[PATCH v9 21/24] perf session: Move init into reader__init function

Alexey Bayduraev
2021-07-02T12:33:46Z

Separating initialization code into reader__init function.

Design and implementation are based on the prototype [1], [2].

[1] git clone https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git -b perf/record_threads
[2] https://lore.kernel.org/lkml/20180913125450.21342-1-jolsa@kernel.org/

Suggested-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
---
tools/perf/util/session.c | 34 ++++++++++++++++++++++++----------
1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 2a0d3b3fd979..f25f5f33bec1 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -2214,28 +2214,25 @@ static int __perf_session__process_decomp_events(struct perf_session *session)
}

static int
-reader__process_events(struct reader *rd, struct perf_session *session,
- struct ui_progress *prog)
+reader__init(struct reader *rd, bool *one_mmap)
{
struct reader_state *st = &rd->state;
- u64 page_offset, size;
- int err = 0, mmap_prot, mmap_flags;
- char *buf, **mmaps = st->mmaps;
- union perf_event *event;
- s64 skip;
+ u64 page_offset;
+ char **mmaps = st->mmaps;
+
+ pr_debug("reader processing %s\n", rd->path);

page_offset = page_size * (rd->data_offset / page_size);
st->file_offset = page_offset;
st->head = rd->data_offset - page_offset;

- ui_progress__init_size(prog, rd->data_size, "Processing events...");
-
st->data_size = rd->data_size + rd->data_offset;

st->mmap_size = MMAP_SIZE;
if (st->mmap_size > st->data_size) {
st->mmap_size = st->data_size;
- session->one_mmap = true;
+ if (one_mmap)
+ *one_mmap = true;
}

memset(mmaps, 0, sizeof(st->mmaps));
@@ -2243,6 +2240,20 @@ reader__process_events(struct reader *rd, struct perf_session *session,
if (zstd_init(&rd->zstd_data, 0))
return -1;

+ return 0;
+}
+
+static int
+reader__process_events(struct reader *rd, struct perf_session *session,
+ struct ui_progress *prog)
+{
+ struct reader_state *st = &rd->state;
+ u64 page_offset, size;
+ int err = 0, mmap_prot, mmap_flags;
+ char *buf, **mmaps = st->mmaps;
+ union perf_event *event;
+ s64 skip;
+
mmap_prot = PROT_READ;
mmap_flags = MAP_SHARED;

@@ -2358,6 +2369,9 @@ static int __perf_session__process_events(struct perf_session *session)

ui_progress__init_size(&prog, rd->data_size, "Processing events...");

+ err = reader__init(rd, &session->one_mmap);
+ if (err)
+ goto out_err;
err = reader__process_events(rd, session, &prog);
if (err)
goto out_err;
--
2.19.0