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-rw-r--r--tools/perf/util/evlist.c27
-rw-r--r--tools/perf/util/evlist.h9
-rw-r--r--tools/perf/util/evsel.c160
-rw-r--r--tools/perf/util/evsel.h26
4 files changed, 173 insertions, 49 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 6d4129214ee8..deb82a4fc312 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -3,11 +3,18 @@
#include "evsel.h"
#include "util.h"
+#include <linux/bitops.h>
+#include <linux/hash.h>
+
struct perf_evlist *perf_evlist__new(void)
{
struct perf_evlist *evlist = zalloc(sizeof(*evlist));
if (evlist != NULL) {
+ int i;
+
+ for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
+ INIT_HLIST_HEAD(&evlist->heads[i]);
INIT_LIST_HEAD(&evlist->entries);
}
@@ -29,6 +36,7 @@ static void perf_evlist__purge(struct perf_evlist *evlist)
void perf_evlist__delete(struct perf_evlist *evlist)
{
perf_evlist__purge(evlist);
+ free(evlist->mmap);
free(evlist->pollfd);
free(evlist);
}
@@ -68,3 +76,22 @@ void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
evlist->pollfd[evlist->nr_fds].events = POLLIN;
evlist->nr_fds++;
}
+
+struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
+{
+ struct hlist_head *head;
+ struct hlist_node *pos;
+ struct perf_sample_id *sid;
+ int hash;
+
+ if (evlist->nr_entries == 1)
+ return list_entry(evlist->entries.next, struct perf_evsel, node);
+
+ hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
+ head = &evlist->heads[hash];
+
+ hlist_for_each_entry(sid, pos, head, node)
+ if (sid->id == id)
+ return sid->evsel;
+ return NULL;
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 16bbfcba8ca8..dbfcc79bb995 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -2,13 +2,20 @@
#define __PERF_EVLIST_H 1
#include <linux/list.h>
+#include "../perf.h"
struct pollfd;
+#define PERF_EVLIST__HLIST_BITS 8
+#define PERF_EVLIST__HLIST_SIZE (1 << PERF_EVLIST__HLIST_BITS)
+
struct perf_evlist {
struct list_head entries;
+ struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
int nr_entries;
int nr_fds;
+ int mmap_len;
+ struct perf_mmap *mmap;
struct pollfd *pollfd;
};
@@ -23,4 +30,6 @@ int perf_evlist__add_default(struct perf_evlist *evlist);
int perf_evlist__alloc_pollfd(struct perf_evlist *evlist, int ncpus, int nthreads);
void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd);
+struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
+
#endif /* __PERF_EVLIST_H */
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index f5006958f8da..ee490356c817 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -8,7 +8,11 @@
#include <unistd.h>
#include <sys/mman.h>
+#include <linux/bitops.h>
+#include <linux/hash.h>
+
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
+#define SID(e, x, y) xyarray__entry(e->id, x, y)
struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
{
@@ -29,6 +33,12 @@ int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
return evsel->fd != NULL ? 0 : -ENOMEM;
}
+int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+ evsel->id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
+ return evsel->id != NULL ? 0 : -ENOMEM;
+}
+
int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
