[PATCH v12 10/16] perf record: Introduce compressor at mmap buffer object

Alexey Bayduraev
2021-11-23T14:10:17Z

Introduce compressor object into mmap object so it could be used to
pack the data stream from the corresponding kernel data buffer.
Initialize and make use of the introduced per mmap compressor.

Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
---
tools/perf/builtin-record.c | 18 +++++++++++-------
tools/perf/util/mmap.c | 10 ++++++++++
tools/perf/util/mmap.h | 2 ++
3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index cd4f74c311e8..1581da48fa9b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -243,8 +243,8 @@ static int record__write(struct record *rec, struct mmap *map __maybe_unused,

static int record__aio_enabled(struct record *rec);
static int record__comp_enabled(struct record *rec);
-static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
- void *src, size_t src_size);
+static size_t zstd_compress(struct perf_session *session, struct mmap *map,
+ void *dst, size_t dst_size, void *src, size_t src_size);

#ifdef HAVE_AIO_SUPPORT
static int record__aio_write(struct aiocb *cblock, int trace_fd,
@@ -378,7 +378,7 @@ static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size
*/

if (record__comp_enabled(aio->rec)) {
- size = zstd_compress(aio->rec->session, aio->data + aio->size,
+ size = zstd_compress(aio->rec->session, NULL, aio->data + aio->size,
mmap__mmap_len(map) - aio->size,
buf, size);
} else {
@@ -605,7 +605,7 @@ static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
struct record *rec = to;

if (record__comp_enabled(rec)) {
- size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
+ size = zstd_compress(rec->session, map, map->data, mmap__mmap_len(map), bf, size);
bf = map->data;
}

@@ -1398,13 +1398,17 @@ static size_t process_comp_header(void *record, size_t increment)
return size;
}

-static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
- void *src, size_t src_size)
+static size_t zstd_compress(struct perf_session *session, struct mmap *map,
+ void *dst, size_t dst_size, void *src, size_t src_size)
{
size_t compressed;
size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
+ struct zstd_data *zstd_data = &session->zstd_data;

- compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
+ if (map && map->file)
+ zstd_data = &map->zstd_data;
+
+ compressed = zstd_compress_stream_to_records(zstd_data, dst, dst_size, src, src_size,
max_record_size, process_comp_header);

session->bytes_transferred += src_size;
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 23ecdba9e670..e0e95abfc983 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -230,6 +230,10 @@ void mmap__munmap(struct mmap *map)
{
bitmap_free(map->affinity_mask.bits);

+#ifndef PYTHON_PERF
+ zstd_fini(&map->zstd_data);
+#endif
+
perf_mmap__aio_munmap(map);
if (map->data != NULL) {
munmap(map->data, mmap__mmap_len(map));
@@ -291,6 +295,12 @@ int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
map->core.flush = mp->flush;

map->comp_level = mp->comp_level;
+#ifndef PYTHON_PERF
+ if (zstd_init(&map->zstd_data, map->comp_level)) {
+ pr_debug2("failed to init mmap commpressor, error %d\n", errno);
+ return -1;
+ }
+#endif

if (map->comp_level && !perf_mmap__aio_enabled(map)) {
map->data = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE,
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index a3370a8bf307..9e4d3965641a 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -14,6 +14,7 @@
#endif
#include "auxtrace.h"
#include "event.h"
+#include "util/compress.h"

struct aiocb;

@@ -45,6 +46,7 @@ struct mmap {
void *data;
int comp_level;
struct perf_data_file *file;
+ struct zstd_data zstd_data;
};

struct mmap_params {
--
2.19.0