perf record: Implement compression for serial trace streaming

Compression is implemented using the functions from zstd.c. As the
memory to operate on the compression uses mmap->data buffer.

If Zstd streaming compression API fails for some reason the data to be
compressed are just copied into the memory buffers using plain memcpy().

Compressed trace frame consists of an array of PERF_RECORD_COMPRESSED
records. Each element of the array is not longer that
PERF_SAMPLE_MAX_SIZE and consists of perf_event_header followed by the
compressed chunk that is decompressed on the loading stage.

Comitter notes:

Undo some unnecessary line breaks, remove some unnecessary () around
zstd_data to then just get its address, and fix conflicts with
BPF_PROG_INFO/BPF_BTF patchkits.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/744df43f-3932-2594-ddef-1e99a3cad03a@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ca6d7488e34b11e5aade7f63537d8d0f6b53be55..de9632c69852851c8437a5abe7d21cf81ad7f72d 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -133,6 +133,9 @@ static int record__write(struct record *rec, struct perf_mmap *map __maybe_unuse
        return 0;
 }
 
+static size_t zstd_compress(struct perf_session *session, 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,
                void *buf, size_t size, off_t off)
@@ -392,6 +395,11 @@ static int record__pushfn(struct perf_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, perf_mmap__mmap_len(map), bf, size);
+               bf   = map->data;
+       }
+
        rec->samples++;
        return record__write(rec, map, bf, size);
 }
@@ -778,6 +786,37 @@ static void record__adjust_affinity(struct record *rec, struct perf_mmap *map)
        }
 }
 
+static size_t process_comp_header(void *record, size_t increment)
+{
+       struct compressed_event *event = record;
+       size_t size = sizeof(*event);
+
+       if (increment) {
+               event->header.size += increment;
+               return increment;
+       }
+
+       event->header.type = PERF_RECORD_COMPRESSED;
+       event->header.size = size;
+
+       return size;
+}
+
+static size_t zstd_compress(struct perf_session *session, 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 compressed_event) - 1;
+
+       compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
+                                                    max_record_size, process_comp_header);
+
+       session->bytes_transferred += src_size;
+       session->bytes_compressed  += compressed;
+
+       return compressed;
+}
+
 static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist,
                                    bool overwrite, bool synch)
 {
@@ -1225,6 +1264,14 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
        fd = perf_data__fd(data);
        rec->session = session;
 
+       if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
+               pr_err("Compression initialization failed.\n");
+               return -1;
+       }
+
+       session->header.env.comp_type  = PERF_COMP_ZSTD;
+       session->header.env.comp_level = rec->opts.comp_level;
+
        record__init_features(rec);
 
        if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
@@ -1565,6 +1612,7 @@ out_child:
        }
 
 out_delete_session:
+       zstd_fini(&session->zstd_data);
        perf_session__delete(session);
 
        if (!opts->no_bpf_event)
@@ -2294,8 +2342,7 @@ int cmd_record(int argc, const char **argv)
 
        if (rec->opts.nr_cblocks > nr_cblocks_max)
                rec->opts.nr_cblocks = nr_cblocks_max;
-       if (verbose > 0)
-               pr_info("nr_cblocks: %d\n", rec->opts.nr_cblocks);
+       pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
 
        pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
        pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);

diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 0e14884f28b21e46aa8a624f4022579490d95424..6c984c895924fe6bba1351c80bbcdf575ff8b9cc 100644 (file)
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -8,6 +8,7 @@
 #include "machine.h"
 #include "data.h"
 #include "ordered-events.h"
+#include "util/compress.h"
 #include <linux/kernel.h>
 #include <linux/rbtree.h>
 #include <linux/perf_event.h>
@@ -37,6 +38,7 @@ struct perf_session {
        struct perf_tool        *tool;
        u64                     bytes_transferred;
        u64                     bytes_compressed;
+       struct zstd_data        zstd_data;
 };
 
 struct perf_tool;