From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 7BCFA31C583 for ; Mon, 8 Sep 2025 18:50:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757357408; cv=none; b=F38FMQMwUWCGjlngU2Qg+LPEfKmopSo5EH/HZMKjZUD8R54vrGx77sDc2t7sldYfCxc5/OoYSAgID8ARr24eXkubg7XihcDPcKCWRh+B9qVpX+pcvfPQR7CA/SIbdeB3iqpkEOwUbCQs/fDVmdk1+efc95CTQc/2qAqr47MnWKw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757357408; c=relaxed/simple; bh=E7Vj9/23AE8WzpJfHTcwBG4Ng9PhfJNp1DnthXzdKgQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=C1igxbXrpbzFLhNjnhuniTqaFd7Mg6flF2e8TaFJV+yPAs1qENjPDknVb+pRWSomxGFMOHPHvHGoJLyh6VUFQ53M+gZ9IJtF6YlYq/2ilZCc+XPm/dFeGK6Q9Xk8mxeN5io5ZstQyFx5OLLhAUKBWm2vNKxxzkUdGRxPoLuLl3g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=aCqx3VLP; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="aCqx3VLP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1757357406; 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:autocrypt:autocrypt; bh=UUZtrw9Ce3OTyc4thmlH4DQBN7q3kEq/o1AqpiGl1UQ=; b=aCqx3VLPM0i+ERJizvv6zGlhR3L1Xhz4WLqT2w21dSi9vKx4im8zwuG1EeeGfOIs+uzbXe ysACZYSESLEKvuhIzS9YRM05CEoCN8i7hdAyZoOvn9eEU7znpy4pIeuvq4ZGFd9JqGfMb7 DJSScW0JWAV9c/ekWRv8XHd436ic42M= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-333-ov2EYZj1PRODArYfEW_HTA-1; Mon, 08 Sep 2025 14:50:05 -0400 X-MC-Unique: ov2EYZj1PRODArYfEW_HTA-1 X-Mimecast-MFC-AGG-ID: ov2EYZj1PRODArYfEW_HTA_1757357404 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-45de27bf706so8076295e9.0 for ; Mon, 08 Sep 2025 11:50:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757357404; x=1757962204; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=UUZtrw9Ce3OTyc4thmlH4DQBN7q3kEq/o1AqpiGl1UQ=; b=ArTwPip5pz0at/B9+v0Yd0elsPt85Fx6qwvfCn8Pfwbjla4QRAvvGPZFl1VcjXGwrA dhy0c95c2A8tGMtRES/pwPEj3HMOgalrsU6jUQA5doQuyKzt/tM1T+TeDoZapdOPsLNc 1vd1EIXMKvLJXImIYWKmbdfm9tX//RFOiNnD5hik7/4pZLHV6WCSoggHPri6el3FrJAv qh1ZeTV3zfOz5yWb4doPuHfJmTczNUN3jNzQBdu9xcdP38mBJ7s3V1BjZsQlP+GJ6oro 7lhQdZ1C0PWkA45zOg6pPxyj15e40CimOlKWLiYlLS92V2/a3aN+g8c/ghpNLURsHcYq 4ClA== X-Forwarded-Encrypted: i=1; AJvYcCVeqfHGoyBAKtY3wGWssj7BUr5cAVEXd1YTmDrL/ER8fleckPF8s1gyQPgdtfJvxVQUhI3Hc1T6zlI=@vger.kernel.org X-Gm-Message-State: AOJu0YzXqzRVsqVQnfqtJFT4bDVnm+6LybJR+2ZZBpLerYZRSc8h7O0C W8LrZeC7hwQJm0vCsmJL/9moJxC/AgTf3n1YYTyeD8wc9iuE5R/JFLl3CQS1v7LTE6atEVWfvLG ZThOBHrM3vVOhEzVllM1ClbhFMO9eWUJujVnrzXmxH1WMyG86OiDW4HMkViWMrQ== X-Gm-Gg: ASbGnctTBu4jjl7JlAfMTLQciEF7pDF+8aTEhJUYCM+sS4q/5429bMDF2KHvEN2H3Ei 0F9Gg/OKgzStl8lMQS1ouV5IOHpP1a5OnI3U6vmboTyA6mR48ZI+9FEqZ23g1M3wrG1mikIxAbi 1Kwex5YIHVi6GKvYvFv2cQD7yNTC72lt3+CnRluWC6k9+zeW5bwDd+eQ2WZzJvVdNWC1vwVhQWg 9ajMsvlwJqNneImgFkrbu6VU35bwzYwr024ZQalh6qxfFqnAKeNnYuNka0laYigl2vsXZ/Xx2TE 8XnZQL1iXOlF3u7hGWQxzjZ5cukr92b5CToy7tgG1wnRMslI4eDz6Y2wTTvLgBoQHLwp6ngax+J