[PATCH v10 02/10] perf record: Prepare reading from multiple evlists in record__mmap_read_all()

From: Wang Nan
Date: Thu Jun 23 2016 - 01:31:03 EST


Following commits introduce new evlists to record. This patch adjusts
record__mmap_read_all() and record__mmap_read(): converting original
record__mmap_read_all() to record__mmap_read_evlist(), read from one
evlist; makes record__mmap_read() reading from specific evlist.
record__mmap_read_all() will be improved to read from multiple evlists.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxx
---
tools/perf/builtin-record.c | 34 ++++++++++++++++++++++++----------
1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 7998ec3..bc34e6b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -131,9 +131,9 @@ rb_find_range(struct perf_evlist *evlist,
return backward_rb_find_range(data, mask, head, start, end);
}

-static int record__mmap_read(struct record *rec, int idx)
+static int record__mmap_read(struct record *rec, struct perf_evlist *evlist, int idx)
{
- struct perf_mmap *md = &rec->evlist->mmap[idx];
+ struct perf_mmap *md = &evlist->mmap[idx];
u64 head = perf_mmap__read_head(md);
u64 old = md->prev;
u64 end = head, start = old;
@@ -142,7 +142,7 @@ static int record__mmap_read(struct record *rec, int idx)
void *buf;
int rc = 0;

- if (rb_find_range(rec->evlist, data, md->mask, head,
+ if (rb_find_range(evlist, data, md->mask, head,
old, &start, &end))
return -1;

@@ -156,7 +156,7 @@ static int record__mmap_read(struct record *rec, int idx)
WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");

md->prev = head;
- perf_evlist__mmap_consume(rec->evlist, idx);
+ perf_evlist__mmap_consume(evlist, idx);
return 0;
}

@@ -181,7 +181,7 @@ static int record__mmap_read(struct record *rec, int idx)
}

md->prev = head;
- perf_evlist__mmap_consume(rec->evlist, idx);
+ perf_evlist__mmap_consume(evlist, idx);
out:
return rc;
}
@@ -497,17 +497,20 @@ static struct perf_event_header finished_round_event = {
.type = PERF_RECORD_FINISHED_ROUND,
};

-static int record__mmap_read_all(struct record *rec)
+static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist)
{
u64 bytes_written = rec->bytes_written;
int i;
int rc = 0;

- for (i = 0; i < rec->evlist->nr_mmaps; i++) {
- struct auxtrace_mmap *mm = &rec->evlist->mmap[i].auxtrace_mmap;
+ if (!evlist)
+ return 0;
+
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ struct auxtrace_mmap *mm = &evlist->mmap[i].auxtrace_mmap;

- if (rec->evlist->mmap[i].base) {
- if (record__mmap_read(rec, i) != 0) {
+ if (evlist->mmap[i].base) {
+ if (record__mmap_read(rec, evlist, i) != 0) {
rc = -1;
goto out;
}
@@ -531,6 +534,17 @@ out:
return rc;
}

+static int record__mmap_read_all(struct record *rec)
+{
+ int err;
+
+ err = record__mmap_read_evlist(rec, rec->evlist);
+ if (err)
+ return err;
+
+ return err;
+}
+
static void record__init_features(struct record *rec)
{
struct perf_session *session = rec->session;
--
1.8.3.4