perf mmap: Introduce perf_mmap__read_done()
authorKan Liang <kan.liang@intel.com>
Thu, 18 Jan 2018 21:26:22 +0000 (13:26 -0800)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 15 Feb 2018 12:53:15 +0000 (09:53 -0300)
commitee023de05f35484691f7d9e5c1f92195ac4d64d2
tree8a8457fb8ee19410155576a65f6f197c0d53342f
parentb4b036b4c76341a5034e872aca3727c4988a7304
perf mmap: Introduce perf_mmap__read_done()

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>
tools/perf/util/mmap.c
tools/perf/util/mmap.h