elY1Kv1V4qMTcWfOL/Gbz+Um7rjK5HefdsQZiS8Ocdalbhm3Z7xCKAruG00NhjbCU X-Received: by 2002:a05:600c:3b8b:b0:45d:d356:c358 with SMTP id 5b1f17b1804b1-45dddec3b92mr97992935e9.16.1757357403763; Mon, 08 Sep 2025 11:50:03 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEGm/PFvNVvzQhpYmtJ6sQ83PhVXMHxysLrDdewgd4nQchvdGU1VvxC8ioJR+t94JeN3eCthg== X-Received: by 2002:a05:600c:3b8b:b0:45d:d356:c358 with SMTP id 5b1f17b1804b1-45dddec3b92mr97992345e9.16.1757357403298; Mon, 08 Sep 2025 11:50:03 -0700 (PDT) Received: from ?IPV6:2003:d8:2f25:700:d846:15f3:6ca0:8029? (p200300d82f250700d84615f36ca08029.dip0.t-ipconnect.de. [2003:d8:2f25:700:d846:15f3:6ca0:8029]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3d92d51982bsm27196227f8f.21.2025.09.08.11.50.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 11:50:02 -0700 (PDT) Message-ID: Date: Mon, 8 Sep 2025 20:50:00 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 22/22] mm/mshare: charge fault handling allocations to the mshare owner To: Anthony Yznaga , linux-mm@kvack.org Cc: akpm@linux-foundation.org, andreyknvl@gmail.com, arnd@arndb.de, bp@alien8.de, brauner@kernel.org, bsegall@google.com, corbet@lwn.net, dave.hansen@linux.intel.com, dietmar.eggemann@arm.com, ebiederm@xmission.com, hpa@zytor.com, jakub.wartak@mailbox.org, jannh@google.com, juri.lelli@redhat.com, khalid@kernel.org, liam.howlett@oracle.com, linyongting@bytedance.com, lorenzo.stoakes@oracle.com, luto@kernel.org, markhemm@googlemail.com, maz@kernel.org, mhiramat@kernel.org, mgorman@suse.de, mhocko@suse.com, mingo@redhat.com, muchun.song@linux.dev, neilb@suse.de, osalvador@suse.de, pcc@google.com, peterz@infradead.org, pfalcato@suse.de, rostedt@goodmis.org, rppt@kernel.org, shakeel.butt@linux.dev, surenb@google.com, tglx@linutronix.de, vasily.averin@linux.dev, vbabka@suse.cz, vincent.guittot@linaro.org, viro@zeniv.linux.org.uk, vschneid@redhat.com, willy@infradead.org, x86@kernel.org, xhao@linux.alibaba.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org References: <20250820010415.699353-1-anthony.yznaga@oracle.com> <20250820010415.699353-23-anthony.yznaga@oracle.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20250820010415.699353-23-anthony.yznaga@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 20.08.25 03:04, Anthony Yznaga wrote: > When handling a fault in an mshare range, redirect charges for page > tables and other allocations to the mshare owner rather than the > current task. > That looks rather weird. I would have thought there would be an easy way to query the mshare owner for a given mshare mapping, and if the current MM corresponds to that owner you know that you are running in the owner context. Of course, we could have a helper like is_mshare_owner(mapping, current) or sth like that. -- Cheers David / dhildenb