diff options
| author | Will Deacon <[email protected]> | 2013-09-04 12:30:08 +0100 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2014-10-20 18:49:18 +0100 |
| commit | a8e0aead70b4af957e6b27b82fba849c6179b707 (patch) | |
| tree | 2127e811b50ddf23f21ae678abc129b34e52ded7 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py | |
| parent | cbc908ef8e6babc40cb929f46ea1b8a26cbdbce0 (diff) | |
documentation: memory-barriers: clarify relaxed io accessor semantics
This patch extends the paragraph describing the relaxed read io accessors
so that the relaxed accessors are defined to be:
- Ordered with respect to each other if accessing the same peripheral
- Unordered with respect to normal memory accesses
- Unordered with respect to LOCK/UNLOCK operations
Whilst many architectures will provide stricter semantics, ARM, Alpha and
PPC can achieve significant performance gains by taking advantage of some
or all of the above relaxations.
Cc: Randy Dunlap <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: David Howells <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/Util.py')
0 files changed, 0 insertions, 0 deletions