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authorJiri Olsa <jolsa@kernel.org>2019-10-17 12:59:09 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-10-19 15:35:01 -0300
commit6eb65f7a5cc553f5dffb5cea3a874f1087524d99 (patch)
tree0a51ce3888aae612aeba90891f78c261fc0c361c /tools
parent6a5f3d94cb69a185b921cb92c39888dc31009acb (diff)
libperf: Introduce perf_evlist__for_each_mmap()
Add the perf_evlist__for_each_mmap() function and export it in the perf/evlist.h header, so that the user can iterate through 'struct perf_mmap' objects. Add a internal perf_mmap__link() function to do the actual linking. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexey Budankov <alexey.budankov@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/20191017105918.20873-2-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/lib/evlist.c26
-rw-r--r--tools/perf/lib/include/internal/evlist.h2
-rw-r--r--tools/perf/lib/include/internal/mmap.h5
-rw-r--r--tools/perf/lib/include/perf/evlist.h9
-rw-r--r--tools/perf/lib/libperf.map1
-rw-r--r--tools/perf/lib/mmap.c6
-rw-r--r--tools/perf/util/evlist.c4
7 files changed, 47 insertions, 6 deletions
diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index 65045614c938..854efff1519d 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -347,6 +347,8 @@ static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, boo
return NULL;
for (i = 0; i < evlist->nr_mmaps; i++) {
+ struct perf_mmap *prev = i ? &map[i - 1] : NULL;
+
/*
* When the perf_mmap() call is made we grab one refcount, plus
* one extra to let perf_mmap__consume() get the last
@@ -356,7 +358,7 @@ static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, boo
* Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
* thus does perf_mmap__get() on it.
*/
- perf_mmap__init(&map[i], overwrite, NULL);
+ perf_mmap__init(&map[i], prev, overwrite, NULL);
}
return map;
@@ -405,6 +407,15 @@ perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
return perf_mmap__mmap(map, mp, output, cpu);
}
+static void perf_evlist__set_mmap_first(struct perf_evlist *evlist, struct perf_mmap *map,
+ bool overwrite)
+{
+ if (overwrite)
+ evlist->mmap_ovw_first = map;
+ else
+ evlist->mmap_first = map;
+}
+
static int
mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
int idx, struct perf_mmap_param *mp, int cpu_idx,
@@ -460,6 +471,9 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
return -1;
+
+ if (!idx)
+ perf_evlist__set_mmap_first(evlist, map, overwrite);
} else {
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
return -1;
@@ -605,3 +619,13 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
zfree(&evlist->mmap);
zfree(&evlist->mmap_ovw);
}
+
+struct perf_mmap*
+perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map,
+ bool overwrite)
+{
+ if (map)
+ return map->next;
+
+ return overwrite ? evlist->mmap_ovw_first : evlist->mmap_first;
+}
diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h
index be0b25a70730..20d90e29fc0e 100644
--- a/tools/perf/lib/include/internal/evlist.h
+++ b/tools/perf/lib/include/internal/evlist.h
@@ -25,6 +25,8 @@ struct perf_evlist {
struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
struct perf_mmap *mmap;
struct perf_mmap *mmap_ovw;
+ struct perf_mmap *mmap_first;
+ struct perf_mmap *mmap_ovw_first;
};
typedef void
diff --git a/tools/perf/lib/include/internal/mmap.h b/tools/perf/lib/include/internal/mmap.h
index ee536c4441bb..be7556e0a2b2 100644
--- a/tools/perf/lib/include/internal/mmap.h
+++ b/tools/perf/lib/include/internal/mmap.h
@@ -32,6 +32,7 @@ struct perf_mmap {
u64 flush;
libperf_unmap_cb_t unmap_cb;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
+ struct perf_mmap *next;
};
struct perf_mmap_param {
@@ -41,8 +42,8 @@ struct perf_mmap_param {
size_t perf_mmap__mmap_len(struct perf_mmap *map);
-void perf_mmap__init(struct perf_mmap *map, bool overwrite,
- libperf_unmap_cb_t unmap_cb);
+void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
+ bool overwrite, libperf_unmap_cb_t unmap_cb);
int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
int fd, int cpu);
void perf_mmap__munmap(struct perf_mmap *map);
diff --git a/tools/perf/lib/include/perf/evlist.h b/tools/perf/lib/include/perf/evlist.h
index 16f526e74d13..8c4b3c28535e 100644
--- a/tools/perf/lib/include/perf/evlist.h
+++ b/tools/perf/lib/include/perf/evlist.h
@@ -3,6 +3,7 @@
#define __LIBPERF_EVLIST_H
#include <perf/core.h>
+#include <stdbool.h>
struct perf_evlist;
struct perf_evsel;
@@ -38,4 +39,12 @@ LIBPERF_API int perf_evlist__filter_pollfd(struct perf_evlist *evlist,
LIBPERF_API int perf_evlist__mmap(struct perf_evlist *evlist, int pages);
LIBPERF_API void perf_evlist__munmap(struct perf_evlist *evlist);
+LIBPERF_API struct perf_mmap *perf_evlist__next_mmap(struct perf_evlist *evlist,
+ struct perf_mmap *map,
+ bool overwrite);
+#define perf_evlist__for_each_mmap(evlist, pos, overwrite) \
+ for ((pos) = perf_evlist__next_mmap((evlist), NULL, overwrite); \
+ (pos) != NULL; \
+ (pos) = perf_evlist__next_mmap((evlist), (pos), overwrite))
+
#endif /* __LIBPERF_EVLIST_H */
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
index 2184aba36c3f..8be02afc324b 100644
--- a/tools/perf/lib/libperf.map
+++ b/tools/perf/lib/libperf.map
@@ -43,6 +43,7 @@ LIBPERF_0.0.1 {
perf_evlist__mmap;
perf_evlist__munmap;
perf_evlist__filter_pollfd;
+ perf_evlist__next_mmap;
perf_mmap__consume;
perf_mmap__read_init;
perf_mmap__read_done;
diff --git a/tools/perf/lib/mmap.c b/tools/perf/lib/mmap.c
index 0752c193b0fb..79d5ed6c38cc 100644
--- a/tools/perf/lib/mmap.c
+++ b/tools/perf/lib/mmap.c
@@ -13,13 +13,15 @@
#include <linux/kernel.h>
#include "internal.h"
-void perf_mmap__init(struct perf_mmap *map, bool overwrite,
- libperf_unmap_cb_t unmap_cb)
+void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
+ bool overwrite, libperf_unmap_cb_t unmap_cb)
{
map->fd = -1;
map->overwrite = overwrite;
map->unmap_cb = unmap_cb;
refcount_set(&map->refcnt, 0);
+ if (prev)
+ prev->next = map;
}
size_t perf_mmap__mmap_len(struct perf_mmap *map)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 0f9cd703e725..6cda5a311ba5 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -607,6 +607,8 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
return NULL;
for (i = 0; i < evlist->core.nr_mmaps; i++) {
+ struct perf_mmap *prev = i ? &map[i - 1].core : NULL;
+
/*
* When the perf_mmap() call is made we grab one refcount, plus
* one extra to let perf_mmap__consume() get the last
@@ -616,7 +618,7 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
* Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
* thus does perf_mmap__get() on it.
*/
- perf_mmap__init(&map[i].core, overwrite, perf_mmap__unmap_cb);
+ perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb);
}
return map;