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perf record: Make record__mmap_read generic 

It becomes a perf_mmap method, "push", that build reads from a mmap and
"pushes" it to a consumer, that in the initial case, for 'perf record',
just writes it to the perf.data file descriptor, but may be used by
'top', etc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-u4l1qjbi6l76r2k0nv99220n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-10-05 16:39:55 -03:00
parent 1695849735
commit d37f1586d0
1 changed files with 13 additions and 9 deletions
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22
tools/perf/builtin-record.c
View File

@ -176,9 +176,16 @@ rb_find_range(void *data, int mask, u64 head, u64 old,
return backward_rb_find_range(data, mask, head, start, end);
}
static int
record__mmap_read(struct record *rec, struct perf_mmap *md,
bool overwrite, bool backward)
static int record__pushfn(void *to, void *bf, size_t size)
{
struct record *rec = to;
rec->samples++;
return record__write(rec, bf, size);
}
static int perf_mmap__push(struct perf_mmap *md, bool overwrite, bool backward,
void *to, int push(void *to, void *buf, size_t size))
{
u64 head = perf_mmap__read_head(md);
u64 old = md->prev;
@ -195,8 +202,6 @@ record__mmap_read(struct record *rec, struct perf_mmap *md,
if (start == end)
return 0;
rec->samples++;
size = end - start;
if (size > (unsigned long)(md->mask) + 1) {
WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
@ -211,7 +216,7 @@ record__mmap_read(struct record *rec, struct perf_mmap *md,
size = md->mask + 1 - (start & md->mask);
start += size;
if (record__write(rec, buf, size) < 0) {
if (push(to, buf, size) < 0) {
rc = -1;
goto out;
}
@ -221,7 +226,7 @@ record__mmap_read(struct record *rec, struct perf_mmap *md,
size = end - start;
start += size;
if (record__write(rec, buf, size) < 0) {
if (push(to, buf, size) < 0) {
rc = -1;
goto out;
}
@ -576,8 +581,7 @@ static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evli
struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap;
if (maps[i].base) {
if (record__mmap_read(rec, &maps[i],
evlist->overwrite, backward) != 0) {
if (perf_mmap__push(&maps[i], evlist->overwrite, backward, rec, record__pushfn) != 0) {
rc = -1;
goto out;
}