJ3l0iQ2Cak5HbLGOar5xxUTG 8FTeHUWpquu6ToYIt89/Dx8HEsB/P/fgsRBrM25LrTmP1m1aZFu9NA0W0zSKmTpiic lIC87+DfZSD1R7fpcSOCUs/iUAkKP2eFUH1/PNU1gloVziFDiz9Xn5NO2wjXJPXAtN 3KHR1PIp6A/gpDJmy0ZyOiyEwMqeRCnhZvAmPJa3IP0UIJJNNmtXdbbWFlkxWAq0ix xnA8LlPPXtjRA== Message-ID: <2c619662-0e6a-470e-8698-b74afea758f3@kernel.org> Date: Mon, 6 Jul 2026 11:03:51 +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 v6 0/5] Only free healthy pages in high-order has_hwpoisoned folio To: Andrew Morton , Jiaqi Yan Cc: linmiaohe@huawei.com, ljs@kernel.org, ziy@nvidia.com, vbabka@kernel.org, osalvador@kernel.org, harry.yoo@oracle.com, willy@infradead.org, osalvador@suse.de, jackmanb@google.com, hannes@cmpxchg.org, nao.horiguchi@gmail.com, william.roche@oracle.com, tony.luck@intel.com, wangkefeng.wang@huawei.com, jane.chu@oracle.com, muchun.song@linux.dev, liam@infradead.org, rientjes@google.com, duenwen@google.com, jthoughton@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, vbabka@suse.cz, rppt@kernel.org, shuah@kernel.org, surenb@google.com, mhocko@suse.com, boudewijn@delta-utec.com References: <20260705180714.3708947-1-jiaqiyan@google.com> <20260705115045.eba41efda0c46121b1d10827@linux-foundation.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 7/5/26 20:50, Andrew Morton wrote: > On Sun, 5 Jul 2026 18:07:09 +0000 Jiaqi Yan wrote: > >> At the end of dissolve_free_hugetlb_folio(), a free HugeTLB >> folio becomes non-HugeTLB and is released to buddy allocator >> as a high-order folio, e.g. a folio that contains 262144 pages >> if the folio was a 1G HugeTLB hugepage. >> >> ... >> >> Introduce free_has_hwpoisoned() to only free the healthy pages >> and exclude the HWPoison ones in the high-order folio. >> free_has_hwpoisoned() happens at the end of free_pages_prepare(), >> which already deals with both decomposing the original compound >> page, updating page metadata like alloc tag and page owner. >> It is also only applied when PG_has_hwpoisoned indicates folio >> contains certain HWPoison page(s) for performance reason. >> Its idea is to iterate through the sub-pages of the folio to >> identify contiguous ranges of healthy pages. Instead of freeing >> pages one by one, free_has_hwpoisoned() then re-use >> free_prepared_contig_range() [11] to decompose healthy ranges into >> the largest possible chunks of different orders. Every chunk is >> freed via __free_frozen_pages(). > > Thanks. I'll await further reviewer input before taking any action > with this series. FWIW, I want Vlastimil to ack this before this goes upstream. -- Cheers, David