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Date: Fri, 9 Dec 2016 11:59:54 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Joe Stringer <joe@....org>
Cc: linux-kernel@...r.kernel.org, wangnan0@...wei.com, ast@...com,
daniel@...earbox.net, netdev@...r.kernel.org
Subject: Re: [PATCHv3 perf/core 6/7] samples/bpf: Remove perf_event_open()
declaration
Em Thu, Dec 08, 2016 at 06:46:19PM -0800, Joe Stringer escreveu:
> This declaration was made in samples/bpf/libbpf.c for convenience, but
> there's already one in tools/perf/perf-sys.h. Reuse that one.
>
> Signed-off-by: Joe Stringer <joe@....org>
> ---
> v3: First post.
> ---
> samples/bpf/Makefile | 3 ++-
> samples/bpf/bpf_load.c | 3 ++-
> samples/bpf/libbpf.c | 7 -------
> samples/bpf/libbpf.h | 3 ---
> samples/bpf/sampleip_user.c | 3 ++-
> samples/bpf/trace_event_user.c | 9 +++++----
> samples/bpf/trace_output_user.c | 3 ++-
> samples/bpf/tracex6_user.c | 3 ++-
> 8 files changed, 15 insertions(+), 19 deletions(-)
>
> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
> index c8f7ed37b2de..0adc47e67e65 100644
> --- a/samples/bpf/Makefile
> +++ b/samples/bpf/Makefile
> @@ -92,7 +92,8 @@ always += test_current_task_under_cgroup_kern.o
> always += trace_event_kern.o
> always += sampleip_kern.o
>
> -HOSTCFLAGS += -I$(objtree)/usr/include -I$(objtree)/tools/lib/
> +HOSTCFLAGS += -I$(objtree)/usr/include -I$(objtree)/tools/lib/ \
> + -I$(objtree)/tools/include -I$(objtree)/tools/perf
Switching these to $(srctree) as well, to support building it like:
make -j4 O=../build/v4.9.0-rc8+ samples/bpf/
>
> HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
> HOSTLOADLIBES_fds_example += -lelf
> diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
> index f8e3c58a0897..d683bd278171 100644
> --- a/samples/bpf/bpf_load.c
> +++ b/samples/bpf/bpf_load.c
> @@ -19,6 +19,7 @@
> #include <ctype.h>
> #include "libbpf.h"
> #include "bpf_load.h"
> +#include "perf-sys.h"
>
> #define DEBUGFS "/sys/kernel/debug/tracing/"
>
> @@ -168,7 +169,7 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
> id = atoi(buf);
> attr.config = id;
>
> - efd = perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
> + efd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
> if (efd < 0) {
> printf("event %d fd %d err %s\n", id, efd, strerror(errno));
> return -1;
> diff --git a/samples/bpf/libbpf.c b/samples/bpf/libbpf.c
> index d9af876b4a2c..bee473a494f1 100644
> --- a/samples/bpf/libbpf.c
> +++ b/samples/bpf/libbpf.c
> @@ -34,10 +34,3 @@ int open_raw_sock(const char *name)
>
> return sock;
> }
> -
> -int perf_event_open(struct perf_event_attr *attr, int pid, int cpu,
> - int group_fd, unsigned long flags)
> -{
> - return syscall(__NR_perf_event_open, attr, pid, cpu,
> - group_fd, flags);
> -}
> diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h
> index cc815624aacf..09aedc320009 100644
> --- a/samples/bpf/libbpf.h
> +++ b/samples/bpf/libbpf.h
> @@ -188,7 +188,4 @@ struct bpf_insn;
> /* create RAW socket and bind to interface 'name' */
> int open_raw_sock(const char *name);
>
> -struct perf_event_attr;
> -int perf_event_open(struct perf_event_attr *attr, int pid, int cpu,
> - int group_fd, unsigned long flags);
> #endif
> diff --git a/samples/bpf/sampleip_user.c b/samples/bpf/sampleip_user.c
