[PATCH V4 08/15] perf mmap: discard legacy interface for mmap read

From: kan . liang
Date: Mon Jan 15 2018 - 15:23:18 EST


From: Kan Liang <kan.liang@xxxxxxxxx>

Discards perf_mmap__read_backward() and perf_mmap__read_catchup(). No
tools use them.

There are tools still use perf_mmap__read_forward(). Keep it, but add
comments to point to the new interface for future use.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
---
tools/perf/util/mmap.c | 50 ++++----------------------------------------------
tools/perf/util/mmap.h | 3 ---
2 files changed, 4 insertions(+), 49 deletions(-)

diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index de50c71..c2a56bb 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -63,6 +63,10 @@ static union perf_event *perf_mmap__read(struct perf_mmap *map,
return event;
}

+/*
+ * legacy interface for mmap read.
+ * Don't use it. Use perf_mmap__read_event().
+ */
union perf_event *perf_mmap__read_forward(struct perf_mmap *map)
{
u64 head;
@@ -78,41 +82,6 @@ union perf_event *perf_mmap__read_forward(struct perf_mmap *map)
return perf_mmap__read(map, &map->prev, head);
}

-union perf_event *perf_mmap__read_backward(struct perf_mmap *map)
-{
- u64 head, end;
-
- /*
- * Check if event was unmapped due to a POLLHUP/POLLERR.
- */
- if (!refcount_read(&map->refcnt))
- return NULL;
-
- head = perf_mmap__read_head(map);
- if (!head)
- return NULL;
-
- /*
- * 'head' pointer starts from 0. Kernel minus sizeof(record) form
- * it each time when kernel writes to it, so in fact 'head' is
- * negative. 'end' pointer is made manually by adding the size of
- * the ring buffer to 'head' pointer, means the validate data can
- * read is the whole ring buffer. If 'end' is positive, the ring
- * buffer has not fully filled, so we must adjust 'end' to 0.
- *
- * However, since both 'head' and 'end' is unsigned, we can't
- * simply compare 'end' against 0. Here we compare '-head' and
- * the size of the ring buffer, where -head is the number of bytes
- * kernel write to the ring buffer.
- */
- if (-head < (u64)(map->mask + 1))
- end = 0;
- else
- end = head + map->mask + 1;
-
- return perf_mmap__read(map, &map->prev, end);
-}
-
/*
* Read event from ring buffer one by one.
* Return one event for each call.
@@ -152,17 +121,6 @@ union perf_event *perf_mmap__read_event(struct perf_mmap *map,
return event;
}

-void perf_mmap__read_catchup(struct perf_mmap *map)
-{
- u64 head;
-
- if (!refcount_read(&map->refcnt))
- return;
-
- head = perf_mmap__read_head(map);
- map->prev = head;
-}
-
static bool perf_mmap__empty(struct perf_mmap *map)
{
return perf_mmap__read_head(map) == map->prev && !map->auxtrace_mmap.base;
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 29d7c5d..303e5d2 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -65,8 +65,6 @@ void perf_mmap__put(struct perf_mmap *map);

void perf_mmap__consume(struct perf_mmap *map, bool overwrite);

-void perf_mmap__read_catchup(struct perf_mmap *md);
-
static inline u64 perf_mmap__read_head(struct perf_mmap *mm)
{
struct perf_event_mmap_page *pc = mm->base;
@@ -87,7 +85,6 @@ static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
}

union perf_event *perf_mmap__read_forward(struct perf_mmap *map);
-union perf_event *perf_mmap__read_backward(struct perf_mmap *map);

union perf_event *perf_mmap__read_event(struct perf_mmap *map,
bool overwrite,
--
2.5.5