From patchwork Thu May 18 17:24:31 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 9734979 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 03FC7601A1 for ; Thu, 18 May 2017 17:32:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DCC8528755 for ; Thu, 18 May 2017 17:32:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CF11D288AE; Thu, 18 May 2017 17:32:15 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6A13F28755 for ; Thu, 18 May 2017 17:32:15 +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:References: In-Reply-To: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:List-Owner; bh=aclbkb5Fzd2hEU+oXY7lfbBBf9ubnO7C4pNupWXVoXI=; b=lL/g6TuDZOklrHmAQhcdS4PfZm n5/fnOyCPMeKRGutDR0Xz2L8zUTw2BTMOYesWLQuQAeO/id04EjwUSwsz7R/xoltwSoNZFNX7X0RU 4okmNqwv/uN3//AjgXPA0K2e37c2QahnwahSCCQw56Am2nu1s05KX73fnh0E5Bwzv2Lt+aNoEUm2y AXUWsJkB+qAm1DhTRKgajkrj88L1FyG9u1r2eysm+Sk4TchW/wetOYBYWLHsBIXsE+Op5eqN0mQrw J00968kir438ZYGX16AfDWkTidYIcm83X2WVUpitJUiicisgVMgfMcQR+gWG5wug1IH2wPihJfVAM vfJZYYrA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dBPHb-00013F-0s; Thu, 18 May 2017 17:32:15 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dBPAV-0004Wc-EL for linux-arm-kernel@lists.infradead.org; Thu, 18 May 2017 17:24:58 +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 9F6451650; Thu, 18 May 2017 10:24:34 -0700 (PDT) Received: from edgewater-inn.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 705803F7C4; Thu, 18 May 2017 10:24:34 -0700 (PDT) Received: by edgewater-inn.cambridge.arm.com (Postfix, from userid 1000) id E2C0E1AE3935; Thu, 18 May 2017 18:24:34 +0100 (BST) From: Will Deacon To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 3/5] perf/core: Add PERF_AUX_FLAG_COLLISION to report colliding samples Date: Thu, 18 May 2017 18:24:31 +0100 Message-Id: <1495128273-13941-4-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1495128273-13941-1-git-send-email-will.deacon@arm.com> References: <1495128273-13941-1-git-send-email-will.deacon@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170518_102455_547378_E07F7C54 X-CRM114-Status: UNSURE ( 9.51 ) X-CRM114-Notice: Please train this message. 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: mark.rutland@arm.com, robh@kernel.org, kim.phillips@arm.com, mathieu.poirier@linaro.org, pawel.moll@arm.com, suzuki.poulose@arm.com, marc.zyngier@arm.com, Will Deacon , linux-kernel@vger.kernel.org, alexander.shishkin@linux.intel.com, peterz@infradead.org, mingo@redhat.com, tglx@linutronix.de 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 The ARM SPE architecture permits an implementation to ignore a sample if the sample is due to be taken whilst another sample is already being produced. In this case, it is desirable to report the collision to userspace, as they may want to lower the sample period. This patch adds a PERF_AUX_FLAG_COLLISION flag, so that such events can be relayed to userspace. Signed-off-by: Will Deacon --- include/uapi/linux/perf_event.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index b1c0b187acfe..157034597d21 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -916,6 +916,7 @@ enum perf_callchain_context { #define PERF_AUX_FLAG_TRUNCATED 0x01 /* record was truncated to fit */ #define PERF_AUX_FLAG_OVERWRITE 0x02 /* snapshot from overwrite mode */ #define PERF_AUX_FLAG_PARTIAL 0x04 /* record contains gaps */ +#define PERF_AUX_FLAG_COLLISION 0x08 /* sample collided with another */ #define PERF_FLAG_FD_NO_GROUP (1UL << 0) #define PERF_FLAG_FD_OUTPUT (1UL << 1)