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authorSong Liu <song@kernel.org>2021-04-26 00:43:29 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-04-29 16:30:58 +0300
commitec8149fba64b719a618b432ce9eea7ce937a523c (patch)
treea60350296d16034b7ddabc4fe43d6f84727664f5 /tools/perf/util
parent26bda3ca19c5a775e4a8c2d4136d83a1327e4a66 (diff)
downloadlinux-ec8149fba64b719a618b432ce9eea7ce937a523c.tar.xz
perf util: Move bpf_perf definitions to a libperf header
By following the same protocol, other tools can share hardware PMCs with perf. Move perf_event_attr_map_entry and BPF_PERF_DEFAULT_ATTR_MAP_PATH to bpf_perf.h for other tools to use. Signed-off-by: Song Liu <song@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Song Liu <songliubraving@fb.com> Cc: kernel-team@fb.com Link: https://lore.kernel.org/r/20210425214333.1090950-2-song@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util')
-rw-r--r--tools/perf/util/bpf_counter.c27
1 files changed, 3 insertions, 24 deletions
diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
index 81d1df3c4ec0..be484ddbbd5b 100644
--- a/tools/perf/util/bpf_counter.c
+++ b/tools/perf/util/bpf_counter.c
@@ -14,6 +14,7 @@
#include <bpf/btf.h>
#include <bpf/libbpf.h>
#include <api/fs/fs.h>
+#include <perf/bpf_perf.h>
#include "bpf_counter.h"
#include "counts.h"
@@ -29,28 +30,6 @@
#include "bpf_skel/bperf_leader.skel.h"
#include "bpf_skel/bperf_follower.skel.h"
-/*
- * bperf uses a hashmap, the attr_map, to track all the leader programs.
- * The hashmap is pinned in bpffs. flock() on this file is used to ensure
- * no concurrent access to the attr_map. The key of attr_map is struct
- * perf_event_attr, and the value is struct perf_event_attr_map_entry.
- *
- * struct perf_event_attr_map_entry contains two __u32 IDs, bpf_link of the
- * leader prog, and the diff_map. Each perf-stat session holds a reference
- * to the bpf_link to make sure the leader prog is attached to sched_switch
- * tracepoint.
- *
- * Since the hashmap only contains IDs of the bpf_link and diff_map, it
- * does not hold any references to the leader program. Once all perf-stat
- * sessions of these events exit, the leader prog, its maps, and the
- * perf_events will be freed.
- */
-struct perf_event_attr_map_entry {
- __u32 link_id;
- __u32 diff_map_id;
-};
-
-#define DEFAULT_ATTR_MAP_PATH "fs/bpf/perf_attr_map"
#define ATTR_MAP_SIZE 16
static inline void *u64_to_ptr(__u64 ptr)
@@ -341,8 +320,8 @@ static int bperf_lock_attr_map(struct target *target)
if (target->attr_map) {
scnprintf(path, PATH_MAX, "%s", target->attr_map);
} else {
- scnprintf(path, PATH_MAX, "%s/%s", sysfs__mountpoint(),
- DEFAULT_ATTR_MAP_PATH);
+ scnprintf(path, PATH_MAX, "%s/fs/bpf/%s", sysfs__mountpoint(),
+ BPF_PERF_DEFAULT_ATTR_MAP_PATH);
}
if (access(path, F_OK)) {