From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75A4FC43460 for ; Wed, 14 Apr 2021 20:52:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 566B56117A for ; Wed, 14 Apr 2021 20:52:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238808AbhDNUwg (ORCPT ); Wed, 14 Apr 2021 16:52:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33528 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231319AbhDNUwf (ORCPT ); Wed, 14 Apr 2021 16:52:35 -0400 Received: from mail-yb1-xb2a.google.com (mail-yb1-xb2a.google.com [IPv6:2607:f8b0:4864:20::b2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96AB4C061574 for ; Wed, 14 Apr 2021 13:52:11 -0700 (PDT) Received: by mail-yb1-xb2a.google.com with SMTP id x76so13656640ybe.5 for ; Wed, 14 Apr 2021 13:52:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qMc1dVoRXovpTYQV/nXgGHQYIIUU1MZrniZIcaPAzYI=; b=jZ63PQvS0OSJEWxuC8eQL+mgIeY3zye5GVk1y4o1Jz5FWVvQk/PfIiL7GTYhxNoeq0 rGznM1hJWUQXA6P+waeuHPSY/DJs03JNq0uVwSWPnPsBzxVjgnn6TMUzGdV111v1vp2Q /nX5IfLwP9juprGuNEOuTT07JchH9A7AGMglO6Rb+9+c7hhfVbUxRh2zz0sBnmQacfBf EWnX8k44LFD6bjU3kBqM3T1EuffW2JooY05UpEBA0BKMVo1IB4OZNKKbX1gUPW2isFLB R4bgmou+/6jqYIgPw+6DqLVgue9r1GJfCIJRUL/HusGRiJ45hR+a3JnPDjJrbBlQveOp CdDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=qMc1dVoRXovpTYQV/nXgGHQYIIUU1MZrniZIcaPAzYI=; b=No2uKOFkA1Bs/rkDYKoCSy01oCT/pTn8ffJ3JIKRGE0Fq1rA7fAwsBwQv+yB+SsBhs V927A681888/NulUqVMd0IQnD6YbLDVxfj7yIJv0fwp9hekv9iMWacDAhF86Mn2FLno6 VBM2oIMZCr1jfRngar20652kSv8JVCvq5pX4/dUkVqFwLgLnj3aX8qpizRKJ9F1yvw0h Qb0HoYcan4CJDpfNAFPzdHgWCTawexXbZFF3ZUT94YCI/6oBbA9o7rUf+1Tvu7vrfYDr PAQGMR8ksz4Gq3V1sy4cBRCGNUc683Rc4YbwiK/gqvdkSB8GFGr8vE9FcWRmdKnEY1aK w+RA== X-Gm-Message-State: AOAM531f1sQyoQ/HSDBweCRXpzQDS3mMtXnWOtiMu6EPyUv4SLCYFiH5 ZlIPWgTKLUOEhR57OS0CYwxlLSwBxgIbspiBIwwVTQ== X-Google-Smtp-Source: ABdhPJyqMKv7jKazLHNQr9xfoSHuUWvXv3SH59PCH1Ndn1yE1hoJqvYOK5wZMT0jkn32p4YGeb+4ZAvFlg7cBrY5JE0= X-Received: by 2002:a25:850b:: with SMTP id w11mr55634403ybk.518.1618433530591; Wed, 14 Apr 2021 13:52:10 -0700 (PDT) MIME-Version: 1.0 References: <20210409223801.104657-1-mcroce@linux.microsoft.com> <20210409223801.104657-3-mcroce@linux.microsoft.com> <20210410154824.GZ2531743@casper.infradead.org> <20210414214132.74f721dd@carbon> In-Reply-To: From: Eric Dumazet Date: Wed, 14 Apr 2021 22:51:59 +0200 Message-ID: Subject: Re: [PATCH net-next v3 2/5] mm: add a signature in struct page To: Shakeel Butt Cc: Jesper Dangaard Brouer , Ilias Apalodimas , Matthew Wilcox , Matteo Croce , netdev , Linux MM , Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Guoqing Jiang , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Aleksandr Nogikh , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , LKML , linux-rdma , bpf , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Wed, Apr 14, 2021 at 10:09 PM Shakeel Butt wrote: > > I will let TCP RX zerocopy experts respond to this but from my high > level code inspection, I didn't see page->private usage. Indeed, we do not use page->private, since we do not own the page(s). From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D372CC433ED for ; Wed, 14 Apr 2021 20:52:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6F45D61164 for ; Wed, 14 Apr 2021 20:52:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6F45D61164 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AD6186B006C; Wed, 14 Apr 2021 16:52:12 