From: Stephane Eranian <eranian@google.com>
To: linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, kim.phillips@amd.com, acme@redhat.com,
jolsa@redhat.com, songliubraving@fb.com
Subject: [PATCH v6 04/12] perf/x86/amd: add branch-brs helper event for Fam19h BRS
Date: Tue, 8 Feb 2022 13:16:29 -0800 [thread overview]
Message-ID: <20220208211637.2221872-5-eranian@google.com> (raw)
In-Reply-To: <20220208211637.2221872-1-eranian@google.com>
Add a pseudo event called branch-brs to help use the FAM Fam19h
Branch Sampling feature (BRS). BRS samples taken branches, so it is best used
when sampling on a retired taken branch event (0xc4) which is what BRS
captures. Instead of trying to remember the event code or actual event name,
users can simply do:
$ perf record -b -e cpu/branch-brs/ -c 1000037 .....
Signed-off-by: Stephane Eranian <eranian@google.com>
---
arch/x86/events/amd/core.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 44d8f618bb3e..597defee1e02 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -1105,8 +1105,24 @@ static struct attribute_group group_caps_amd_brs = {
.is_visible = amd_brs_is_visible,
};
+#define AMD_FAM19H_BRS_EVENT 0xc4 /* Fam19h RETIRED_TAKEN_BRANCH_INSTRUCTIONS */
+EVENT_ATTR_STR(branch-brs, amd_branch_brs,
+ "event=" __stringify(AMD_FAM19H_BRS_EVENT)"\n");
+
+static struct attribute *amd_brs_events_attrs[] = {
+ EVENT_PTR(amd_branch_brs),
+ NULL,
+};
+
+static struct attribute_group group_events_amd_brs = {
+ .name = "events",
+ .attrs = amd_brs_events_attrs,
+ .is_visible = amd_brs_is_visible,
+};
+
static const struct attribute_group *amd_attr_update[] = {
&group_caps_amd_brs,
+ &group_events_amd_brs,
NULL,
};
--
2.35.0.263.gb82422642f-goog
next prev parent reply other threads:[~2022-02-08 22:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-08 21:16 [PATCH v6 00/12] perf/x86/amd: Add AMD Fam19h Branch Sampling support Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 01/12] perf/core: add perf_clear_branch_entry_bitfields() helper Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 02/12] x86/cpufeatures: add AMD Fam19h Branch Sampling feature Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 03/12] perf/x86/amd: add AMD Fam19h Branch Sampling support Stephane Eranian
2022-02-08 21:16 ` Stephane Eranian [this message]
2022-02-08 21:16 ` [PATCH v6 05/12] perf/x86/amd: enable branch sampling priv level filtering Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 06/12] perf/x86/amd: add AMD branch sampling period adjustment Stephane Eranian
2022-02-09 15:32 ` Peter Zijlstra
2022-03-04 15:45 ` Peter Zijlstra
2022-03-09 23:03 ` Stephane Eranian
2022-03-15 12:08 ` Peter Zijlstra
2022-03-17 17:11 ` Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 07/12] perf/x86/amd: make Zen3 branch sampling opt-in Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 08/12] ACPI: add perf low power callback Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 09/12] perf/x86/amd: add idle hooks for branch sampling Stephane Eranian
2022-02-08 21:16 ` [PATCH v6 10/12] perf tools: Improve IBS error handling Stephane Eranian
2022-02-09 15:47 ` Arnaldo Carvalho de Melo
2022-03-15 6:49 ` Ravi Bangoria
2022-03-15 2:01 ` Stephane Eranian
2022-03-15 6:23 ` Ravi Bangoria
2022-03-15 7:12 ` Stephane Eranian
2022-03-15 7:45 ` Ravi Bangoria
2022-03-16 0:03 ` Stephane Eranian
2022-03-16 11:07 ` Ravi Bangoria
2022-03-16 11:16 ` Ravi Bangoria
2022-02-08 21:16 ` [PATCH v6 11/12] perf tools: Improve error handling of AMD Branch Sampling Stephane Eranian
2022-02-16 14:17 ` Arnaldo Carvalho de Melo
2022-02-08 21:16 ` [PATCH v6 12/12] perf report: add addr_from/addr_to sort dimensions Stephane Eranian
2022-02-16 14:21 ` Arnaldo Carvalho de Melo
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