diff options
| author | Peter Crosthwaite <[email protected]> | 2015-03-02 19:19:14 +0000 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2015-03-17 10:17:29 +0000 |
| commit | 1baa82f48030f38d1895301f1ec93acbcb3d15db (patch) | |
| tree | 7d9e69cd915039f5fd62036351a4d78ad955b89c /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 06e5801b8cb3fc057d88cb4dc03c0b64b2744cda (diff) | |
arm64: Implement cpu_relax as yield
ARM64 has the yield nop hint which has the intended semantics of
cpu_relax. Implement.
The immediate application is ARM CPU emulators. An emulator can take
advantage of the yield hint to de-prioritise an emulated CPU in favor
of other emulation tasks. QEMU A64 SMP emulation has yield awareness,
and sees a significant boot time performance increase with this change.
Signed-off-by: Peter Crosthwaite <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions