[PATCH 2/5] perf session: Add reader object

From: Jiri Olsa
Date: Wed Dec 26 2018 - 08:51:44 EST


Adding session private reader object to encapsulate reading
of the event data block. Starting with fd field inside.

Link: http://lkml.kernel.org/n/tip-glbs0xvtdcstckscvahueigf@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/perf/util/session.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index d6c1d3853f27..f5eecae982ba 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1813,11 +1813,17 @@ fetch_mmaped_event(struct perf_session *session,
#define NUM_MMAPS 128
#endif

+struct reader {
+ int fd;
+};
+
static int __perf_session__process_events(struct perf_session *session)
{
+ struct reader rd = {
+ .fd = perf_data__fd(session->data),
+ };
struct ordered_events *oe = &session->ordered_events;
struct perf_tool *tool = session->tool;
- int fd = perf_data__fd(session->data);
u64 data_offset = session->header.data_offset;
u64 data_size = session->header.data_size;
u64 head, page_offset, file_offset, file_pos, size;
@@ -1857,7 +1863,7 @@ static int __perf_session__process_events(struct perf_session *session)
mmap_flags = MAP_PRIVATE;
}
remap:
- buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, fd,
+ buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, rd.fd,
file_offset);
if (buf == MAP_FAILED) {
pr_err("failed to mmap file\n");
--
2.17.2