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libperf: Add perf_mmap struct

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Add the perf_mmap struct to libperf.

The definition is added into:

  include/internal/mmap.h

which is not to be included by users, but shared within perf and
libperf.

Committer notes:

Remove unnecessary includes from tools/perf/lib/include/internal/mmap.h,
those will be readded as they become necessary, later in the series.

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/20190913132355.21634-11-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
2019-07-27 22:07:44 +02:00
committed by Arnaldo Carvalho de Melo
parent e0fcfb086f
commit 547740f7b3
7 changed files with 39 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
tools/perf/util/mmap.c
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@@ -31,7 +31,7 @@ size_t perf_mmap__mmap_len(struct mmap *map)
static union perf_event *perf_mmap__read(struct mmap *map,
u64 *startp, u64 end)
{
unsigned char *data = map->base + page_size;
unsigned char *data = map->core.base + page_size;
union perf_event *event = NULL;
int diff = end - *startp;
@@ -116,7 +116,7 @@ void perf_mmap__get(struct mmap *map)
void perf_mmap__put(struct mmap *map)
{
BUG_ON(map->base && refcount_read(&map->refcnt) == 0);
BUG_ON(map->core.base && refcount_read(&map->refcnt) == 0);
if (refcount_dec_and_test(&map->refcnt))
perf_mmap__munmap(map);
@@ -317,9 +317,9 @@ void perf_mmap__munmap(struct mmap *map)
munmap(map->data, perf_mmap__mmap_len(map));
map->data = NULL;
}
if (map->base != NULL) {
munmap(map->base, perf_mmap__mmap_len(map));
map->base = NULL;
if (map->core.base != NULL) {
munmap(map->core.base, perf_mmap__mmap_len(map));
map->core.base = NULL;
map->fd = -1;
refcount_set(&map->refcnt, 0);
}
@@ -370,12 +370,12 @@ int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
refcount_set(&map->refcnt, 2);
map->prev = 0;
map->mask = mp->mask;
map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
map->core.base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
MAP_SHARED, fd, 0);
if (map->base == MAP_FAILED) {
if (map->core.base == MAP_FAILED) {
pr_debug2("failed to mmap perf event ring buffer, error %d\n",
errno);
map->base = NULL;
map->core.base = NULL;
return -1;
}
map->fd = fd;
@@ -399,7 +399,7 @@ int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
}
if (auxtrace_mmap__mmap(&map->auxtrace_mmap,
&mp->auxtrace_mp, map->base, fd))
&mp->auxtrace_mp, map->core.base, fd))
return -1;
return perf_mmap__aio_mmap(map, mp);
@@ -444,7 +444,7 @@ static int __perf_mmap__read_init(struct mmap *md)
{
u64 head = perf_mmap__read_head(md);
u64 old = md->prev;
unsigned char *data = md->base + page_size;
unsigned char *data = md->core.base + page_size;
unsigned long size;
md->start = md->overwrite ? head : old;
@@ -489,7 +489,7 @@ int perf_mmap__push(struct mmap *md, void *to,
int push(struct mmap *map, void *to, void *buf, size_t size))
{
u64 head = perf_mmap__read_head(md);
unsigned char *data = md->base + page_size;
unsigned char *data = md->core.base + page_size;
unsigned long size;
void *buf;
int rc = 0;