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libperf: Add perf_mmap__init() function

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Add perf_mmap__init() function to initialize 'struct perf_mmap' objects.

Add it to a new mmap.c source file, that will carry all the mmap related
functions.

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 <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-10-07 14:53:09 +02:00 committed by Arnaldo Carvalho de Melo
parent 26d5310ee2
commit 353120b48d
4 changed files with 14 additions and 3 deletions
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1
tools/perf/lib/Build
View File

@ -3,6 +3,7 @@ libperf-y += cpumap.o
libperf-y += threadmap.o
libperf-y += evsel.o
libperf-y += evlist.o
libperf-y += mmap.o
libperf-y += zalloc.o
libperf-y += xyarray.o
libperf-y += lib.o

2
tools/perf/lib/include/internal/mmap.h
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@ -29,4 +29,6 @@ struct perf_mmap {
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
};
void perf_mmap__init(struct perf_mmap *map, bool overwrite);
#endif /* __LIBPERF_INTERNAL_MMAP_H */

9
tools/perf/lib/mmap.c Normal file
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@ -0,0 +1,9 @@
// SPDX-License-Identifier: GPL-2.0
#include <internal/mmap.h>
void perf_mmap__init(struct perf_mmap *map, bool overwrite)
{
map->fd = -1;
map->overwrite = overwrite;
refcount_set(&map->refcnt, 0);
}

5
tools/perf/util/evlist.c
View File

@ -629,8 +629,6 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
return NULL;
for (i = 0; i < evlist->core.nr_mmaps; i++) {
map[i].core.fd = -1;
map[i].core.overwrite = overwrite;
/*
* When the perf_mmap() call is made we grab one refcount, plus
* one extra to let perf_mmap__consume() get the last
@ -640,8 +638,9 @@ 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].core.refcnt, 0);
perf_mmap__init(&map[i].core, overwrite);
}
return map;
}