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Message-Id: <20230331202949.810326-10-namhyung@kernel.org>
Date: Fri, 31 Mar 2023 13:29:49 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jiri Olsa <jolsa@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org,
Kan Liang <kan.liang@...ux.intel.com>,
Leo Yan <leo.yan@...aro.org>
Subject: [PATCH 9/9] perf intel-pt: Use perf_pmu__scan_file_at() if possible
Intel-PT calls perf_pmu__scan_file() a lot, let's use relative address
when it accesses multiple files at one place.
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/arch/x86/util/intel-pt.c | 52 ++++++++++++++++++-----------
1 file changed, 32 insertions(+), 20 deletions(-)
diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 1e39a034cee9..2cff11de9d8a 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -194,16 +194,19 @@ static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
int pos = 0;
u64 config;
char c;
+ int dirfd;
+
+ dirfd = perf_pmu__event_source_devices_fd();
pos += scnprintf(buf + pos, sizeof(buf) - pos, "tsc");
- if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc", "%d",
- &mtc) != 1)
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "caps/mtc", "%d",
+ &mtc) != 1)
mtc = 1;
if (mtc) {
- if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc_periods", "%x",
- &mtc_periods) != 1)
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "caps/mtc_periods", "%x",
+ &mtc_periods) != 1)
mtc_periods = 0;
if (mtc_periods) {
mtc_period = intel_pt_pick_bit(mtc_periods, 3);
@@ -212,13 +215,13 @@ static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
}
}
- if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_cyc", "%d",
- &psb_cyc) != 1)
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "caps/psb_cyc", "%d",
+ &psb_cyc) != 1)
psb_cyc = 1;
if (psb_cyc && mtc_periods) {
- if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_periods", "%x",
- &psb_periods) != 1)
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "caps/psb_periods", "%x",
+ &psb_periods) != 1)
psb_periods = 0;
if (psb_periods) {
psb_period = intel_pt_pick_bit(psb_periods, 3);
@@ -227,8 +230,8 @@ static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
}
}
- if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
- perf_pmu__scan_file(intel_pt_pmu, "format/branch", "%c", &c) == 1)
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "format/pt", "%c", &c) == 1 &&
+ perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "format/branch", "%c", &c) == 1)
pos += scnprintf(buf + pos, sizeof(buf) - pos, ",pt,branch");
pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf);
@@ -236,6 +239,7 @@ static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format, buf,
&config);
+ close(dirfd);
return config;
}
@@ -488,7 +492,7 @@ static void intel_pt_valid_str(char *str, size_t len, u64 valid)
}
}
-static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
+static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu, int dirfd,
const char *caps, const char *name,
const char *supported, u64 config)
{
@@ -498,11 +502,11 @@ static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
u64 bits;
int ok;
- if (perf_pmu__scan_file(intel_pt_pmu, caps, "%llx", &valid) != 1)
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, caps, "%llx", &valid) != 1)
valid = 0;
if (supported &&
- perf_pmu__scan_file(intel_pt_pmu, supported, "%d", &ok) == 1 && !ok)
+ perf_pmu__scan_file_at(intel_pt_pmu, dirfd, supported, "%d", &ok) == 1 && !ok)
valid = 0;
valid |= 1;
@@ -531,37 +535,45 @@ static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
struct evsel *evsel)
{
- int err;
+ int err, dirfd;
char c;
if (!evsel)
return 0;
+ dirfd = perf_pmu__event_source_devices_fd();
+ if (dirfd < 0)
+ return dirfd;
+
/*
* If supported, force pass-through config term (pt=1) even if user
* sets pt=0, which avoids senseless kernel errors.
*/
- if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
+ if (perf_pmu__scan_file_at(intel_pt_pmu, dirfd, "format/pt", "%c", &c) == 1 &&
!(evsel->core.attr.config & 1)) {
pr_warning("pt=0 doesn't make sense, forcing pt=1\n");
evsel->core.attr.config |= 1;
}
- err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds",
+ err = intel_pt_val_config_term(intel_pt_pmu, dirfd, "caps/cycle_thresholds",
"cyc_thresh", "caps/psb_cyc",
evsel->core.attr.config);
if (err)
- return err;
+ goto out;
- err = intel_pt_val_config_term(intel_pt_pmu, "caps/mtc_periods",
+ err = intel_pt_val_config_term(intel_pt_pmu, dirfd, "caps/mtc_periods",
"mtc_period", "caps/mtc",
evsel->core.attr.config);
if (err)
- return err;
+ goto out;
- return intel_pt_val_config_term(intel_pt_pmu, "caps/psb_periods",
+ err = intel_pt_val_config_term(intel_pt_pmu, dirfd, "caps/psb_periods",
"psb_period", "caps/psb_cyc",
evsel->core.attr.config);
+
+out:
+ close(dirfd);
+ return err;
}
static void intel_pt_config_sample_mode(struct perf_pmu *intel_pt_pmu,
--
2.40.0.348.gf938b09366-goog
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