> index 09ab620b324c..476a11947180 100644
> --- a/samples/bpf/sampleip_user.c
> +++ b/samples/bpf/sampleip_user.c
> @@ -21,6 +21,7 @@
> #include <sys/ioctl.h>
> #include "libbpf.h"
> #include "bpf_load.h"
> +#include "perf-sys.h"
>
> #define DEFAULT_FREQ 99
> #define DEFAULT_SECS 5
> @@ -50,7 +51,7 @@ static int sampling_start(int *pmu_fd, int freq)
> };
>
> for (i = 0; i < nr_cpus; i++) {
> - pmu_fd[i] = perf_event_open(&pe_sample_attr, -1 /* pid */, i,
> + pmu_fd[i] = sys_perf_event_open(&pe_sample_attr, -1 /* pid */, i,
> -1 /* group_fd */, 0 /* flags */);
> if (pmu_fd[i] < 0) {
> fprintf(stderr, "ERROR: Initializing perf sampling\n");
> diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c
> index de8fd0266d78..ccb0cba8324a 100644
> --- a/samples/bpf/trace_event_user.c
> +++ b/samples/bpf/trace_event_user.c
> @@ -20,6 +20,7 @@
> #include <sys/resource.h>
> #include "libbpf.h"
> #include "bpf_load.h"
> +#include "perf-sys.h"
>
> #define SAMPLE_FREQ 50
>
> @@ -126,9 +127,9 @@ static void test_perf_event_all_cpu(struct perf_event_attr *attr)
>
> /* open perf_event on all cpus */
> for (i = 0; i < nr_cpus; i++) {
> - pmu_fd[i] = perf_event_open(attr, -1, i, -1, 0);
> + pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
> if (pmu_fd[i] < 0) {
> - printf("perf_event_open failed\n");
> + printf("sys_perf_event_open failed\n");
> goto all_cpu_err;
> }
> assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
> @@ -147,9 +148,9 @@ static void test_perf_event_task(struct perf_event_attr *attr)
> int pmu_fd;
>
> /* open task bound event */
> - pmu_fd = perf_event_open(attr, 0, -1, -1, 0);
> + pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0);
> if (pmu_fd < 0) {
> - printf("perf_event_open failed\n");
> + printf("sys_perf_event_open failed\n");
> return;
> }
> assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
> diff --git a/samples/bpf/trace_output_user.c b/samples/bpf/trace_output_user.c
> index 9c38f7aa4515..64e692fd7d51 100644
> --- a/samples/bpf/trace_output_user.c
> +++ b/samples/bpf/trace_output_user.c
> @@ -21,6 +21,7 @@
> #include <signal.h>
> #include "libbpf.h"
> #include "bpf_load.h"
> +#include "perf-sys.h"
>
> static int pmu_fd;
>
> @@ -160,7 +161,7 @@ static void test_bpf_perf_event(void)
> };
> int key = 0;
>
> - pmu_fd = perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
> + pmu_fd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
>
> assert(pmu_fd >= 0);
> assert(bpf_map_update_elem(map_fd[0], &key, &pmu_fd, BPF_ANY) == 0);
> diff --git a/samples/bpf/tracex6_user.c b/samples/bpf/tracex6_user.c
> index 7a3b4a4b19f3..1681cb7cd713 100644
> --- a/samples/bpf/tracex6_user.c
> +++ b/samples/bpf/tracex6_user.c
> @@ -10,6 +10,7 @@
> #include <linux/bpf.h>
> #include "libbpf.h"
> #include "bpf_load.h"
> +#include "perf-sys.h"
>
> #define SAMPLE_PERIOD 0x7fffffffffffffffULL
>
> @@ -32,7 +33,7 @@ static void test_bpf_perf_event(void)
> };
>
> for (i = 0; i < nr_cpus; i++) {
> - pmu_fd[i] = perf_event_open(&attr_insn_pmu, -1/*pid*/, i/*cpu*/, -1/*group_fd*/, 0);
> + pmu_fd[i] = sys_perf_event_open(&attr_insn_pmu, -1/*pid*/, i/*cpu*/, -1/*group_fd*/, 0);
> if (pmu_fd[i] < 0) {
> printf("event syscall failed\n");
> goto exit;
> --
> 2.10.2
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