From patchwork Sat Sep 14 10:17:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Mi, Dapeng" X-Patchwork-Id: 13804294 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DBB751D0972; Sat, 14 Sep 2024 07:01:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726297314; cv=none; b=aQ14rG5DQMcGxE1a2urmP3oBd8ICK44IxrRdmkoRLaG64XE6omNMTK7hoQ6INJVBZWI+r0uqMZaQnV5v006FRIQZlDlR+u4WNY2Gdc5K3n3wCvSaOCvLaM96WdJaLAm0CEfERQE1BMFoQIJZUoKMTAv7wr8kvhrBnPokaJRb8d4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726297314; c=relaxed/simple; bh=6rkU41q/MyT0y9yMobn5IXzrkBZx/aO+BTHMgn2NnYU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iBzOuuDbdsfMejesGCAR4PsUA0NsZ2r0dUvqikhYwGHKj1JolCX1jiCxLO7JxLURWCkv0DN2kwu1R9G7jcKAkFfyrZNajPU0zVN+j3PgX+dR+sMnVi6LzUNeFRS4KnDcWBmYzCOKQSWyCIKJdHcZFDMHeLVlczDNtpUr7yDbyDk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=bkMNjsMW; arc=none smtp.client-ip=198.175.65.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="bkMNjsMW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1726297313; x=1757833313; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=6rkU41q/MyT0y9yMobn5IXzrkBZx/aO+BTHMgn2NnYU=; b=bkMNjsMWGm0u1WAHuu8NiTjdvJIgq3hpInfxhHYc57aQIsga2yFs8O+S c15mwOMpBMlMpWu0EOqJ/jE3rrPjNpWZJTtPwB5waWjb3tH2on1mERECi HxBQu35UVxdkFNfc/ENzISxph3uh0MH9AbX6Egr1i4oZqa/BFZNA710mx u8KUzFTOqvkFc/UJ5Z4KUV4iksl/XUINWuXbpre3l1uEGNRJtUdDqFDVt Cmn3n3tRBmHfeyYPkV63A/vTLeTODjRu/ni2DE/ewD4+c1MbJAPvdaF8Z HOp553xNlY9VCbnn3g67VIVJeKduw/oEzi1iHNYw1USwBiKBB2vF6guag A==; X-CSE-ConnectionGUID: MY+juHGRT3ik3e12cp0Rew== X-CSE-MsgGUID: Ed8uzmJeSy6BAFMO665Ncg== X-IronPort-AV: E=McAfee;i="6700,10204,11194"; a="35778874" X-IronPort-AV: E=Sophos;i="6.10,228,1719903600"; d="scan'208";a="35778874" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Sep 2024 00:01:53 -0700 X-CSE-ConnectionGUID: RJiyu6iFRfOHfoErH0Qf7Q== X-CSE-MsgGUID: qDd4tpmRTemmeyynpoIaaw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,228,1719903600"; d="scan'208";a="67951004" Received: from emr.sh.intel.com ([10.112.229.56]) by fmviesa006.fm.intel.com with ESMTP; 14 Sep 2024 00:01:50 -0700 From: Dapeng Mi To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Jim Mattson , Mingwei Zhang , Xiong Zhang , Zhenyu Wang , Like Xu , Jinrong Liang , Yongwei Ma , Dapeng Mi , Dapeng Mi Subject: [kvm-unit-tests patch v6 15/18] x86: pmu: Adjust lower boundary of llc-misses event to 0 for legacy CPUs Date: Sat, 14 Sep 2024 10:17:25 +0000 Message-Id: <20240914101728.33148-16-dapeng1.mi@linux.intel.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240914101728.33148-1-dapeng1.mi@linux.intel.com> References: <20240914101728.33148-1-dapeng1.mi@linux.intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 For these legacy Intel CPUs without clflush/clflushopt support, there is on way to force to trigger a LLC miss and the measured llc misses is possible to be 0. Thus adjust the lower boundary of llc-misses event to 0 to avoid possible false positive. Signed-off-by: Dapeng Mi --- x86/pmu.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/x86/pmu.c b/x86/pmu.c index c9160423..47b6305d 100644 --- a/x86/pmu.c +++ b/x86/pmu.c @@ -82,6 +82,7 @@ struct pmu_event { enum { INTEL_INSTRUCTIONS_IDX = 1, INTEL_REF_CYCLES_IDX = 2, + INTEL_LLC_MISSES_IDX = 4, INTEL_BRANCHES_IDX = 5, }; @@ -892,6 +893,15 @@ int main(int ac, char **av) gp_events_size = sizeof(intel_gp_events)/sizeof(intel_gp_events[0]); instruction_idx = INTEL_INSTRUCTIONS_IDX; branch_idx = INTEL_BRANCHES_IDX; + + /* + * For legacy Intel CPUS without clflush/clflushopt support, + * there is no way to force to trigger a LLC miss, thus set + * the minimum value to 0 to avoid false positives. + */ + if (!this_cpu_has(X86_FEATURE_CLFLUSH)) + gp_events[INTEL_LLC_MISSES_IDX].min = 0; + report_prefix_push("Intel"); set_ref_cycle_expectations(); } else {