Commit ebe4d72b authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo

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: default avatarJiri 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e03edfea
......@@ -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 */
......@@ -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);
}
......@@ -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);
......
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