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A6B666B0070; Wed, 14 Apr 2021 16:52:12 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8B2DE6B0072; Wed, 14 Apr 2021 16:52:12 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0220.hostedemail.com [216.40.44.220]) by kanga.kvack.org (Postfix) with ESMTP id 6B7476B006C for ; Wed, 14 Apr 2021 16:52:12 -0400 (EDT) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 1B6C31830AFF2 for ; Wed, 14 Apr 2021 20:52:12 +0000 (UTC) X-FDA: 78032170104.29.E069641 Received: from mail-yb1-f182.google.com (mail-yb1-f182.google.com [209.85.219.182]) by imf09.hostedemail.com (Postfix) with ESMTP id 5C0F06000113 for ; Wed, 14 Apr 2021 20:52:08 +0000 (UTC) Received: by mail-yb1-f182.google.com with SMTP id o10so23646355ybb.10 for ; Wed, 14 Apr 2021 13:52:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qMc1dVoRXovpTYQV/nXgGHQYIIUU1MZrniZIcaPAzYI=; b=jZ63PQvS0OSJEWxuC8eQL+mgIeY3zye5GVk1y4o1Jz5FWVvQk/PfIiL7GTYhxNoeq0 rGznM1hJWUQXA6P+waeuHPSY/DJs03JNq0uVwSWPnPsBzxVjgnn6TMUzGdV111v1vp2Q /nX5IfLwP9juprGuNEOuTT07JchH9A7AGMglO6Rb+9+c7hhfVbUxRh2zz0sBnmQacfBf EWnX8k44LFD6bjU3kBqM3T1EuffW2JooY05UpEBA0BKMVo1IB4OZNKKbX1gUPW2isFLB R4bgmou+/6jqYIgPw+6DqLVgue9r1GJfCIJRUL/HusGRiJ45hR+a3JnPDjJrbBlQveOp CdDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=qMc1dVoRXovpTYQV/nXgGHQYIIUU1MZrniZIcaPAzYI=; b=er3mllEwUaUXhkvavV+o9y28wGc/9HwV3oYY0niwmuGqIUP2DzOJDhAVrYsEdcHBKu cKUjU0t5BY9qw7tfahfPj0dG/reof76/1NJuc/Ox3paMbz6c3BAdyGttSxBabqCPw+/8 KfH1tccWRfSYUrwuLE+N5+vc69eAec/6wJmqj5OjvDL9ya/de4kqHM0Euwr6a204I3rd oK446S8IxJMFAGXjY1ITrj8465P0ysG6CQpBI5zYtrMv7MMaHjzCVzv0DGgjYFkuMUA1 PGxl8jtFBpF3pFzdvk/YcgPIOtVyGarCVGjJxgvZKZR2GcIKgR1rnF/ZhzM8KY19cguz WswA== X-Gm-Message-State: AOAM531OKFCLLrvfwdzyiN/OU0LIYyM2dtTNp7NKegfDuy3xFV//NyiU yyMj+qkdu0+jyiziCrrqolYkMm08lI5ssXSwwqizmA== X-Google-Smtp-Source: ABdhPJyqMKv7jKazLHNQr9xfoSHuUWvXv3SH59PCH1Ndn1yE1hoJqvYOK5wZMT0jkn32p4YGeb+4ZAvFlg7cBrY5JE0= X-Received: by 2002:a25:850b:: with SMTP id w11mr55634403ybk.518.1618433530591; Wed, 14 Apr 2021 13:52:10 -0700 (PDT) MIME-Version: 1.0 References: <20210409223801.104657-1-mcroce@linux.microsoft.com> <20210409223801.104657-3-mcroce@linux.microsoft.com> <20210410154824.GZ2531743@casper.infradead.org> <20210414214132.74f721dd@carbon> In-Reply-To: From: Eric Dumazet Date: Wed, 14 Apr 2021 22:51:59 +0200 Message-ID: Subject: Re: [PATCH net-next v3 2/5] mm: add a signature in struct page To: Shakeel Butt Cc: Jesper Dangaard Brouer , Ilias Apalodimas , Matthew Wilcox , Matteo Croce , netdev , Linux MM , Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Guoqing Jiang , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Aleksandr Nogikh , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , LKML , linux-rdma , bpf , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 5C0F06000113 X-Stat-Signature: sou461y99irti4449phbi8wirfjkmr7y X-Rspamd-Server: rspam02 Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=mail-yb1-f182.google.com; client-ip=209.85.219.182 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618433528-898194 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Apr 14, 2021 at 10:09 PM Shakeel Butt wrote: > > I will let TCP RX zerocopy experts respond to this but from my high > level code inspection, I didn't see page->private usage. Indeed, we do not use page->private, since we do not own the page(s).