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libperf: Add 'refcnt' to struct perf_mmap

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Move 'refcnt' from tools/perf's mmap to libperf's perf_mmap struct.

Committer notes:

Add the refcount.h include directive here, now it is needed.

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/20190913132355.21634-15-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-07-27 22:35:35 +02:00 committed by Arnaldo Carvalho de Melo
parent 56a94706cd
commit e03edfeac0
4 changed files with 13 additions and 11 deletions
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3
tools/perf/lib/include/internal/mmap.h
View File

@ -2,6 +2,8 @@
#ifndef __LIBPERF_INTERNAL_MMAP_H
#define __LIBPERF_INTERNAL_MMAP_H
#include <linux/refcount.h>
/**
* struct perf_mmap - perf's ring buffer mmap details
*
@ -12,6 +14,7 @@ struct perf_mmap {
int mask;
int fd;
int cpu;
refcount_t refcnt;
};
#endif /* __LIBPERF_INTERNAL_MMAP_H */

2
tools/perf/util/evlist.c
View File

@ -719,7 +719,7 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
* Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
* thus does perf_mmap__get() on it.
*/
refcount_set(&map[i].refcnt, 0);
refcount_set(&map[i].core.refcnt, 0);
}
return map;
}

18
tools/perf/util/mmap.c
View File

@ -89,7 +89,7 @@ union perf_event *perf_mmap__read_event(struct mmap *map)
/*
* Check if event was unmapped due to a POLLHUP/POLLERR.
*/
if (!refcount_read(&map->refcnt))
if (!refcount_read(&map->core.refcnt))
return NULL;
/* non-overwirte doesn't pause the ringbuffer */
@ -111,14 +111,14 @@ static bool perf_mmap__empty(struct mmap *map)
void perf_mmap__get(struct mmap *map)
{
refcount_inc(&map->refcnt);
refcount_inc(&map->core.refcnt);
}
void perf_mmap__put(struct mmap *map)
{
BUG_ON(map->core.base && refcount_read(&map->refcnt) == 0);
BUG_ON(map->core.base && refcount_read(&map->core.refcnt) == 0);
if (refcount_dec_and_test(&map->refcnt))
if (refcount_dec_and_test(&map->core.refcnt))
perf_mmap__munmap(map);
}
@ -130,7 +130,7 @@ void perf_mmap__consume(struct mmap *map)
perf_mmap__write_tail(map, old);
}
if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))
if (refcount_read(&map->core.refcnt) == 1 && perf_mmap__empty(map))
perf_mmap__put(map);
}
@ -321,7 +321,7 @@ void perf_mmap__munmap(struct mmap *map)
munmap(map->core.base, perf_mmap__mmap_len(map));
map->core.base = NULL;
map->core.fd = -1;
refcount_set(&map->refcnt, 0);
refcount_set(&map->core.refcnt, 0);
}
auxtrace_mmap__munmap(&map->auxtrace_mmap);
}
@ -367,7 +367,7 @@ int perf_mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
* evlist layer can't just drop it when filtering events in
* perf_evlist__filter_pollfd().
*/
refcount_set(&map->refcnt, 2);
refcount_set(&map->core.refcnt, 2);
map->prev = 0;
map->core.mask = mp->mask;
map->core.base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
@ -479,7 +479,7 @@ int perf_mmap__read_init(struct mmap *map)
/*
* Check if event was unmapped due to a POLLHUP/POLLERR.
*/
if (!refcount_read(&map->refcnt))
if (!refcount_read(&map->core.refcnt))
return -ENOENT;
return __perf_mmap__read_init(map);
@ -537,7 +537,7 @@ void perf_mmap__read_done(struct mmap *map)
/*
* Check if event was unmapped due to a POLLHUP/POLLERR.
*/
if (!refcount_read(&map->refcnt))
if (!refcount_read(&map->core.refcnt))
return;
map->prev = perf_mmap__read_head(map);

1
tools/perf/util/mmap.h
View File

@ -22,7 +22,6 @@ struct aiocb;
*/
struct mmap {
struct perf_mmap core;
refcount_t refcnt;
u64 prev;
u64 start;
u64 end;