From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 323CC233149; Thu, 29 Jan 2026 00:26:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769646403; cv=none; b=X3LY0rRnpzZExbcyKIWAXWlR/hcCMES5wOW8aGg+8seO296QjJh8yq47x2qaZIRA5NQ9UMjGX4+UWjzh3q/qTMifYPZSzqstq9eJ7cZQ67oMTsr+gC4Kqi5L0X4RjCMsIqFj6B+zXlSmCU+xjFBjH+jIN/dEGoQH0ZBK8NqAkNc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769646403; c=relaxed/simple; bh=tjGmC4vdq68Ucromqv5FIbCkm+7Tf3YJTwA2beefXD0=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Ll1IO8VMQYJE3tPyw/jLCEuK/HBchTtsHv8a5XjnAdoqq8bimGO+qimK7rHthOmrni+Qi1fiGdnGUxybTfqWObbEiqA26AHnDzrNzaBiY7e94gx7ZncnUFteeYYkrklGjmwiBroZSUpAZ0invqHhNq/m3QGTBSv64ho5MmHkLjM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf19.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id A48F78C43D; Thu, 29 Jan 2026 00:26:39 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf19.hostedemail.com (Postfix) with ESMTPA id 44B0D20027; Thu, 29 Jan 2026 00:26:36 +0000 (UTC) Date: Wed, 28 Jan 2026 19:26:46 -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 04/30] ring-buffer: Add non-consuming read for ring-buffer remotes Message-ID: <20260128192646.02cf1b28@gandalf.local.home> In-Reply-To: <20260126104419.1649811-5-vdonnefort@google.com> References: <20260126104419.1649811-1-vdonnefort@google.com> <20260126104419.1649811-5-vdonnefort@google.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: w83yetxxzut7c8f5ts7rffnwaoyqf9pa X-Rspamd-Server: rspamout04 X-Rspamd-Queue-Id: 44B0D20027 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1/rdl/XabBL++DHiZHfOLAsNiVHUmtio3E= X-HE-Tag: 1769646396-519553 X-HE-Meta: U2FsdGVkX18lKQWYiJxaOCSWK0x0w5aJllREXXSd4bijFpbilRGhh2NpQyQLmmXniCcqsVYArp/P5dvymZnfUr6Tp5GWPmuFEZcJxl5wPHX9XAGSqz+ShetgwprGaKwnteEK7ZjWWJaEHIHNg0ZYgbV9fwe2ZTC3XWzcnLex7lH9r2JWgg7cu2SGUqwPnapdxBYIEXCx1X7ZUaYzliCcW3S1IVfmC2TOhQhqe3ZYuTwwU7NOst3koU+EuoY/Br/jXm7XGu934AopVPBgHF5PWACD0/vQV5DMWOQbmwPlf47IV5FUTU/G6N1KfA/874sOX5SANF/hEC6BDBm9H3lNQB/XQX8vlpEhYCgdhl4jXixh5YHmnKiJ4aMyXPeaTwOtHw7ysFTRSzalwULxGYWvSA== On Mon, 26 Jan 2026 10:43:53 +0000 Vincent Donnefort wrote: > Hopefully, the remote will only swap pages on the kernel instruction (via > the swap_reader_page() callback). This means we know at what point the > ring-buffer geometry has changed. It is therefore possible to rearrange > the kernel view of that ring-buffer to allow non-consuming read. > > Signed-off-by: Vincent Donnefort Reviewed-by: Steven Rostedt (Google) -- Steve