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>

...

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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

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1

tools/perf/util/mmap.h

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