perf session: Move init/release code to separate functions

Separate init/release code into reader__init() and reader__release_decomp()
functions.

Remove a duplicate call to ui_progress__init_size(), the same call can
be found in __perf_session__process_events().

For multiple traces ui_progress should be initialized by total size
before reader__init() calls.

Suggested-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Reviewed-by: Riccardo Mancini <rickyman7@gmail.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Tested-by: Riccardo Mancini <rickyman7@gmail.com>
Acked-by: Namhyung Kim <namhyung@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Antonov <alexander.antonov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/8bacf247de220be8e57af1d2b796322175f5e257.1634113027.git.alexey.v.bayduraev@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/session.c

@@ -2189,35 +2189,55 @@ struct reader {
 };
 
 static int
-reader__process_events(struct reader *rd, struct perf_session *session,
-		       struct ui_progress *prog)
+reader__init(struct reader *rd, bool *one_mmap)
 {
 	u64 data_size = rd->data_size;
-	u64 page_offset, size;
-	int err = 0, mmap_prot, mmap_flags;
-	char *buf, **mmaps = rd->mmaps;
-	union perf_event *event;
-	s64 skip;
+	u64 page_offset;
+	char **mmaps = rd->mmaps;
 
 	page_offset = page_size * (rd->data_offset / page_size);
 	rd->file_offset = page_offset;
 	rd->head = rd->data_offset - page_offset;
 
-	ui_progress__init_size(prog, data_size, "Processing events...");
-
 	data_size += rd->data_offset;
 
 	rd->mmap_size = MMAP_SIZE;
 	if (rd->mmap_size > data_size) {
 		rd->mmap_size = data_size;
-		session->one_mmap = true;
+		if (one_mmap)
+			*one_mmap = true;
 	}
 
 	memset(mmaps, 0, sizeof(rd->mmaps));
 
 	if (zstd_init(&rd->zstd_data, 0))
 		return -1;
 	rd->decomp_data.zstd_decomp = &rd->zstd_data;
+
+	return 0;
+}
+
+static void
+reader__release_decomp(struct reader *rd)
+{
+	perf_decomp__release_events(rd->decomp_data.decomp);
+	zstd_fini(&rd->zstd_data);
+}
+
+static int
+reader__process_events(struct reader *rd, struct perf_session *session,
+		       struct ui_progress *prog)
+{
+	u64 page_offset, size;
+	int err = 0, mmap_prot, mmap_flags;
+	char *buf, **mmaps = rd->mmaps;
+	union perf_event *event;
+	s64 skip;
+
+	err = reader__init(rd, &session->one_mmap);
+	if (err)
+		goto out;
+
 	session->active_decomp = &rd->decomp_data;
 
 	mmap_prot  = PROT_READ;
@@ -2291,7 +2311,7 @@ reader__process_events(struct reader *rd, struct perf_session *session,
 	if (session_done())
 		goto out;
 
-	if (rd->file_pos < data_size)
+	if (rd->file_pos < rd->data_size + rd->data_offset)
 		goto more;
 
 out:
@@ -2348,8 +2368,7 @@ static int __perf_session__process_events(struct perf_session *session)
 	 */
 	ordered_events__reinit(&session->ordered_events);
 	auxtrace__free_events(session);
-	perf_decomp__release_events(rd.decomp_data.decomp);
-	zstd_fini(&rd.zstd_data);
+	reader__release_decomp(&rd);
 	session->one_mmap = false;
 	return err;
 }