perf session: Add reader object

Add a session private reader object to encapsulate the reading of the
event data block. Starting with a 'fd' field.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190110101301.6196-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index c8c2069..06379cc 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1820,11 +1820,17 @@ 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;
@@ -1864,7 +1870,7 @@ 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");