From: Andi Kleen <andi@firstfloor.org>
To: acme@kernel.org
Cc: linux-kernel@vger.kernel.org, jolsa@kernel.org,
eranian@google.com, kan.liang@linux.intel.com,
peterz@infradead.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH v2 6/9] perf stat: Use affinity for closing file descriptors
Date: Sun, 20 Oct 2019 10:51:59 -0700 [thread overview]
Message-ID: <20191020175202.32456-7-andi@firstfloor.org> (raw)
In-Reply-To: <20191020175202.32456-1-andi@firstfloor.org>
From: Andi Kleen <ak@linux.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@linux.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.h | 1 +
4 files changed, 52 insertions(+), 8 deletions(-)
diff --git a/tools/perf/lib/evsel.c b/tools/perf/lib/evsel.c
index 5a89857b0381..ea775dacbd2d 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 27b4b958eddd..b1b29d473a9f 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -18,6 +18,7 @@
#include "debug.h"
#include "units.h"
#include <internal/lib.h> // page_size
+#include "affinity.h"
#include "../perf.h"
#include "asm/bug.h"
#include "bpf-event.h"
@@ -1174,9 +1175,35 @@ 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->core);
+ }
}
static int perf_evlist__create_syswide_maps(struct evlist *evlist)
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index cf90019ae744..2e3b011ed09e 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -391,4 +391,5 @@ static inline bool evsel__has_callchain(const struct evsel *evsel)
struct perf_env *perf_evsel__env(struct evsel *evsel);
int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
+
#endif /* __PERF_EVSEL_H */
--
2.21.0
next prev parent reply other threads:[~2019-10-20 17:52 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-20 17:51 Optimize perf stat for large number of events/cpus v2 Andi Kleen
2019-10-20 17:51 ` [PATCH v2 1/9] perf evsel: Always preserve errno while cleaning up perf_event_open failures Andi Kleen
2019-10-22 8:01 ` Jiri Olsa
2019-11-12 11:18 ` [tip: perf/core] " tip-bot2 for Andi Kleen
2019-10-20 17:51 ` [PATCH v2 2/9] perf evsel: Avoid close(-1) Andi Kleen
2019-10-22 8:01 ` Jiri Olsa
2019-11-12 11:18 ` [tip: perf/core] " tip-bot2 for Andi Kleen
2019-10-20 17:51 ` [PATCH v2 3/9] perf pmu: Use file system cache to optimize sysfs access Andi Kleen
2019-10-23 9:47 ` Jiri Olsa
2019-10-20 17:51 ` [PATCH v2 4/9] perf affinity: Add infrastructure to save/restore affinity Andi Kleen
2019-10-23 9:59 ` Jiri Olsa
2019-10-23 13:02 ` Andi Kleen
2019-10-23 14:30 ` Jiri Olsa
2019-10-23 14:52 ` Andi Kleen
2019-10-23 16:16 ` Alexey Budankov
2019-10-23 17:19 ` Andi Kleen
2019-10-23 18:08 ` Alexey Budankov
2019-10-23 22:37 ` Andi Kleen
2019-10-24 8:46 ` Alexey Budankov
2019-10-20 17:51 ` [PATCH v2 5/9] perf evsel: Add iterator to iterate over events ordered by CPU Andi Kleen
2019-10-20 17:51 ` Andi Kleen [this message]
2019-10-20 17:52 ` [PATCH v2 7/9] perf stat: Use affinity for opening events Andi Kleen
2019-10-20 17:52 ` [PATCH v2 8/9] perf stat: Use affinity for reading Andi Kleen
2019-10-20 17:52 ` [PATCH v2 9/9] perf stat: Use affinity for enabling/disabling events Andi Kleen
2019-10-23 10:30 ` Jiri Olsa
2019-10-23 13:07 ` Andi Kleen
2019-10-22 8:02 ` Optimize perf stat for large number of events/cpus v2 Jiri Olsa
2019-10-22 14:11 ` Arnaldo Carvalho de Melo
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