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| author | Peter Crosthwaite <peter.crosthwaite@xilinx.com> | 2015-03-02 22:19:14 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-03-17 13:17:29 +0300 |
| commit | 1baa82f48030f38d1895301f1ec93acbcb3d15db (patch) | |
| tree | 7d9e69cd915039f5fd62036351a4d78ad955b89c /tools/perf/scripts/python/call-graph-from-sql.py | |
| parent | 06e5801b8cb3fc057d88cb4dc03c0b64b2744cda (diff) | |
| download | linux-1baa82f48030f38d1895301f1ec93acbcb3d15db.tar.xz | |
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 <peter.crosthwaite@xilinx.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-sql.py')
0 files changed, 0 insertions, 0 deletions