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perf record: Decouple record__mmap_read() and evlist. 

Perf evlist will have multiple mmap arrays. Update record__mmap_read():
it should read from 'struct perf_mmap' directly.

Also, make record__mmap_read() ready to read from backward ring buffer.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-5-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-07-14 08:34:36 +00:00 committed by Arnaldo Carvalho de Melo
parent 8db6d6b19e
commit a4ea0ec4f2
1 changed files with 23 additions and 16 deletions
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39
tools/perf/builtin-record.c
View File

@ -119,11 +119,10 @@ backward_rb_find_range(void *buf, int mask, u64 head, u64 *start, u64 *end)
}
static int
rb_find_range(struct perf_evlist *evlist,
void *data, int mask, u64 head, u64 old,
u64 *start, u64 *end)
rb_find_range(void *data, int mask, u64 head, u64 old,
u64 *start, u64 *end, bool backward)
{
if (!evlist->backward) {
if (!backward) {
*start = old;
*end = head;
return 0;
@ -132,9 +131,10 @@ 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, struct perf_evlist *evlist, int idx)
static int
record__mmap_read(struct record *rec, struct perf_mmap *md,
bool overwrite, bool backward)
{
struct perf_mmap *md = &evlist->mmap[idx];
u64 head = perf_mmap__read_head(md);
u64 old = md->prev;
u64 end = head, start = old;
@ -143,8 +143,8 @@ static int record__mmap_read(struct record *rec, struct perf_evlist *evlist, int
void *buf;
int rc = 0;
if (rb_find_range(evlist, data, md->mask, head,
old, &start, &end))
if (rb_find_range(data, md->mask, head,
old, &start, &end, backward))
return -1;
if (start == end)
@ -157,7 +157,7 @@ static int record__mmap_read(struct record *rec, struct perf_evlist *evlist, int
WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
md->prev = head;
perf_evlist__mmap_consume(evlist, idx);
perf_mmap__consume(md, overwrite || backward);
return 0;
}
@ -182,7 +182,7 @@ static int record__mmap_read(struct record *rec, struct perf_evlist *evlist, int
}
md->prev = head;
perf_evlist__mmap_consume(evlist, idx);
perf_mmap__consume(md, overwrite || backward);
out:
return rc;
}
@ -498,20 +498,27 @@ static struct perf_event_header finished_round_event = {
.type = PERF_RECORD_FINISHED_ROUND,
};
static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist)
static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist,
bool backward)
{
u64 bytes_written = rec->bytes_written;
int i;
int rc = 0;
struct perf_mmap *maps;
if (!evlist)
return 0;
for (i = 0; i < evlist->nr_mmaps; i++) {
struct auxtrace_mmap *mm = &evlist->mmap[i].auxtrace_mmap;
maps = evlist->mmap;
if (!maps)
return 0;
if (evlist->mmap[i].base) {
if (record__mmap_read(rec, evlist, i) != 0) {
for (i = 0; i < evlist->nr_mmaps; i++) {
struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap;
if (maps[i].base) {
if (record__mmap_read(rec, &maps[i],
evlist->overwrite, backward) != 0) {
rc = -1;
goto out;
}
@ -539,7 +546,7 @@ static int record__mmap_read_all(struct record *rec)
{
int err;
err = record__mmap_read_evlist(rec, rec->evlist);
err = record__mmap_read_evlist(rec, rec->evlist, false);
if (err)
return err;