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 71FCCD46C01 for ; Thu, 29 Jan 2026 00:26:53 +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=HaFIZYsDltYEpS6mHJyDR3fu7UUXnbuSHzd5t4zdWjo=; b=MUSm+nW/em50lEGTANDgMkDftR HH9CELLYHPB+OMpagplCZ9D2vxe/vivNUQmRFlJiCvET922QoEICIp3VOpXB5iQdC2VrdOIUUjNpu Vr8E+o5NOoxPJTlibVEs95LFTjzpP+A7O2Zvh/JEtIBv0Y3rCUTVtBdP4tu9WOWlEn/dmXKf+FzYZ nbCVJ2BfLRg4mcVmcZZaBHdKcDiekbaOfq1+YNKjPRlGpFsTO4rZmrq1zCmhKt8D9XIsrZZsI91pN H8yqVMxVXwDVdkL1DLZTVBh3jKIzpdjzGSGHT/VUC/QfKru0xRo3gS2Dab4CcBI/+gPscPvNvy+Lz Jj+Cn+pw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vlFrz-0000000GyK6-2Drl; Thu, 29 Jan 2026 00:26:47 +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 1vlFru-0000000GyIv-3NL0 for linux-arm-kernel@lists.infradead.org; Thu, 29 Jan 2026 00:26:46 +0000 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) 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== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260128_162645_166867_4C95F6B2 X-CRM114-Status: UNSURE ( 7.81 ) X-CRM114-Notice: Please train this message. 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 10:43:53 +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