libperf: Add prev/start/end to struct perf_mmap

Move prev/start/end from tools/perf's mmap to libperf's perf_mmap struct.

Committer notes:

Add linux/types.h as we use u64.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-16-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/include/internal/mmap.h

@@ -3,6 +3,7 @@
 #define __LIBPERF_INTERNAL_MMAP_H
 
 #include <linux/refcount.h>
+#include <linux/types.h>
 
 /**
  * struct perf_mmap - perf's ring buffer mmap details
@@ -15,6 +16,9 @@ struct perf_mmap {
 	int		 fd;
 	int		 cpu;
 	refcount_t	 refcnt;
+	u64		 prev;
+	u64		 start;
+	u64		 end;
 };
 
 #endif /* __LIBPERF_INTERNAL_MMAP_H */

tools/perf/util/mmap.c

@@ -94,19 +94,19 @@ union perf_event *perf_mmap__read_event(struct mmap *map)
 
 	/* non-overwirte doesn't pause the ringbuffer */
 	if (!map->overwrite)
-		map->end = perf_mmap__read_head(map);
+		map->core.end = perf_mmap__read_head(map);
 
-	event = perf_mmap__read(map, &map->start, map->end);
+	event = perf_mmap__read(map, &map->core.start, map->core.end);
 
 	if (!map->overwrite)
-		map->prev = map->start;
+		map->core.prev = map->core.start;
 
 	return event;
 }
 
 static bool perf_mmap__empty(struct mmap *map)
 {
-	return perf_mmap__read_head(map) == map->prev && !map->auxtrace_mmap.base;
+	return perf_mmap__read_head(map) == map->core.prev && !map->auxtrace_mmap.base;
 }
 
 void perf_mmap__get(struct mmap *map)
@@ -125,7 +125,7 @@ void perf_mmap__put(struct mmap *map)
 void perf_mmap__consume(struct mmap *map)
 {
 	if (!map->overwrite) {
-		u64 old = map->prev;
+		u64 old = map->core.prev;
 
 		perf_mmap__write_tail(map, old);
 	}
@@ -368,7 +368,7 @@ int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
 	 * perf_evlist__filter_pollfd().
 	 */
 	refcount_set(&map->core.refcnt, 2);
-	map->prev = 0;
+	map->core.prev = 0;
 	map->core.mask = mp->mask;
 	map->core.base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
 			 MAP_SHARED, fd, 0);
@@ -443,22 +443,22 @@ static int overwrite_rb_find_range(void *buf, int mask, u64 *start, u64 *end)
 static int __perf_mmap__read_init(struct mmap *md)
 {
 	u64 head = perf_mmap__read_head(md);
-	u64 old = md->prev;
+	u64 old = md->core.prev;
 	unsigned char *data = md->core.base + page_size;
 	unsigned long size;
 
-	md->start = md->overwrite ? head : old;
-	md->end = md->overwrite ? old : head;
+	md->core.start = md->overwrite ? head : old;
+	md->core.end = md->overwrite ? old : head;
 
-	if ((md->end - md->start) < md->flush)
+	if ((md->core.end - md->core.start) < md->flush)
 		return -EAGAIN;
 
-	size = md->end - md->start;
+	size = md->core.end - md->core.start;
 	if (size > (unsigned long)(md->core.mask) + 1) {
 		if (!md->overwrite) {
 			WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
 
-			md->prev = head;
+			md->core.prev = head;
 			perf_mmap__consume(md);
 			return -EAGAIN;
 		}
@@ -467,7 +467,7 @@ static int __perf_mmap__read_init(struct mmap *md)
 		 * Backward ring buffer is full. We still have a chance to read
 		 * most of data from it.
 		 */
-		if (overwrite_rb_find_range(data, md->core.mask, &md->start, &md->end))
+		if (overwrite_rb_find_range(data, md->core.mask, &md->core.start, &md->core.end))
 			return -EINVAL;
 	}
 
@@ -498,12 +498,12 @@ int perf_mmap__push(struct mmap *md, void *to,
 	if (rc < 0)
 		return (rc == -EAGAIN) ? 1 : -1;
 
-	size = md->end - md->start;
+	size = md->core.end - md->core.start;
 
-	if ((md->start & md->core.mask) + size != (md->end & md->core.mask)) {
-		buf = &data[md->start & md->core.mask];
-		size = md->core.mask + 1 - (md->start & md->core.mask);
-		md->start += size;
+	if ((md->core.start & md->core.mask) + size != (md->core.end & md->core.mask)) {
+		buf = &data[md->core.start & md->core.mask];
+		size = md->core.mask + 1 - (md->core.start & md->core.mask);
+		md->core.start += size;
 
 		if (push(md, to, buf, size) < 0) {
 			rc = -1;
@@ -511,16 +511,16 @@ int perf_mmap__push(struct mmap *md, void *to,
 		}
 	}
 
-	buf = &data[md->start & md->core.mask];
-	size = md->end - md->start;
-	md->start += size;
+	buf = &data[md->core.start & md->core.mask];
+	size = md->core.end - md->core.start;
+	md->core.start += size;
 
 	if (push(md, to, buf, size) < 0) {
 		rc = -1;
 		goto out;
 	}
 
-	md->prev = head;
+	md->core.prev = head;
 	perf_mmap__consume(md);
 out:
 	return rc;
@@ -529,8 +529,8 @@ int perf_mmap__push(struct mmap *md, void *to,
 /*
  * Mandatory for overwrite mode
  * The direction of overwrite mode is backward.
- * The last perf_mmap__read() will set tail to map->prev.
- * Need to correct the map->prev to head which is the end of next read.
+ * The last perf_mmap__read() will set tail to map->core.prev.
+ * Need to correct the map->core.prev to head which is the end of next read.
  */
 void perf_mmap__read_done(struct mmap *map)
 {
@@ -540,5 +540,5 @@ void perf_mmap__read_done(struct mmap *map)
 	if (!refcount_read(&map->core.refcnt))
 		return;
 
-	map->prev = perf_mmap__read_head(map);
+	map->core.prev = perf_mmap__read_head(map);
 }

tools/perf/util/mmap.h

@@ -22,9 +22,6 @@ struct aiocb;
  */
 struct mmap {
 	struct perf_mmap	core;
-	u64		 prev;
-	u64		 start;
-	u64		 end;
 	bool		 overwrite;
 	struct auxtrace_mmap auxtrace_mmap;
 	char		 event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);