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 8DD0BC43334 for ; Tue, 28 Jun 2022 07:41:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=UD9YVY9ZB2SreVWwLPPJY6qUByKUD1G7XWQWOhna7g4=; b=qFHa60ji3MzL1S kMH8h7j8nU7rGjbKpvNUfYikoVAESboKbDQT2pcAQwR9hDVtuUC60JFsnjW5aajLjVBwizN9qFl8x YAQwmBXWlCh9bxH+nAITKSCCaWu0Hm9uuqXBo8il6cOplJbkj3amt1MFmCJiZhRsv7tpIh+9q/Bgh f6izd1lXRYw8d2WBOBSnsVRjKdqWi3FtiXEVAZX+wIG7q7m47g7SpM3C/N9p3JE0U7WMkwTTQP54p tGahxK2HzgIAycMEpKw++3tnXOCN1FvCbPzJKmj9g0559jHy7JUAu+eYqM6XFkNyw6bn66uuTZL7T qdiShmDXIDDbWkmweOuA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o65pd-0050hV-44; Tue, 28 Jun 2022 07:40:21 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o65pZ-0050ev-8o for linux-arm-kernel@lists.infradead.org; Tue, 28 Jun 2022 07:40:19 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 73B0D152B; Tue, 28 Jun 2022 00:40:11 -0700 (PDT) Received: from [10.162.42.7] (unknown [10.162.42.7]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C95CD3F66F; Tue, 28 Jun 2022 00:40:07 -0700 (PDT) Message-ID: <967c0a4f-c864-21ec-33f1-5e3943a42409@arm.com> Date: Tue, 28 Jun 2022 13:10:05 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH 0/8] arm64/perf: Enable branch stack sampling Content-Language: en-US To: Will Deacon Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peterz@infradead.org, acme@kernel.org, mark.rutland@arm.com, Catalin Marinas , James Clark , Rob Herring , Marc Zyngier , Ingo Molnar , linux-perf-users@vger.kernel.org References: <20220613100119.684673-1-anshuman.khandual@arm.com> <20220627110105.GF22095@willie-the-truck> From: Anshuman Khandual In-Reply-To: <20220627110105.GF22095@willie-the-truck> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220628_004017_408220_65260007 X-CRM114-Status: GOOD ( 11.52 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/27/22 16:31, Will Deacon wrote: > On Mon, Jun 13, 2022 at 03:31:11PM +0530, Anshuman Khandual wrote: >> This series enables perf branch stack sampling support on arm64 platform >> via a new arch feature called Branch Record Buffer Extension (BRBE). All >> relevant register definitions could be accessed here. >> >> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers >> >> This series applies on v5.19-rc2 after the BRBE related perf ABI changes series >> (V6) that was posted earlier. >> >> https://lore.kernel.org/linux-arm-kernel/20220610035101.424112-1-anshuman.khandual@arm.com/ >> >> Following issues remain inconclusive >> >> - Jame's concerns regarding permission inadequacy related to perfmon_capable() >> - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable() > > afaict, the capability stuff remains unresolved with the SPE driver, so I'd > really like to see it fixed there first before we add more broken drivers. > > https://lore.kernel.org/r/20220118100702.GB16547@willie-the-truck Hello Will, I did go through the above mentioned thread, but could not understand (clear enough) - what needs to be done. Could you please help summerize the problem and possible solutions which I can start looking into. Thank you. - Anshuman _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel