Commit-ID: 3effc2f165a842d640873e29d4c5cc1650143aef
Gitweb: https://git.kernel.org/tip/3effc2f165a842d640873e29d4c5cc1650143aef
Author: Kan Liang <kan.liang@xxxxxxxxx>
AuthorDate: Thu, 18 Jan 2018 13:26:25 -0800
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 15 Feb 2018 09:54:17 -0300
perf mmap: Discard legacy interface for mmap read
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>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1516310792-208685-11-git-send-email-kan.liang@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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 f804926..91531a7 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 2871854..ec7d3a24 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,
--
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