{
evsel->counts = zalloc((sizeof(*evsel->counts) +
@@ -42,6 +52,12 @@ void perf_evsel__free_fd(struct perf_evsel *evsel)
evsel->fd = NULL;
}
+void perf_evsel__free_id(struct perf_evsel *evsel)
+{
+ xyarray__delete(evsel->id);
+ evsel->id = NULL;
+}
+
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
{
int cpu, thread;
@@ -53,32 +69,29 @@ void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
}
}
-void perf_evsel__munmap(struct perf_evsel *evsel, int ncpus, int nthreads)
+void perf_evlist__munmap(struct perf_evlist *evlist, int ncpus)
{
- struct perf_mmap *mm;
- int cpu, thread;
+ int cpu;
- for (cpu = 0; cpu < ncpus; cpu++)
- for (thread = 0; thread < nthreads; ++thread) {
- mm = xyarray__entry(evsel->mmap, cpu, thread);
- if (mm->base != NULL) {
- munmap(mm->base, evsel->mmap_len);
- mm->base = NULL;
- }
+ for (cpu = 0; cpu < ncpus; cpu++) {
+ if (evlist->mmap[cpu].base != NULL) {
+ munmap(evlist->mmap[cpu].base, evlist->mmap_len);
+ evlist->mmap[cpu].base = NULL;
}
+ }
}
-int perf_evsel__alloc_mmap(struct perf_evsel *evsel, int ncpus, int nthreads)
+int perf_evlist__alloc_mmap(struct perf_evlist *evlist, int ncpus)
{
- evsel->mmap = xyarray__new(ncpus, nthreads, sizeof(struct perf_mmap));
- return evsel->mmap != NULL ? 0 : -ENOMEM;
+ evlist->mmap = zalloc(ncpus * sizeof(struct perf_mmap));
+ return evlist->mmap != NULL ? 0 : -ENOMEM;
}
void perf_evsel__delete(struct perf_evsel *evsel)
{
assert(list_empty(&evsel->node));
xyarray__delete(evsel->fd);
- xyarray__delete(evsel->mmap);
+ xyarray__delete(evsel->id);
free(evsel);
}
@@ -235,47 +248,110 @@ int perf_evsel__open_per_thread(struct perf_evsel *evsel,
return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group, inherit);
}
-int perf_evsel__mmap(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, int pages,
- struct perf_evlist *evlist)
+static int __perf_evlist__mmap(struct perf_evlist *evlist, int cpu, int prot,
+ int mask, int fd)
+{
+ evlist->mmap[cpu].prev = 0;
+ evlist->mmap[cpu].mask = mask;
+ evlist->mmap[cpu].base = mmap(NULL, evlist->mmap_len, prot,
+ MAP_SHARED, fd, 0);
+ if (evlist->mmap[cpu].base == MAP_FAILED)
+ return -1;
+
+ perf_evlist__add_pollfd(evlist, fd);
+ return 0;
+}
+
+static int perf_evlist__id_hash(struct perf_evlist *evlist, struct perf_evsel *evsel,
+ int cpu, int thread, int fd)
+{
+ struct perf_sample_id *sid;
+ u64 read_data[4] = { 0, };
+ int hash, id_idx = 1; /* The first entry is the counter value */
+
+ if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
+ read(fd, &read_data, sizeof(read_data)) == -1)
+ return -1;
+
+ if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ ++id_idx;
+ if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ ++id_idx;
+
+ sid = SID(evsel, cpu, thread);
+ sid->id = read_data[id_idx];
+ sid->evsel = evsel;
+ hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
+ hlist_add_head(&sid->node, &evlist->heads[hash]);
+ return 0;
+}
+
+/** perf_evlist__mmap - Create per cpu maps to receive events
+ *
+ * @evlist - list of events
+ * @cpus - cpu map being monitored
+ * @threads - threads map being monitored
+ * @pages - map length in pages
+ * @overwrite - overwrite older events?
