[PATCH v2 0/4] perf tools: Backward ring buffer support

[Wang Nan <wangnan0@huawei.com>]

Commit 9ecda41acb97 ("perf/core: Add ::write_backward attribute to
perf event") introduces backward ring buffer. This 4 patches add basic
support for reading from it, and add a new test case for it.

v1 -> v2:
  Patch 1/5 in v1 has been collected by perf/core, so remove it;
  Change function names in patch 2/5 in v1 (1/4 in v2):
      __perf_evlist__mmap_read -> perf_mmap__read

Wang Nan (4):
  perf tools: Extract perf_mmap__read()
  perf tools: Rename variable in perf_mmap__read()
  perf tools: Support reading from backward ring buffer
  perf tests: Add test to check backward ring buffer

 tools/perf/tests/Build                  |   1 +
 tools/perf/tests/backward-ring-buffer.c | 151 ++++++++++++++++++++++++++++++++
 tools/perf/tests/builtin-test.c         |   4 +
 tools/perf/tests/tests.h                |   1 +
 tools/perf/util/evlist.c                |  95 +++++++++++++++-----
 tools/perf/util/evlist.h                |   4 +
 6 files changed, 233 insertions(+), 23 deletions(-)
 create mode 100644 tools/perf/tests/backward-ring-buffer.c

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
-- 
1.8.3.4