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Message-Id: <20191020161346.18938-7-andi@firstfloor.org>
Date: Sun, 20 Oct 2019 09:13:43 -0700
From: Andi Kleen <andi@...stfloor.org>
To: acme@...nel.org
Cc: jolsa@...nel.org, eranian@...gle.com, kan.liang@...ux.intel.com,
peterz@...radead.org, linux-kernel@...r.kernel.org,
Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 6/9] perf stat: Use affinity for closing file descriptors
From: Andi Kleen <ak@...ux.intel.com>
Closing a perf fd can also trigger an IPI to the target CPU.
Use the same affinity technique as we use for reading/enabling events
to closing to optimize the CPU transitions.
Before on a large test case with 94 CPUs:
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
32.56 3.085463 50 61483 close
After:
10.54 0.735704 11 61485 close
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
tools/perf/lib/evsel.c | 27 +++++++++++++++++++------
tools/perf/lib/include/perf/evsel.h | 1 +
tools/perf/util/evlist.c | 31 +++++++++++++++++++++++++++--
tools/perf/util/evsel.c | 2 +-
tools/perf/util/evsel.h | 2 ++
5 files changed, 54 insertions(+), 9 deletions(-)
diff --git a/tools/perf/lib/evsel.c b/tools/perf/lib/evsel.c
index 106522305ed0..5d23bf09e486 100644
--- a/tools/perf/lib/evsel.c
+++ b/tools/perf/lib/evsel.c
@@ -114,16 +114,23 @@ int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
return err;
}
+static void perf_evsel__close_fd_cpu(struct perf_evsel *evsel, int cpu)
+{
+ int thread;
+
+ for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
+ if (FD(evsel, cpu, thread) >= 0)
+ close(FD(evsel, cpu, thread));
+ FD(evsel, cpu, thread) = -1;
+ }
+}
+
void perf_evsel__close_fd(struct perf_evsel *evsel)
{
- int cpu, thread;
+ int cpu;
for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
- for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
- if (FD(evsel, cpu, thread) >= 0)
- close(FD(evsel, cpu, thread));
- FD(evsel, cpu, thread) = -1;
- }
+ perf_evsel__close_fd_cpu(evsel, cpu);
}
void perf_evsel__free_fd(struct perf_evsel *evsel)
@@ -141,6 +148,14 @@ void perf_evsel__close(struct perf_evsel *evsel)
perf_evsel__free_fd(evsel);
}
+void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu)
+{
+ if (evsel->fd == NULL)
+ return;
+
+ perf_evsel__close_fd_cpu(evsel, cpu);
+}
+
int perf_evsel__read_size(struct perf_evsel *evsel)
{
u64 read_format = evsel->attr.read_format;
diff --git a/tools/perf/lib/include/perf/evsel.h b/tools/perf/lib/include/perf/evsel.h
index 4388667f265c..ed10a914cd3f 100644
--- a/tools/perf/lib/include/perf/evsel.h
+++ b/tools/perf/lib/include/perf/evsel.h
@@ -28,6 +28,7 @@ LIBPERF_API void perf_evsel__delete(struct perf_evsel *evsel);
LIBPERF_API int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
struct perf_thread_map *threads);
LIBPERF_API void perf_evsel__close(struct perf_evsel *evsel);
+LIBPERF_API void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu);
LIBPERF_API int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
struct perf_counts_values *count);
LIBPERF_API int perf_evsel__enable(struct perf_evsel *evsel);
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 00eaa6c5cdbe..f36f7eb64091 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -17,6 +17,7 @@
#include "debug.h"
#include "units.h"
#include "util.h"
+#include "affinity.h"
#include "../perf.h"
#include "asm/bug.h"
#include "bpf-event.h"
@@ -1342,9 +1343,35 @@ void perf_evlist__set_selected(struct evlist *evlist,
void evlist__close(struct evlist *evlist)
{
struct evsel *evsel;
+ struct affinity affinity;
+ struct perf_cpu_map *cpus;
+ int i;
+
+ /* So far record doesn't set this up */
+ if (!evlist->core.cpus) {
+ evlist__for_each_entry_reverse(evlist, evsel)
+ evsel__close(evsel);
+ return;
+ }
- evlist__for_each_entry_reverse(evlist, evsel)
- evsel__close(evsel);
+ if (affinity__setup(&affinity) < 0)
+ return;
+ cpus = evlist__cpu_iter_start(evlist);
+ for (i = 0; i < cpus->nr; i++) {
+ int cpu = cpus->map[i];
+ affinity__set(&affinity, cpu);
+
+ evlist__for_each_entry_reverse(evlist, evsel) {
+ if (evlist__cpu_iter_skip(evsel, cpu))
+ continue;
+ perf_evsel__close_cpu(&evsel->core, evsel->cpu_index);
+ evlist__cpu_iter_next(evsel);
+ }
+ }
+ evlist__for_each_entry_reverse(evlist, evsel) {
+ perf_evsel__free_fd(&evsel->core);
+ perf_evsel__free_id(evsel);
+ }
}
static int perf_evlist__create_syswide_maps(struct evlist *evlist)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index bc57ac5d51a0..8cdf7c3d5f31 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1248,7 +1248,7 @@ int perf_evsel__alloc_id(struct evsel *evsel, int ncpus, int nthreads)
return 0;
}
-static void perf_evsel__free_id(struct evsel *evsel)
+void perf_evsel__free_id(struct evsel *evsel)
{
xyarray__delete(evsel->sample_id);
evsel->sample_id = NULL;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 227320501eb8..169bb896caf3 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -511,4 +511,6 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
struct perf_env *perf_evsel__env(struct evsel *evsel);
int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
+void perf_evsel__free_id(struct evsel *evsel);
+
#endif /* __PERF_EVSEL_H */
--
2.21.0
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