From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f52.google.com (mail-ej1-f52.google.com [209.85.218.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C726383BF for ; Sat, 27 Apr 2024 02:11:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714183885; cv=none; b=MPZONz0iuZn0RQUi6L0zMbG7ebDDxPa9Q6gAK4tGVmMKqwOwH6ujH/CLe/XBytQnPRNV7lQ2drdhUpebFzfQjxrVamrGIfLe6lviZbBADncPTmMSjVwiWDY5SpWwpLQC0TJJ9ybn42Zy3508X4th2J37EceNWxbPkfNgnlw6vFE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714183885; c=relaxed/simple; bh=3TH1qKN/8kDOE9KfhYRZV82BLgZZskB3YkO2+4vu+tY=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=dvpFEJh17V7Yqn7wJu2//AI8SS7c/ln1Ao7yoeF69QTSnOkA2DSf/ihFguedLEAWbqJb8wcOH9YBXg+R3HxE7QaWW1YrfP2mHW+3o6fZzn3l8XwMjj+e9Ofh9Ei/imxbR02XFlqWY7rBSmILMKFn8pWqBs+due2K/cj/IV//tFs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=mRu4S3Xu; arc=none smtp.client-ip=209.85.218.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="mRu4S3Xu" Received: by mail-ej1-f52.google.com with SMTP id a640c23a62f3a-a58e2740cd7so59043366b.1 for ; Fri, 26 Apr 2024 19:11:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1714183880; x=1714788680; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=VCqXmA+0tJPmuPol3Ypy0jPmfZ3hkXnnk0DE4uLAUwU=; b=mRu4S3XuUIqgZ4Zuu0XgismEQ5/XUBilPfFw+Xm1y6jIuBkNYDGqtJpVPfr3+pUbZf sAyOLb5LdfBvQbmhLVih+PhEODGod32DbRItT4xo6P4xZydC8tce2YXd8+WGUheKnvMl 0gsDcMKy6EBMpWyVbsMo1ZYgFLSjchUULUluFbRjoQMZtHnCgGtdyMdP/eTFH75BbT8K FVX5+bOMpdzkiS5xZzDrCWaSldC5RZPNVAUarByQRaAUL3UsGpPK9BwIUf856PWynKMz yJGJKrx4/S1+RH9spj8VX4cHz3UyMAPh/HkI2nBx0BpnQc3OmMiXbW/kS0kmdQqOktCD Fhzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714183880; x=1714788680; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=VCqXmA+0tJPmuPol3Ypy0jPmfZ3hkXnnk0DE4uLAUwU=; b=wPox0v9UwteHzYSaUVXyp/vGtOOttA0usns70BEUdPmJlwjMX0GFcnmXAW6fJF5jjn MVSi0yw5aU5/bSY7XH1eB/5qgkdYrWOJsa05bcDhsft+uUyJogbsXa3tFoMLfnJsuake q0X9iOvhN7hQjZWm0zTAyIhN+W9y4fwhInFgEzM72NRCdv1cpkdpUgHw+2/iV82pbCdl EpY4q49WY0iBtecEbQ/fZekLWKr+wh5b+T6vQFfBPGTjmyb4OH47+jnrblseIpp1T9pM quUmsd9Ug2YtpQYJLw3Ir9TLkWYrvf1u+E25kOJ4SezUSuWiTWmFh79yGcb7fG7sCMw3 q5tg== X-Forwarded-Encrypted: i=1; AJvYcCXr+uYmUpf42MrY5Mn5qkXVxE1dw2yWq1RLj17jixf59y44aIuRZI2Wt+ZLCagMGCaTOZpnm/EqdCEY6AAASsCjveSKvv9adbnJsA== X-Gm-Message-State: AOJu0YyeD2pdJhoeAzq2KQ4qSjtYHmnSM2u+kDuhl8DDD2892A2MRJxe L3RjcYMLwyDvcLN0pc4XfhH2EJB/hG67WijPr8bjQ3qJ/z4ofOvZuWDXhqRdPJZl3zDvZH3f1NC 1fLgS1BxTOe7UcS4adhUQ460hmXQRPUoR8bpM X-Google-Smtp-Source: AGHT+IGYpMq0S7NMYmgbheltdqICqswpFYbRt1nWr9f34ViEhM+DD9iOxk080j42Jd8vuPQgs8NIkJRSPoJ58AydrBw= X-Received: by 2002:a17:907:a49:b0:a58:c550:a102 with SMTP id be9-20020a1709070a4900b00a58c550a102mr4510853ejc.29.1714183880204; Fri, 26 Apr 2024 19:11:20 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240403002053.2376017-1-almasrymina@google.com> <20240403002053.2376017-8-almasrymina@google.com> <8357256a-f0e9-4640-8fec-23341fc607db@davidwei.uk> In-Reply-To: <8357256a-f0e9-4640-8fec-23341fc607db@davidwei.uk> From: Mina Almasry Date: Fri, 26 Apr 2024 19:11:07 -0700 Message-ID: Subject: Re: [RFC PATCH net-next v8 07/14] page_pool: devmem support To: David Wei Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Amritha Nambiar , Maciej Fijalkowski , Alexander Mikhalitsyn , Kaiyuan Zhang , Christian Brauner , Simon Horman , David Howells , Florian Westphal , Yunsheng Lin , Kuniyuki Iwashima , Jens Axboe , Arseniy Krasnov , Aleksander Lobakin , Michael Lass , Jiri Pirko , Sebastian Andrzej Siewior , Lorenzo Bianconi , Richard Gobert , Sridhar Samudrala , Xuan Zhuo , Johannes Berg , Abel Wu , Breno Leitao , Pavel Begunkov , Jason Gunthorpe , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi , linux-mm@kvack.org, Matthew Wilcox Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Apr 26, 2024 at 5:18=E2=80=AFPM David Wei wrote: > > On 2024-04-02 5:20 pm, Mina Almasry wrote: > > @@ -69,20 +106,26 @@ net_iov_binding(const struct net_iov *niov) > > */ > > typedef unsigned long __bitwise netmem_ref; > > > > +static inline bool netmem_is_net_iov(const netmem_ref netmem) > > +{ > > +#if defined(CONFIG_PAGE_POOL) && defined(CONFIG_DMA_SHARED_BUFFER) > > I am guessing you added this to try and speed up the fast path? It's > overly restrictive for us since we do not need dmabuf necessarily. I > spent a bit too much time wondering why things aren't working only to > find this :( My apologies, I'll try to put the changelog somewhere prominent, or notify you when I do something that I think breaks you. Yes, this is a by-product of a discussion with regards to the page_pool benchmark regressions due to adding devmem. There is some background on why this was added and the impact on the bench_page_pool_simple tests in the cover letter. For you, I imagine you want to change this to something like: #if defined(CONFIG_PAGE_POOL) #if defined(CONFIG_DMA_SHARED_BUFFER) || defined(CONFIG_IOURING) or something like that, right? Not sure if this is something I should do here or if something more appropriate to be in the patches you apply on top. I additionally think you may also need to run the page_pool_benchmark_simple tests like I do in the cover letter to see if you're affecting those. -- Thanks, Mina