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Date: Fri, 22 Apr 2022 18:38:29 +0900
From: Shunsuke Nakamura <nakamura.shun@...itsu.com>
To: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
mark.rutland@....com, alexander.shishkin@...ux.intel.com,
jolsa@...hat.com, namhyung@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH 3/7] libperf: Add support for overflow handling of sampling events
Extend the fields of the opts structure to set up overflow handling
for sampling events. Also, add processing to set signal handlers in
perf_evsel__open_opts.
Signed-off-by: Shunsuke Nakamura <nakamura.shun@...itsu.com>
---
tools/lib/perf/Documentation/libperf.txt | 6 +-
tools/lib/perf/Makefile | 1 +
tools/lib/perf/evsel.c | 79 ++++++++++++++++++++++++
tools/lib/perf/include/perf/evsel.h | 6 +-
tools/lib/perf/tests/test-evlist.c | 1 -
5 files changed, 90 insertions(+), 3 deletions(-)
diff --git a/tools/lib/perf/Documentation/libperf.txt b/tools/lib/perf/Documentation/libperf.txt
index 6ca91ca94e01..ec93b1c75ebe 100644
--- a/tools/lib/perf/Documentation/libperf.txt
+++ b/tools/lib/perf/Documentation/libperf.txt
@@ -137,8 +137,12 @@ SYNOPSIS
size_t sz;
unsigned long open_flags; /* perf_event_open flags */
+ int flags; /* fcntl flags */
+ unsigned int signal;
+ int owner_type;
+ struct sigaction *sig;
};
- #define perf_evsel_open_opts__last_field open_flags
+ #define perf_evsel_open_opts__last_field sig
#define LIBPERF_OPTS(TYPE, NAME, ...)
diff --git a/tools/lib/perf/Makefile b/tools/lib/perf/Makefile
index 21df023a2103..4c8fae193cf5 100644
--- a/tools/lib/perf/Makefile
+++ b/tools/lib/perf/Makefile
@@ -75,6 +75,7 @@ override CFLAGS += -Werror -Wall
override CFLAGS += -fPIC
override CFLAGS += $(INCLUDES)
override CFLAGS += -fvisibility=hidden
+override CFLAGS += -D_GNU_SOURCE
all:
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
index 00c0cea43b52..a289f6c44d7c 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -460,6 +460,79 @@ void perf_counts_values__scale(struct perf_counts_values *count,
*pscaled = scaled;
}
+static int perf_evsel__run_fcntl(struct perf_evsel *evsel,
+ unsigned int cmd, unsigned long arg,
+ int cpu_map_idx)
+{
+ int thread;
+
+ for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
+ int err;
+ int *fd = FD(evsel, cpu_map_idx, thread);
+
+ if (!fd || *fd < 0)
+ return -1;
+
+ err = fcntl(*fd, cmd, arg);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int perf_evsel__set_signal_handler(struct perf_evsel *evsel,
+ struct perf_evsel_open_opts *opts)
+{
+ unsigned int flags;
+ unsigned int signal;
+ struct f_owner_ex owner;
+ struct sigaction *sig;
+ int cpu_map_idx;
+ int err = 0;
+
+ flags = OPTS_GET(opts, flags, (O_RDWR | O_NONBLOCK | O_ASYNC));
+ signal = OPTS_GET(opts, signal, SIGIO);
+ owner.type = OPTS_GET(opts, owner_type, F_OWNER_PID);
+ sig = OPTS_GET(opts, sig, NULL);
+
+ if (flags == 0 && signal == 0 && !owner.type == 0 && sig == 0)
+ return err;
+
+ err = sigaction(signal, sig, NULL);
+ if (err)
+ return err;
+
+ switch (owner.type) {
+ case F_OWNER_PID:
+ owner.pid = getpid();
+ break;
+ case F_OWNER_TID:
+ owner.pid = syscall(SYS_gettid);
+ break;
+ case F_OWNER_PGRP:
+ default:
+ return -1;
+ }
+
+ for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->fd); cpu_map_idx++) {
+ err = perf_evsel__run_fcntl(evsel, F_SETFL, flags, cpu_map_idx);
+ if (err)
+ return err;
+
+ err = perf_evsel__run_fcntl(evsel, F_SETSIG, signal, cpu_map_idx);
+ if (err)
+ return err;
+
+ err = perf_evsel__run_fcntl(evsel, F_SETOWN_EX,
+ (unsigned long)&owner, cpu_map_idx);
+ if (err)
+ return err;
+ }
+
+ return err;
+}
+
int perf_evsel__open_opts(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
struct perf_thread_map *threads,
struct perf_evsel_open_opts *opts)
@@ -474,6 +547,12 @@ int perf_evsel__open_opts(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
evsel->open_flags = OPTS_GET(opts, open_flags, 0);
err = perf_evsel__open(evsel, cpus, threads);
+ if (err)
+ return err;
+
+ err = perf_evsel__set_signal_handler(evsel, opts);
+ if (err)
+ return err;
return err;
}
diff --git a/tools/lib/perf/include/perf/evsel.h b/tools/lib/perf/include/perf/evsel.h
index 1140df4d2578..50662babfe97 100644
--- a/tools/lib/perf/include/perf/evsel.h
+++ b/tools/lib/perf/include/perf/evsel.h
@@ -29,8 +29,12 @@ struct perf_evsel_open_opts {
size_t sz;
unsigned long open_flags; /* perf_event_open flags */
+ int flags; /* fcntl flags */
+ unsigned int signal;
+ int owner_type;
+ struct sigaction *sig;
};
-#define perf_evsel_open_opts__last_field open_flags
+#define perf_evsel_open_opts__last_field sig
#define LIBPERF_OPTS(TYPE, NAME, ...) \
struct TYPE NAME = ({ \
diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c
index ed616fc19b4f..d8f9493cd4d1 100644
--- a/tools/lib/perf/tests/test-evlist.c
+++ b/tools/lib/perf/tests/test-evlist.c
@@ -1,5 +1,4 @@
// SPDX-License-Identifier: GPL-2.0
-#define _GNU_SOURCE // needed for sched.h to get sched_[gs]etaffinity and CPU_(ZERO,SET)
#include <inttypes.h>
#include <sched.h>
#include <stdio.h>
--
2.25.1
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