+ *
+ * If overwrite is false the user needs to signal event consuption using:
+ *
+ * struct perf_mmap *m = &evlist->mmap[cpu];
+ * unsigned int head = perf_mmap__read_head(m);
+ *
+ * perf_mmap__write_tail(m, head)
+ */
+int perf_evlist__mmap(struct perf_evlist *evlist, struct cpu_map *cpus,
+ struct thread_map *threads, int pages, bool overwrite)
{
unsigned int page_size = sysconf(_SC_PAGE_SIZE);
int mask = pages * page_size - 1, cpu;
- struct perf_mmap *mm;
- int thread;
+ struct perf_evsel *first_evsel, *evsel;
+ int thread, prot = PROT_READ | (overwrite ? 0 : PROT_WRITE);
- if (evsel->mmap == NULL &&
- perf_evsel__alloc_mmap(evsel, cpus->nr, threads->nr) < 0)
+ if (evlist->mmap == NULL &&
+ perf_evlist__alloc_mmap(evlist, cpus->nr) < 0)
return -ENOMEM;
- evsel->mmap_len = (pages + 1) * page_size;
+ if (evlist->pollfd == NULL &&
+ perf_evlist__alloc_pollfd(evlist, cpus->nr, threads->nr) < 0)
+ return -ENOMEM;
- for (cpu = 0; cpu < cpus->nr; cpu++) {
- for (thread = 0; thread < threads->nr; thread++) {
- mm = xyarray__entry(evsel->mmap, cpu, thread);
- mm->prev = 0;
- mm->mask = mask;
- mm->base = mmap(NULL, evsel->mmap_len, PROT_READ,
- MAP_SHARED, FD(evsel, cpu, thread), 0);
- if (mm->base == MAP_FAILED)
- goto out_unmap;
-
- if (evlist != NULL)
- perf_evlist__add_pollfd(evlist, FD(evsel, cpu, thread));
+ evlist->mmap_len = (pages + 1) * page_size;
+ first_evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
+
+ list_for_each_entry(evsel, &evlist->entries, node) {
+ if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
+ evsel->id == NULL &&
+ perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0)
+ return -ENOMEM;
+
+ for (cpu = 0; cpu < cpus->nr; cpu++) {
+ for (thread = 0; thread < threads->nr; thread++) {
+ int fd = FD(evsel, cpu, thread);
+
+ if (evsel->idx || thread) {
+ if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT,
+ FD(first_evsel, cpu, 0)) != 0)
+ goto out_unmap;
+ } else if (__perf_evlist__mmap(evlist, cpu, prot, mask, fd) < 0)
+ goto out_unmap;
+
+ if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
+ perf_evlist__id_hash(evlist, evsel, cpu, thread, fd) < 0)
+ goto out_unmap;
+ }
}
}
return 0;
out_unmap:
- do {
- while (--thread >= 0) {
- mm = xyarray__entry(evsel->mmap, cpu, thread);
- munmap(mm->base, evsel->mmap_len);
- mm->base = NULL;
+ for (cpu = 0; cpu < cpus->nr; cpu++) {
+ if (evlist->mmap[cpu].base != NULL) {
+ munmap(evlist->mmap[cpu].base, evlist->mmap_len);
+ evlist->mmap[cpu].base = NULL;
}
- thread = threads->nr;
- } while (--cpu >= 0);
-
+ }
return -1;
}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index c8fbef299436..667ee4e2e35e 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -24,14 +24,25 @@ struct perf_counts {
struct perf_counts_values cpu[];
};
+struct perf_evsel;
+
+/*
+ * Per fd, to map back from PERF_SAMPLE_ID to evsel, only used when there are
+ * more than one entry in the evlist.
+ */
+struct perf_sample_id {
+ struct hlist_node node;
+ u64 id;
+ struct perf_evsel *evsel;
+};
+
struct perf_evsel {
struct list_head node;
struct perf_event_attr attr;
char *filter;
struct xyarray *fd;
- struct xyarray *mmap;
+ struct xyarray *id;
struct perf_counts *counts;
- size_t mmap_len;
int idx;
void *priv;
};
@@ -44,9 +55,11 @@ struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx);
void perf_evsel__delete(struct perf_evsel *evsel);
int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
+int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads);
int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus);
-int perf_evsel__alloc_mmap(struct perf_evsel *evsel, int ncpus, int nthreads);
+int perf_evlist__alloc_mmap(struct perf_evlist *evlist, int ncpus);
void perf_evsel__free_fd(struct perf_evsel *evsel);
+void perf_evsel__free_id(struct perf_evsel *evsel);
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
@@ -55,10 +68,9 @@ int perf_evsel__open_per_thread(struct perf_evsel *evsel,
struct thread_map *threads, bool group, bool inherit);
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
struct thread_map *threads, bool group, bool inherit);
-int perf_evsel__mmap(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, int pages,
- struct perf_evlist *evlist);
-void perf_evsel__munmap(struct perf_evsel *evsel, int ncpus, int nthreads);
+int perf_evlist__mmap(struct perf_evlist *evlist, struct cpu_map *cpus,
+ struct thread_map *threads, int pages, bool overwrite);
+void perf_evlist__munmap(struct perf_evlist *evlist, int ncpus);
#define perf_evsel__match(evsel, t, c) \
(evsel->attr.type == PERF_TYPE_##t && \
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.