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 516A34E66A3 for ; Mon, 7 Sep 2026 13:46:40 +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=1788788804; cv=none; b=BQhtkmMZPEIULeZczfFmyIVquTf61mtcmb42GVJwABZVHD61dBmCuXoXLZrVlNKeLjhdhf8wpps6N3A9TGiDDK+lRVKA0Ne1mLovAZvRNrWcqSfj9VzfKBLbnJDhitl9LSpZlZR2r8r7+MLaHG6j8yuYCxNhsLGEqbJJFTXTt7Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788788804; c=relaxed/simple; bh=56UF0jK1Ic53xnLhcdW6S8HA3DiVODpp5zWP6ohOoxc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WgElm2+v0ugRdmCvp9y7zgNQT5cWS9pGw0JLEtVLHni7isrvA3XbW0AJy244YyXwigNkn9vuN/kvI8p5iIfX9fwJflLpNCDT2OS4rR1mtbv/c/Ed6bucj54vH0orQxmr1cjCLRi9a6z5WJgULsBGrM/mG78bgfbLN9hp1i18zNE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UGRPqI68; 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="UGRPqI68" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 923ED1F00A3A; Mon, 7 Sep 2026 13:46:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788788799; bh=wzDzxAuqB9ojF+hh+Hj8j9w5WVxfT4T0AT5rizOV1hI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=UGRPqI68GBAlh9C4rRQOOuXVdq/mzmQAz/kOW0z5WgWrOMrsS3ws5BWD637XsEwVb IwxYeDnfu8B/WLcDl+8qaC0Xh02fxQg4WFWtBXFjmSlz0Lhr8bUbsIECP40NS/YdRD EOv9yD6mYbsWGGM1lRftr46ALQcMecwn5EvLpwPq9IWY9TPXCRyv+cLZoPTjKs8uKG c9bUyKAmT0JlaBuwEYlgnvTFGMiCE+wQtzyYAsHbl99TI1l93lajRjG8o2nYl0y2ac EPcwHiuAU9nk+9TnO8GclwjCWfO5l5ax7BH7Krk4KDQSvOrcnKqKQfjc8PEceGdqBt yceWjUTYotkWA== Message-ID: <5a04238e-7dc7-4c88-b0be-c4b510488f48@kernel.org> Date: Mon, 7 Sep 2026 15:46:30 +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: Linux MM Alignment Session on hwpoison To: David Rientjes , "Vlastimil Babka (SUSE)" Cc: William Roche , Jiaqi Yan , linmiaohe@huawei.com, ljs@kernel.org, ziy@nvidia.com, osalvador@kernel.org, harry.yoo@oracle.com, willy@infradead.org, osalvador@suse.de, jackmanb@google.com, hannes@cmpxchg.org, nao.horiguchi@gmail.com, tony.luck@intel.com, wangkefeng.wang@huawei.com, jane.chu@oracle.com, akpm@linux-foundation.org, muchun.song@linux.dev, liam@infradead.org, duenwen@google.com, jthoughton@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rppt@kernel.org, shuah@kernel.org, surenb@google.com, mhocko@suse.com, boudewijn@delta-utec.com References: <20260705180714.3708947-1-jiaqiyan@google.com> <85cb7ea8-8116-4092-8310-69b61eb8602c@kernel.org> <1dea7b3c-7740-474d-b9d4-cd2baf47f181@kernel.org> <168ad406-f6b5-4623-adac-9f894e410e48@kernel.org> <8f787434-5326-4a8f-92d0-467e817a23b4@kernel.org> <8f023b9f-53d0-0eb8-6f75-65957761cf40@google.com> 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 8/29/26 01:36, David Rientjes wrote: > Following up on this thread and the suggestion from Matthew (thank you!), > I think it would be useful to have a hwpoison requirements and roadmap > discussion on how its support is currently integrated into the core MM, > get an understanding of what the areas to improve are, and get a sense of > future work in this area that people are planning. > > This particular patch series is addressing an area of interest to Google, > but it's also quite clear from the thread that there are multiple areas to > improve for hwpoison in the core MM and it wouldn't hurt to get more > insight into what dependencies users have on it. > > I'd propose this for discussion in one of our upcoming Linux MM Alignment > Sessions: Wednesday, September 16 9-10am PDT (UTC-7). > > No specific agenda other than to gather core MM developers with hwpoison > developers and discuss: > - where validation should live, esp with regard to the page allocator, or > strict invariants in the page allocator > + implications for the fastpath > - handling for folios of arbitary orders > - handling partial folio poisoning and split failures > - race conditions between memory_failure() and concurrent > alloc/free/compaction > - soft offline for pages in the pcp lists There is also the hugetlb hwpoison oddity. -- Cheers, David