From patchwork Thu Sep 28 14:09:47 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 9976197 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 DEEF660365 for ; Thu, 28 Sep 2017 14:10:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D057E295DA for ; Thu, 28 Sep 2017 14:10:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C4A9A29601; Thu, 28 Sep 2017 14:10:10 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED 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 52C1A295DA for ; Thu, 28 Sep 2017 14:10:10 +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=S2DZH88FfBBmMr5WPcxytaLUBjO6bmVa9w1VUSzvoxM=; b=J2tF0na2ocxZfFYtUzx/6MZtHx F/8OCcoeFxQingxwHEpJUcHERuPcDoBtd4wgVAM+pNt/htHo7SOQ7EYa0wnE3NYwnwFudi1vtXigR UhF5lrXZUndXR9zy6fis1sJz1Li27rulUc9hnBrMQUPYGynwa0fP7sGYsFhh2k6+mfRr1IaxHVNrS IYVnZ6EWvdfTkM1Wk7qqOw73ran0sBxQ4zWK5pZlhta7wAyyxC2XPPnvPDXmTYlXdwCDtH3f+62l4 IyyfcACMQym2hxp93m/TeLKQcf4EI0cFoIy+dkpgA17ZP8CejnQ/bk++MrnYwvag5K8JeF5+MTZkX xyRUQ+YA==; 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 1dxZVr-0003Th-AR; Thu, 28 Sep 2017 14:10:03 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dxZVm-0003OS-Qr for linux-arm-kernel@lists.infradead.org; Thu, 28 Sep 2017 14:10:00 +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 32427164F; Thu, 28 Sep 2017 07:09:38 -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 03C1A3F7C4; Thu, 28 Sep 2017 07:09:38 -0700 (PDT) Received: by edgewater-inn.cambridge.arm.com (Postfix, from userid 1000) id 9785E1AE305A; Thu, 28 Sep 2017 15:09:52 +0100 (BST) From: Will Deacon To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 3/7] perf/core: Add PERF_AUX_FLAG_COLLISION to report colliding samples Date: Thu, 28 Sep 2017 15:09:47 +0100 Message-Id: <1506607791-8621-4-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1506607791-8621-1-git-send-email-will.deacon@arm.com> References: <1506607791-8621-1-git-send-email-will.deacon@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170928_070958_999575_F528DBED X-CRM114-Status: UNSURE ( 9.43 ) 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 140ae638cfd6..7ca1b22ea417 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -941,6 +941,7 @@ 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)