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perf mmap: Introduce perf_mmap__read_done()

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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.

It will be used later.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1516310792-208685-8-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2018-01-18 13:26:22 -08:00 committed by Arnaldo Carvalho de Melo
parent b4b036b4c7
commit ee023de05f
2 changed files with 12 additions and 0 deletions
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11
tools/perf/util/mmap.c
View File

@ -338,3 +338,14 @@ int perf_mmap__push(struct perf_mmap *md, bool overwrite,
out:
return rc;
}
/*
* 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.
*/
void perf_mmap__read_done(struct perf_mmap *map)
{
map->prev = perf_mmap__read_head(map);
}

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

@ -96,4 +96,5 @@ size_t perf_mmap__mmap_len(struct perf_mmap *map);
int perf_mmap__read_init(struct perf_mmap *md, bool overwrite,
u64 *startp, u64 *endp);
void perf_mmap__read_done(struct perf_mmap *map);
#endif /*__PERF_MMAP_H */