From patchwork Thu Jan 10 13:53:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Murray X-Patchwork-Id: 10755815 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 20E2F14DE for ; Thu, 10 Jan 2019 13:56:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0CC4729031 for ; Thu, 10 Jan 2019 13:56:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F3DF22984F; Thu, 10 Jan 2019 13:56:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7CB4B29031 for ; Thu, 10 Jan 2019 13:56:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=FI8PaTk8P7Gkiz0KFJi/T+xivjJnSyVzW8chVvOUw3A=; b=Oli KdO6y63psUPR2EHWq7Dq7EK2EEmr9Y7XtDhckdGC8FFKMJr+GEiSHWZ0WXXOJjlHHm2lOsJBcd13B Mj0f4RleyVBZYvCFCJAZfbs0wsSvMcx9icfws2M/nPxuil9uryV/9bJ+73me2lIGhRb2/FS+paXho 62m531ZuKF9iqG0dpMg+iVIjiH0Q73cQBEm1/v9uiVdIZis5S6D191IqycdJP7Wq447QpuBoe+WZJ hz8tPyON9hXglLia8q0ZpL/kJUFEniv6UrOXslSIS8uiyJMvGLJPRxr0av9OwfXxHvrPE95McmSFy zrzhaNcQ9hYI6+bnu2q2tbuYvvzCeBw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1ghapI-0000iB-Ry; Thu, 10 Jan 2019 13:56:52 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1ghamH-00053G-Qo for linux-arm-kernel@lists.infradead.org; Thu, 10 Jan 2019 13:53:50 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8E4951596; Thu, 10 Jan 2019 05:53:45 -0800 (PST) Received: from e119886-lin.cambridge.arm.com (unknown [10.37.6.11]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 303203F5AF; Thu, 10 Jan 2019 05:53:41 -0800 (PST) From: Andrew Murray To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Richard Henderson , Ivan Kokshaysky , Matt Turner , Will Deacon , Mark Rutland , Shawn Guo , Sascha Hauer , Benjamin Herrenschmidt , Paul Mackerras , Thomas Gleixner , Borislav Petkov , Russell King , suzuki.poulose@arm.com, robin.murphy@arm.com, Michael Ellerman Subject: [PATCH v5 00/12] perf/core: Generalise event exclusion checking Date: Thu, 10 Jan 2019 13:53:22 +0000 Message-Id: <1547128414-50693-1-git-send-email-andrew.murray@arm.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190110_055346_453536_D7CF524F X-CRM114-Status: GOOD ( 17.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-alpha@vger.kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Many PMU drivers do not have the capability to exclude counting events that occur in specific contexts such as idle, kernel, guest, etc. These drivers indicate this by returning an error in their event_init upon testing the events attribute flags. However this approach requires that each time a new event modifier is added to perf, all the perf drivers need to be modified to indicate that they don't support the attribute. This results in additional boiler-plate code common to many drivers that needs to be maintained. Furthermore the drivers are not consistent with regards to the error value they return when reporting unsupported attributes. This patchset allow PMU drivers to advertise their inability to exclude based on context via a new capability: PERF_PMU_CAP_NO_EXCLUDE. This allows the perf core to reject requests for exclusion events where there is no support in the PMU. This is a functional change, in particular: - Some drivers will now additionally (but correctly) report unsupported exclusion flags. It's typical for existing userspace tools such as perf to handle such errors by retrying the system call without the unsupported flags. - Drivers that do not support any exclusion that previously reported -EPERM or -EOPNOTSUPP will now report -EINVAL - this is consistent with the majority and results in userspace perf retrying without exclusion. All drivers touched by this patchset have been compile tested. Changes from v4: - Squashed Cavium TX2 patch into drivers/perf patch - Removed duplicate patch subjects by using 'strengthen ..' wording to indicate patches that use PERF_PMU_CAP_NO_EXCLUDE which make behavioural changes - Added additional information to commit messages Changes from v3: - Added PERF_PMU_CAP_NO_EXCLUDE to Cavium TX2 PMU driver Changes from v2: - Invert logic from CAP_EXCLUDE to CAP_NO_EXCLUDE Changes from v1: - Changed approach from explicitly rejecting events in unsupporting PMU drivers to explicitly advertising a capability in PMU drivers that do support exclusion events - Added additional information to tools/perf/design.txt - Rename event_has_exclude_flags to event_has_any_exclude_flag and update commit log to reflect it's a function Andrew Murray (12): perf/doc: update design.txt for exclude_{host|guest} flags perf/core: add function to test for event exclusion flags perf/core: add PERF_PMU_CAP_NO_EXCLUDE for exclusion incapable PMUs alpha: perf/core: strengthen exclude checks with PERF_PMU_CAP_NO_EXCLUDE arm: perf: conditionally use PERF_PMU_CAP_NO_EXCLUDE arm: perf/core: use PERF_PMU_CAP_NO_EXCLUDE for exclude incapable PMUs drivers/perf: perf/core: use PERF_PMU_CAP_NO_EXCLUDE for exclude incapable PMUs drivers/perf: perf/core: strengthen exclude checks with PERF_PMU_CAP_NO_EXCLUDE powerpc: perf/core: use PERF_PMU_CAP_NO_EXCLUDE for exclude incapable PMUs x86: perf/core: use PERF_PMU_CAP_NO_EXCLUDE for exclude incapable PMUs x86: perf/core: strengthen exclude checks with PERF_PMU_CAP_NO_EXCLUDE perf/core: remove unused perf_flags arch/alpha/kernel/perf_event.c | 7 +------ arch/arm/mach-imx/mmdc.c | 9 ++------- arch/arm/mm/cache-l2x0-pmu.c | 9 +-------- arch/powerpc/perf/hv-24x7.c | 10 +--------- arch/powerpc/perf/hv-gpci.c | 10 +--------- arch/powerpc/perf/imc-pmu.c | 19 +------------------ arch/x86/events/amd/ibs.c | 13 +------------ arch/x86/events/amd/iommu.c | 6 +----- arch/x86/events/amd/power.c | 10 ++-------- arch/x86/events/amd/uncore.c | 7 ++----- arch/x86/events/intel/cstate.c | 12 +++--------- arch/x86/events/intel/rapl.c | 9 ++------- arch/x86/events/intel/uncore.c | 9 +-------- arch/x86/events/intel/uncore_snb.c | 9 ++------- arch/x86/events/msr.c | 10 ++-------- drivers/perf/arm-cci.c | 10 +--------- drivers/perf/arm-ccn.c | 6 ++---- drivers/perf/arm_dsu_pmu.c | 9 ++------- drivers/perf/arm_pmu.c | 15 +++++---------- drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c | 1 + drivers/perf/hisilicon/hisi_uncore_hha_pmu.c | 1 + drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c | 1 + drivers/perf/hisilicon/hisi_uncore_pmu.c | 9 --------- drivers/perf/qcom_l2_pmu.c | 9 +-------- drivers/perf/qcom_l3_pmu.c | 8 +------- drivers/perf/thunderx2_pmu.c | 10 +--------- drivers/perf/xgene_pmu.c | 6 +----- include/linux/perf_event.h | 10 ++++++++++ include/uapi/linux/perf_event.h | 2 -- kernel/events/core.c | 9 +++++++++ tools/include/uapi/linux/perf_event.h | 2 -- tools/perf/design.txt | 4 ++++ 32 files changed, 63 insertions(+), 198 deletions(-)