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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 91558D46C01 for ; Thu, 29 Jan 2026 00:26:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=TWSSR1Kp+R0G0slMfsVjPkCS8pP/CNtXw5UvMXwZMfc=; b=YkoEdQz6F0DVYkUyuOZjqBe0K1 6Aq7TEsi/UL31U2KOMQYDpiR1ZQ0KdH3l86uLVByx5OlEZGm2dFNPuzBl3Lb2ASt9XninjWgSq1qJ Mfp2fsW5BpxKo5DfVLrh7/IAkB0LFuHKRWEhXW+Rw8aMDNXNDBTixML7bxrUj4KEdrAJ9C2BmsQoI vJ6Sj+lxJDCSZJ/Cde/OBIOrNAU9CAC+WSiHxQ2M0b+ly3PqMNcVZ6fI5s47YweIkAVRrKCtk0hMY ueKN74u3FllBckPkS04YzYGrirhiQUp9fTcIk8Hysvc2lcV1MNesT0QGGx2ZxTiz5OQKw1EZ/Nlfo DAyUUrJg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vlFrf-0000000GyF2-0vrY; Thu, 29 Jan 2026 00:26:27 +0000 Received: from smtprelay0012.hostedemail.com ([216.40.44.12] helo=relay.hostedemail.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vlFrc-0000000GyDn-2rq4 for linux-arm-kernel@lists.infradead.org; Thu, 29 Jan 2026 00:26:26 +0000 Received: from omf14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 80678D458B; Thu, 29 Jan 2026 00:26:22 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf14.hostedemail.com (Postfix) with ESMTPA id EF0B63D; Thu, 29 Jan 2026 00:26:18 +0000 (UTC) Date: Wed, 28 Jan 2026 19:26:28 -0500 From: Steven Rostedt To: Vincent Donnefort Cc: mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v10 03/30] ring-buffer: Introduce ring-buffer remotes Message-ID: <20260128192628.79a34a6c@gandalf.local.home> In-Reply-To: <20260126104419.1649811-4-vdonnefort@google.com> References: <20260126104419.1649811-1-vdonnefort@google.com> <20260126104419.1649811-4-vdonnefort@google.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspamout07 X-Rspamd-Queue-Id: EF0B63D X-Stat-Signature: uhmrud73kdr8woybqusxsioup13m367u X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1+t7iG84us8MSiQ2nrNQ7ZWsO9Oq9yZUDQ= X-HE-Tag: 1769646378-999802 X-HE-Meta: U2FsdGVkX1+bdwF6ot5uPAXO4UKg9m06342APJv10ilLiPixyUI0CFyy6j0Wj/mz6USzSld6iqIYjfII9chDfFeqOCTaZfvxnja7wGjtaTKXp1LbqX3ONComYLSnev9DGtru1uePYI+AhojequSwYIz7AV6hGNoriS7Gnu6FuRaH//dq+BmBRuYoOi47TGOozJNBG2yIPBGOGNCDwicj1dUXKBkyBSykqnKGmF8/x1NxAIhf9xTJmpEBVEH2qlCwGNiLwNqhyO4M8r5WGhLrJC4QuOvv/ueTJZLtWVJkEmyta9R547wZzPtH5+++tMlVfofAs0Tp4KOvhMxutVihpsrx6m5sAqmqs3DE9Ne+lw62cgRW2Pnq+js7nnOuKPdBuZsbiBft49LeZOJC01wZww== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260128_162624_813540_7E48F8BD X-CRM114-Status: GOOD ( 10.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 26 Jan 2026 10:43:52 +0000 Vincent Donnefort wrote: > A ring-buffer remote is an entity outside of the kernel (most likely a > firmware or a hypervisor) capable of writing events in a ring-buffer > following the same format as the tracefs ring-buffer. > > To setup the ring-buffer on the kernel side, a description of the pages > forming the ring-buffer (struct trace_buffer_desc) must be given. > Callbacks (swap_reader_page and reset) must also be provided. > > It is expected from the remote to keep the meta-page updated. > > Signed-off-by: Vincent Donnefort Reviewed-by: Steven Rostedt (Google) -- Steve