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libperf: Adopt perf_mmap__read_done() from tools/perf

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Move perf_mmap__read_init() from tools/perf to libperf and export it in
the perf/mmap.h header.

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/20191007125344.14268-12-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
2019-10-07 14:53:19 +02:00
committed by Arnaldo Carvalho de Melo
parent 7c4d41824f
commit 32fdc2ca7e
20 changed files with 34 additions and 33 deletions
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17
tools/perf/util/mmap.c
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@@ -405,20 +405,3 @@ int perf_mmap__push(struct mmap *md, void *to,
out:
return rc;
}
/*
* Mandatory for overwrite mode
* The direction of overwrite mode is backward.
* 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)
{
/*
* Check if event was unmapped due to a POLLHUP/POLLERR.
*/
if (!refcount_read(&map->core.refcnt))
return;
map->core.prev = perf_mmap__read_head(&map->core);
}