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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4121AC43217 for ; Tue, 29 Mar 2022 15:21:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238447AbiC2PX3 (ORCPT ); Tue, 29 Mar 2022 11:23:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232090AbiC2PX3 (ORCPT ); Tue, 29 Mar 2022 11:23:29 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48CA37CB02; Tue, 29 Mar 2022 08:21:45 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 4FBEE1FD0A; Tue, 29 Mar 2022 15:21:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1648567304; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=n/czKHIPapnBxpdu79ODwmVGjcsUIWEmGzncRJ5TN4Q=; b=lbxalIk0hgBTc9ZrvdtVK14x3u1oqMDVbsoiIWRU/HZAKUtFdn9xuq+x4VdQSqRv2NIzra 6u7dg24T8Ka4DRgQdxJkMClNHbD8rd8VMmEUcF8AeBfKYtvlHup2tBTYs1n4gYuW4kxpnl lnJuwJXKKePEEilmmgnC19er+O83O34= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 755B913AB1; Tue, 29 Mar 2022 15:21:43 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id hsZZGwckQ2LkcwAAMHmgww (envelope-from ); Tue, 29 Mar 2022 15:21:43 +0000 Date: Tue, 29 Mar 2022 17:21:42 +0200 From: Michal =?iso-8859-1?Q?Koutn=FD?= To: "T.J. Mercier" Cc: David Airlie , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jonathan Corbet , Greg Kroah-Hartman , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Todd Kjos , Martijn Coenen , Joel Fernandes , Christian Brauner , Hridya Valsaraju , Suren Baghdasaryan , Sumit Semwal , Christian =?iso-8859-1?Q?K=F6nig?= , Benjamin Gaignard , Liam Mark , Laura Abbott , Brian Starkey , John Stultz , Tejun Heo , Zefan Li , Johannes Weiner , Shuah Khan , kaleshsingh@google.com, Kenny.Ho@amd.com, skhan@linuxfoundation.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [RFC v4 5/8] dmabuf: Add gpu cgroup charge transfer function Message-ID: <20220329152142.GA15794@blackbody.suse.cz> References: <20220328035951.1817417-1-tjmercier@google.com> <20220328035951.1817417-6-tjmercier@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220328035951.1817417-6-tjmercier@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hi. On Mon, Mar 28, 2022 at 03:59:44AM +0000, "T.J. Mercier" wrote: > From: Hridya Valsaraju > > The dma_buf_charge_transfer function provides a way for processes to (s/dma_bug_charge_transfer/dma_bug_transfer_charge/) > transfer charge of a buffer to a different process. This is essential > for the cases where a central allocator process does allocations for > various subsystems, hands over the fd to the client who requested the > memory and drops all references to the allocated memory. I understood from [1] some buffers are backed by regular RAM. How are these charges going to be transferred (if so)? Thanks, Michal [1] https://lore.kernel.org/r/CABdmKX2NSAKMC6rReMYfo2SSVNxEXcS466hk3qF6YFt-j-+_NQ@mail.gmail.com