From nobody Mon Feb 9 05:40:08 2026 Received: from mail-dl1-f73.google.com (mail-dl1-f73.google.com [74.125.82.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A190033033A for ; Thu, 8 Jan 2026 19:12:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767899523; cv=none; b=CmOsHVt+M6U6zwJBloBB9JNi/sZtjzHvuT6kzDk/o/AGYdQMKFP9Ickzb+ToN8oDSfVpWb+iute3/DSZkuUEDFrvjVIOPHrbkhYMIJUZd/uu5uY1tgLuIS6GmTvzbR3uebrLgnOH3OnFmn9WuRuZoz2ExBRl9sxmgb4c3SJZtqc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767899523; c=relaxed/simple; bh=SqSW1HSI4Y1aSQ8k/4kIp/osnr+X4b4UKAj2lYUJFSY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=RmWCFd6RFtEnlnFJG/8FhcyeOvx9iiIpN+/Zg2eX5uoYHoP3BUWLVHlbIDyAy33IVpUrrYBDKbljNSbLrW7R20HAHT5IfyhlFO8UkqLi5kZbtLOmJGj0d0zyaqOWsie9hKFw6UW0hBbhpwkdjuHO9GjeIyaeQaXQRoBBV9f6JRM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=FAuI/e6m; arc=none smtp.client-ip=74.125.82.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="FAuI/e6m" Received: by mail-dl1-f73.google.com with SMTP id a92af1059eb24-119e80a89b1so10527061c88.0 for ; Thu, 08 Jan 2026 11:12:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1767899521; x=1768504321; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=fOdr8IbPINiK2ARzYXL2NZXJz57sKNu7nLLXlg9pgVg=; b=FAuI/e6m5iKsc88kBgMEGxmUq8fNHFnHD1rG1KO+LOPyg/LdcKJmwNmdgsjot8TrRD 8G4n32wf61NnkrwG8B/bRtNTzQCc/uDgtTBKE7+4VVZNc9Qqc2pHahA0ibBsoW3KZXT4 8LAHBEJS56v76WKAqjMtBfCympHe62M8XytwBUnUWC26UL86+o0T4mJ4VtJ2HN5Ogq2N RzfqZsy2/WI6Gj9zW9XOaHfOb67Gw4TdV6fV2y4BR2t2uKDHvU8o8jnpODLOmTcuzDOl n4QGXy/dQOubICQqvrKQGHEgDNkOWY0UJ3tAszd8jcQvIGNBjZgBg4GCcJYIjhCswM// RH9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767899521; x=1768504321; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=fOdr8IbPINiK2ARzYXL2NZXJz57sKNu7nLLXlg9pgVg=; b=mInb/tSwrbdZD4bbeQzr8BJF6u9zOBRwHDeQbKIA7QqJRZjppoERyqKVQZ7gjLmS7O a2r9r91K+uFYaNOjGZvvUaLFvNIGSM3VDakNN6Q9JEkYn0Xj3i2VND4if7P3xAQg0VR2 HwUGtlSKDrZFYbpEhd8g9g7lrZWuBpqSVtgvIiMAx2L12Buh+1aHlQ4sf/5961cD6yl+ YYVEDs7Rub37r6uOz42xn9uK7odYM3O9PPRckpqiwfFudh1s0BPN3MhhU0Uo8O4Mj0sy sCWV1AQd2z1B23CclathmJxdtAICOLQxyIxaF+0mq4JwFW8wUZmKj9SiId7PJzmC61qz b+GA== X-Forwarded-Encrypted: i=1; AJvYcCXII9FEBPgZuZcE6tJw+usS//rLyoH3kgeCh0ZMWsDcpXuGuSs5u1v6HVb8+fuO1g3gDwb4DKWh8E1bEkw=@vger.kernel.org X-Gm-Message-State: AOJu0YyQ3pVY5Q71EsEHYODrK4UuXHyG6FaPmJ+hbfvjS8leninabzIE twgDeV4UF4b7Iy33tlsm4ZjdglE+iQYKLdsgnkcXlBseMIHDMbN4pmhKths1gzyEEC3T/UcPTPf pkXSRvLzOqA== X-Google-Smtp-Source: AGHT+IFcOWE2quG2Fo1o19pSXXZ4n2dWrBi8Ysraf6hMlSO44GNOg37dSaIL9lVbr0QQMpPmqfKjex5YebID X-Received: from dlbdt12.prod.google.com ([2002:a05:7022:258c:b0:11b:2984:3606]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:31e:b0:11d:fc72:e17f with SMTP id a92af1059eb24-121f8ae75f4mr6734306c88.18.1767899520602; Thu, 08 Jan 2026 11:12:00 -0800 (PST) Date: Thu, 8 Jan 2026 11:10:48 -0800 In-Reply-To: <20260108191105.695131-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260108191105.695131-1-irogers@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260108191105.695131-19-irogers@google.com> Subject: [PATCH v10 18/35] perf jevents: Add br metric group for branch statistics on Intel From: Ian Rogers To: Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Benjamin Gray , Caleb Biggers , Edward Baker , Ian Rogers , Ingo Molnar , James Clark , Jing Zhang , Jiri Olsa , John Garry , Leo Yan , Namhyung Kim , Perry Taylor , Peter Zijlstra , Samantha Alt , Sandipan Das , Thomas Falcon , Weilin Wang , Xu Yang , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The br metric group for branches itself comprises metric groups for total, taken, conditional, fused and far metric groups using json events. Conditional taken and not taken metrics are specific to Icelake and later generations, so the presence of the event is used to determine whether the metric should exist. Tested-by: Thomas Falcon Signed-off-by: Ian Rogers --- tools/perf/pmu-events/intel_metrics.py | 138 +++++++++++++++++++++++++ 1 file changed, 138 insertions(+) diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events= /intel_metrics.py index 05f3d94ec5d5..e1944d821248 100755 --- a/tools/perf/pmu-events/intel_metrics.py +++ b/tools/perf/pmu-events/intel_metrics.py @@ -124,6 +124,143 @@ def Tsx() -> Optional[MetricGroup]: ], description=3D"Breakdown of transactional memory statistics") =20 =20 +def IntelBr(): + ins =3D Event("instructions") + + def Total() -> MetricGroup: + br_all =3D Event("BR_INST_RETIRED.ALL_BRANCHES", "BR_INST_RETIRED.= ANY") + br_m_all =3D Event("BR_MISP_RETIRED.ALL_BRANCHES", + "BR_INST_RETIRED.MISPRED", + "BR_MISP_EXEC.ANY") + br_clr =3D None + try: + br_clr =3D Event("BACLEARS.ANY", "BACLEARS.ALL") + except: + pass + + br_r =3D d_ratio(br_all, interval_sec) + ins_r =3D d_ratio(ins, br_all) + misp_r =3D d_ratio(br_m_all, br_all) + clr_r =3D d_ratio(br_clr, interval_sec) if br_clr else None + + return MetricGroup("lpm_br_total", [ + Metric("lpm_br_total_retired", + "The number of branch instructions retired per second."= , br_r, + "insn/s"), + Metric( + "lpm_br_total_mispred", + "The number of branch instructions retired, of any type, t= hat were " + "not correctly predicted as a percentage of all branch ins= trucions.", + misp_r, "100%"), + Metric("lpm_br_total_insn_between_branches", + "The number of instructions divided by the number of br= anches.", + ins_r, "insn"), + Metric("lpm_br_total_insn_fe_resteers", + "The number of resync branches per second.", clr_r, "re= q/s" + ) if clr_r else None + ]) + + def Taken() -> MetricGroup: + br_all =3D Event("BR_INST_RETIRED.ALL_BRANCHES", "BR_INST_RETIRED.