From: kan.liang@linux.intel.com
To: acme@kernel.org, jolsa@redhat.com, peterz@infradead.org,
mingo@redhat.com, linux-kernel@vger.kernel.org
Cc: namhyung@kernel.org, adrian.hunter@intel.com,
mathieu.poirier@linaro.org, ravi.bangoria@linux.ibm.com,
alexey.budankov@linux.intel.com, vitaly.slobodskoy@intel.com,
pavel.gerasimov@intel.com, mpe@ellerman.id.au,
eranian@google.com, ak@linux.intel.com,
Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH 02/12] perf tools: Support PERF_SAMPLE_BRANCH_HW_INDEX
Date: Fri, 28 Feb 2020 08:30:01 -0800 [thread overview]
Message-ID: <20200228163011.19358-3-kan.liang@linux.intel.com> (raw)
In-Reply-To: <20200228163011.19358-1-kan.liang@linux.intel.com>
From: Kan Liang <kan.liang@linux.intel.com>
A new branch sample type PERF_SAMPLE_BRANCH_HW_INDEX has been introduced
in latest kernel.
Enable HW_INDEX by default in LBR call stack mode.
If kernel doesn't support the sample type, switching it off.
Add HW_INDEX in attr_fprintf as well. User can check whether the branch
sample type is set via debug information or header.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
tools/perf/util/evsel.c | 15 ++++++++++++---
tools/perf/util/evsel.h | 1 +
tools/perf/util/perf_event_attr_fprintf.c | 1 +
3 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 05883a45de5b..816d930d774e 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -712,7 +712,8 @@ static void __perf_evsel__config_callchain(struct evsel *evsel,
attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
PERF_SAMPLE_BRANCH_CALL_STACK |
PERF_SAMPLE_BRANCH_NO_CYCLES |
- PERF_SAMPLE_BRANCH_NO_FLAGS;
+ PERF_SAMPLE_BRANCH_NO_FLAGS |
+ PERF_SAMPLE_BRANCH_HW_INDEX;
}
} else
pr_warning("Cannot use LBR callstack with branch stack. "
@@ -763,7 +764,8 @@ perf_evsel__reset_callgraph(struct evsel *evsel,
if (param->record_mode == CALLCHAIN_LBR) {
perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
- PERF_SAMPLE_BRANCH_CALL_STACK);
+ PERF_SAMPLE_BRANCH_CALL_STACK |
+ PERF_SAMPLE_BRANCH_HW_INDEX);
}
if (param->record_mode == CALLCHAIN_DWARF) {
perf_evsel__reset_sample_bit(evsel, REGS_USER);
@@ -1673,6 +1675,8 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
evsel->core.attr.ksymbol = 0;
if (perf_missing_features.bpf)
evsel->core.attr.bpf_event = 0;
+ if (perf_missing_features.branch_hw_idx)
+ evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->core.attr.sample_id_all = 0;
@@ -1784,7 +1788,12 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
+ if (!perf_missing_features.branch_hw_idx &&
+ (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
+ perf_missing_features.branch_hw_idx = true;
+ pr_debug2("switching off branch HW index support\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
perf_missing_features.aux_output = true;
pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
goto out_close;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 99a0cb60c556..33804740e2ca 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -119,6 +119,7 @@ struct perf_missing_features {
bool ksymbol;
bool bpf;
bool aux_output;
+ bool branch_hw_idx;
};
extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
index 651203126c71..355d3458d4e6 100644
--- a/tools/perf/util/perf_event_attr_fprintf.c
+++ b/tools/perf/util/perf_event_attr_fprintf.c
@@ -50,6 +50,7 @@ static void __p_branch_sample_type(char *buf, size_t size, u64 value)
bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
+ bit_name(HW_INDEX),
{ .name = NULL, }
};
#undef bit_name
--
2.17.1
next prev parent reply other threads:[~2020-02-28 16:32 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 16:29 [PATCH 00/12] Stitch LBR call stack (Perf Tools) kan.liang
2020-02-28 16:30 ` [PATCH 01/12] perf tools: Add hw_idx in struct branch_stack kan.liang
2020-03-04 13:49 ` Arnaldo Carvalho de Melo
2020-03-04 15:45 ` Arnaldo Carvalho de Melo
2020-03-04 16:07 ` Liang, Kan
2020-03-19 14:10 ` [tip: perf/core] tools headers UAPI: Update tools's copy of linux/perf_event.h tip-bot2 for Arnaldo Carvalho de Melo
2020-03-10 0:42 ` [PATCH 01/12] perf tools: Add hw_idx in struct branch_stack Arnaldo Carvalho de Melo
2020-03-10 12:53 ` Liang, Kan
2020-03-19 14:10 ` [tip: perf/core] " tip-bot2 for Kan Liang
2020-02-28 16:30 ` kan.liang [this message]
2020-03-05 20:25 ` [PATCH 02/12] perf tools: Support PERF_SAMPLE_BRANCH_HW_INDEX Arnaldo Carvalho de Melo
2020-03-05 21:02 ` Liang, Kan
2020-03-05 23:17 ` Arnaldo Carvalho de Melo
2020-03-19 14:10 ` [tip: perf/core] perf evsel: " tip-bot2 for Kan Liang
2020-02-28 16:30 ` [PATCH 03/12] perf header: Add check for event attr kan.liang
2020-03-19 14:10 ` [tip: perf/core] perf header: Add check for unexpected use of reserved membrs in " tip-bot2 for Kan Liang
2020-02-28 16:30 ` [PATCH 04/12] perf pmu: Add support for PMU capabilities kan.liang
2020-02-28 16:30 ` [PATCH 05/12] perf header: Support CPU " kan.liang
2020-02-28 16:30 ` [PATCH 06/12] perf machine: Refine the function for LBR call stack reconstruction kan.liang
2020-02-28 16:30 ` [PATCH 07/12] perf tools: Stitch LBR call stack kan.liang
2020-02-28 16:30 ` [PATCH 08/12] perf report: Add option to enable the LBR stitching approach kan.liang
2020-02-28 16:30 ` [PATCH 09/12] perf script: " kan.liang
2020-02-28 16:30 ` [PATCH 10/12] perf top: " kan.liang
2020-02-28 16:30 ` [PATCH 11/12] perf c2c: " kan.liang
2020-02-28 16:30 ` [PATCH 12/12] perf hist: Add fast path for duplicate entries check approach kan.liang
2020-03-04 13:33 ` [PATCH 00/12] Stitch LBR call stack (Perf Tools) Arnaldo Carvalho de Melo
2020-03-06 9:39 ` Jiri Olsa
2020-03-06 19:13 ` Liang, Kan
2020-03-06 20:06 ` Arnaldo Carvalho de Melo
2020-03-09 13:27 ` Arnaldo Carvalho de Melo
2020-03-09 13:42 ` Liang, Kan
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