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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A3BFC28B2E for ; Wed, 12 Mar 2025 18:49:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6A4B3280002; Wed, 12 Mar 2025 14:49:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 65407280001; Wed, 12 Mar 2025 14:49:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 56A6D280002; Wed, 12 Mar 2025 14:49:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 383ED280001 for ; Wed, 12 Mar 2025 14:49:00 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id A73231215A6 for ; Wed, 12 Mar 2025 18:49:01 +0000 (UTC) X-FDA: 83213786082.12.86FB823 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf01.hostedemail.com (Postfix) with ESMTP id 1083E40007 for ; Wed, 12 Mar 2025 18:48:59 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=mLGZyDDg; spf=pass (imf01.hostedemail.com: domain of shuah@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=shuah@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1741805340; h=from:from:sender: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:dkim-signature; bh=+seXrfAUUoI9vsCowqUzjJyJ+seNEQoIBmwPeYW+5eA=; b=tTBpPsdq8zPKcO6t1qJPSjf7QBnV2kIbR4Xr6WkyREVWveHVf1PU74j7WfrEnvEp+/154H 9U2ijnbfZNq8t/PSye5feUZRtukbwKHI7yX/I7nwmAMixC+Bni6P38SXaNpMOfV3KX/gEM gOJdDBcSQUmdz4mCux6mSnHC4IDnxw8= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1741805340; a=rsa-sha256; cv=none; b=RqQrDKvKd68YafsO+nBRehU6Ie//JqFB3YGklLCt5xxkWSgbFoNS3mRyPMc7/HhJ+0tYlt p1dKc8ehWcSjLH0q3l77SeBpq/p5VgFeX1VvLhy0Qo1JuWX7OjrJeZj/scGqa5IKZnGi7h QUhlrnmw+g3BOsMpN3JWDPFKWzp/18I= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=mLGZyDDg; spf=pass (imf01.hostedemail.com: domain of shuah@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=shuah@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id CF7B0A471A2; Wed, 12 Mar 2025 18:43:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1921C4CEDD; Wed, 12 Mar 2025 18:48:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741805337; bh=RYzjK8wVIc1HHnVu/GI9bATbp6+dbWOnCJI9x5MtnUM=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=mLGZyDDgZM7UM9oi3ELeAirX/CI0elGGrYRMJPMWiei+vrfF70uBQWvSIfOH4i48k R2W4um1fh7SRhH/UY3bbBsMe7tn43a5+UaBY3vR881M+MCzX0/b7JOrqhqSH5dTBw2 RSL/63NjbVDGqhvpV+ydqR+5NxsQJN/mdbCqbj82wF5KS0o9jtGw6ZJviEePdzYlPH /MAUFBi8BeqeXgg4Yhhr/lM5BJBjz7dPraKwBmBbr6Rn0usdckucKfBYGPCzqmf+HK aZ5XHeIFptoeMKijgD/FkQA7KyD6WlAjJgChqZlkdGDHPOh3B1sspD+zuSRrBDfTIP 7NAxZAGy2GshQ== Message-ID: Date: Wed, 12 Mar 2025 12:48:56 -0600 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH net-next] page_pool: Track DMA-mapped pages and unmap them when destroying the pool From: shuah To: Yunsheng Lin , Matthew Wilcox Cc: =?UTF-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Yunsheng Lin , Andrew Morton , Jesper Dangaard Brouer , Ilias Apalodimas , "David S. Miller" , Yonglong Liu , Mina Almasry , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-mm@kvack.org, netdev@vger.kernel.org, conduct@kernel.org References: <20250308145500.14046-1-toke@redhat.com> <87cyepxn7n.fsf@toke.dk> <8fa8f430-5740-42e8-b720-618811fabb22@huawei.com> <52f4e8b1-527a-42fb-9297-2689ba7c7516@kernel.org> Content-Language: en-US In-Reply-To: <52f4e8b1-527a-42fb-9297-2689ba7c7516@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 1083E40007 X-Stat-Signature: knp7ynwbdg9w1dscofdx5bbz15frme65 X-HE-Tag: 1741805339-137453 X-HE-Meta: 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 2GPf51xs n7KHi3RJ3WocF2FA= 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: List-Subscribe: List-Unsubscribe: On 3/12/25 12:35, Shuah wrote: > On 3/12/25 06:05, Yunsheng Lin wrote: >> On 2025/3/11 23:11, Matthew Wilcox wrote: >>> On Tue, Mar 11, 2025 at 08:25:25PM +0800, Yunsheng Lin wrote: >>>>> struct page { >>>>>     unsigned long flags; >>>>>     unsigned long memdesc; >>>> >>>> It seems there may be memory behind the above 'memdesc' with different size >>>> and layout for different subsystem? >>> >>> Yes. >>> >>>> I am not sure if I understand the case of the same page might be handle in >>>> two subsystems concurrently or a page is allocated in one subsystem and >>>> then passed to be handled in other subsystem, for examlpe: >>>> page_pool owned page is mmap'ed into user space through tcp zero copy, >>>> see tcp_zerocopy_vm_insert_batch(), it seems the same page is handled in >>>> both networking/page_pool and vm subsystem? >>> >>> It's not that arbitrary.  I mean, you could read all the documentation >>> I've written about this concept, listen to the talks I've given. > > You can't point to talk given on the concept - people don't have to go > find your talks to understand the concept. You are expected to answer > the question and explain it to us here in this thread. > > But >>> sure, you're a special fucking snowflake and deserve your own unique >>> explanation. Mathew, This message is a rude personal attack. This isn't the way to treat your peers in the community. Apology is warranted. > > Yunsheng Lin, This message is a rude personal attack. This isn't the > way to treat your peers in the community. Apology is warranted. > Yunsheng Lin, I am so sorry I got it wrong. Apologies for the mistake. thanks, -- Shuah (on behalf of the CoC committee)