diff options
| author | Chris Wilson <[email protected]> | 2016-07-23 19:27:50 +0100 |
|---|---|---|
| committer | Paul E. McKenney <[email protected]> | 2016-09-14 12:57:43 -0700 |
| commit | 12adfd882c5f37548acaba4f043a158b3c54468b (patch) | |
| tree | 83c46e074a1044db2364cd712111550c994c3bc8 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py | |
| parent | 3563a438f124cb0b8cfd350c86de2f26c63d8837 (diff) | |
list: Expand list_first_entry_or_null()
Due to the use of READ_ONCE() in list_empty() the compiler cannot
optimise !list_empty() ? list_first_entry() : NULL very well. By
manually expanding list_first_entry_or_null() we can take advantage of
the READ_ONCE() to avoid the list element changing under the test while
the compiler can generate smaller code.
Signed-off-by: Chris Wilson <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: [email protected]
Signed-off-by: Paul E. McKenney <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py')
0 files changed, 0 insertions, 0 deletions