by tip-bot for Vasyl Gomonovych

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Subject: [tip:perf/core] perf mmap: Remove overwrite and check_messup from mmap read

Commit-ID: 8eb7a1fe31612fd3e8ae8042dd2ebaf7575504cb
Gitweb: https://git.kernel.org/tip/8eb7a1fe31612fd3e8ae8042dd2ebaf7575504cb
Author: Wang Nan <[email protected]>
AuthorDate: Sun, 3 Dec 2017 02:00:41 +0000
Committer: Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Tue, 5 Dec 2017 15:43:54 -0300

perf mmap: Remove overwrite and check_messup from mmap read

All perf_mmap__read_forward() read from read-write ring buffer, so no
need check_messup. Reading from backward ring buffer doesn't require
check_messup because it never mess up. Cleanup arguments lists.

Signed-off-by: Wang Nan <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/util/evlist.c | 2 +-
tools/perf/util/mmap.c | 28 ++++------------------------
tools/perf/util/mmap.h | 2 +-
3 files changed, 6 insertions(+), 26 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a59134f..68c1f95 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -711,7 +711,7 @@ union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int
* No need for read-write ring buffer: kernel stop outputting when
* it hit md->prev (perf_mmap__consume()).
*/
- return perf_mmap__read_forward(md, false);
+ return perf_mmap__read_forward(md);
}

union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 703ed41..3f262e7 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -21,33 +21,13 @@ size_t perf_mmap__mmap_len(struct perf_mmap *map)
}

/* When check_messup is true, 'end' must points to a good entry */
-static union perf_event *perf_mmap__read(struct perf_mmap *map, bool check_messup,
+static union perf_event *perf_mmap__read(struct perf_mmap *map,
u64 start, u64 end, u64 *prev)
{
unsigned char *data = map->base + page_size;
union perf_event *event = NULL;
int diff = end - start;

- if (check_messup) {
- /*
- * If we're further behind than half the buffer, there's a chance
- * the writer will bite our tail and mess up the samples under us.
- *
- * If we somehow ended up ahead of the 'end', we got messed up.
- *
- * In either case, truncate and restart at 'end'.
- */
- if (diff > map->mask / 2 || diff < 0) {
- fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
-
- /*
- * 'end' points to a known good entry, start there.
- */
- start = end;
- diff = 0;
- }
- }
-
if (diff >= (int)sizeof(event->header)) {
size_t size;

@@ -89,7 +69,7 @@ broken_event:
return event;
}

-union perf_event *perf_mmap__read_forward(struct perf_mmap *map, bool check_messup)
+union perf_event *perf_mmap__read_forward(struct perf_mmap *map)
{
u64 head;
u64 old = map->prev;
@@ -102,7 +82,7 @@ union perf_event *perf_mmap__read_forward(struct perf_mmap *map, bool check_mess

head = perf_mmap__read_head(map);

- return perf_mmap__read(map, check_messup, old, head, &map->prev);
+ return perf_mmap__read(map, old, head, &map->prev);
}

union perf_event *perf_mmap__read_backward(struct perf_mmap *map)
@@ -138,7 +118,7 @@ union perf_event *perf_mmap__read_backward(struct perf_mmap *map)
else
end = head + map->mask + 1;

- return perf_mmap__read(map, false, start, end, &map->prev);
+ return perf_mmap__read(map, start, end, &map->prev);
}

void perf_mmap__read_catchup(struct perf_mmap *map)
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 2c3d291..d640273 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -86,7 +86,7 @@ static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
pc->data_tail = tail;
}

-union perf_event *perf_mmap__read_forward(struct perf_mmap *map, bool check_messup);
+union perf_event *perf_mmap__read_forward(struct perf_mmap *map);
union perf_event *perf_mmap__read_backward(struct perf_mmap *map);

int perf_mmap__push(struct perf_mmap *md, bool backward,