= ANY") + br_m_tk =3D None + try: + br_m_tk =3D Event("BR_MISP_RETIRED.NEAR_TAKEN", + "BR_MISP_RETIRED.TAKEN_JCC", + "BR_INST_RETIRED.MISPRED_TAKEN") + except: + pass + br_r =3D d_ratio(br_all, interval_sec) + ins_r =3D d_ratio(ins, br_all) + misp_r =3D d_ratio(br_m_tk, br_all) if br_m_tk else None + return MetricGroup("lpm_br_taken", [ + Metric("lpm_br_taken_retired", + "The number of taken branches that were retired per sec= ond.", + br_r, "insn/s"), + Metric( + "lpm_br_taken_mispred", + "The number of retired taken branch instructions that were= " + "mispredicted as a percentage of all taken branches.", mis= p_r, + "100%") if misp_r else None, + Metric( + "lpm_br_taken_insn_between_branches", + "The number of instructions divided by the number of taken= branches.", + ins_r, "insn"), + ]) + + def Conditional() -> Optional[MetricGroup]: + try: + br_cond =3D Event("BR_INST_RETIRED.COND", + "BR_INST_RETIRED.CONDITIONAL", + "BR_INST_RETIRED.TAKEN_JCC") + br_m_cond =3D Event("BR_MISP_RETIRED.COND", + "BR_MISP_RETIRED.CONDITIONAL", + "BR_MISP_RETIRED.TAKEN_JCC") + except: + return None + + br_cond_nt =3D None + br_m_cond_nt =3D None + try: + br_cond_nt =3D Event("BR_INST_RETIRED.COND_NTAKEN") + br_m_cond_nt =3D Event("BR_MISP_RETIRED.COND_NTAKEN") + except: + pass + br_r =3D d_ratio(br_cond, interval_sec) + ins_r =3D d_ratio(ins, br_cond) + misp_r =3D d_ratio(br_m_cond, br_cond) + taken_metrics =3D [ + Metric("lpm_br_cond_retired", "Retired conditional branch inst= ructions.", + br_r, "insn/s"), + Metric("lpm_br_cond_insn_between_branches", + "The number of instructions divided by the number of co= nditional " + "branches.", ins_r, "insn"), + Metric("lpm_br_cond_mispred", + "Retired conditional branch instructions mispredicted a= s a " + "percentage of all conditional branches.", misp_r, "100= %"), + ] + if not br_m_cond_nt: + return MetricGroup("lpm_br_cond", taken_metrics) + + br_r =3D d_ratio(br_cond_nt, interval_sec) + ins_r =3D d_ratio(ins, br_cond_nt) + misp_r =3D d_ratio(br_m_cond_nt, br_cond_nt) + + not_taken_metrics =3D [ + Metric("lpm_br_cond_retired", "Retired conditional not taken b= ranch instructions.", + br_r, "insn/s"), + Metric("lpm_br_cond_insn_between_branches", + "The number of instructions divided by the number of no= t taken conditional " + "branches.", ins_r, "insn"), + Metric("lpm_br_cond_mispred", + "Retired not taken conditional branch instructions misp= redicted as a " + "percentage of all not taken conditional branches.", mi= sp_r, "100%"), + ] + return MetricGroup("lpm_br_cond", [ + MetricGroup("lpm_br_cond_nt", not_taken_metrics), + MetricGroup("lpm_br_cond_tkn", taken_metrics), + ]) + + def Far() -> Optional[MetricGroup]: + try: + br_far =3D Event("BR_INST_RETIRED.FAR_BRANCH") + except: + return None + + br_r =3D d_ratio(br_far, interval_sec) + ins_r =3D d_ratio(ins, br_far) + return MetricGroup("lpm_br_far", [ + Metric("lpm_br_far_retired", "Retired far control transfers pe= r second.", + br_r, "insn/s"), + Metric( + "lpm_br_far_insn_between_branches", + "The number of instructions divided by the number of far b= ranches.", + ins_r, "insn"), + ]) + + return MetricGroup("lpm_br", [Total(), Taken(), Conditional(), Far()], + description=3D"breakdown of retired branch instruct= ions") + + def main() -> None: global _args =20 @@ -153,6 +290,7 @@ def main() -> None: Rapl(), Smi(), Tsx(), + IntelBr(), ]) =20 if _args.metricgroups: --=20 2.52.0.457.g6b5491de43-goog