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| author | Li RongQing <[email protected]> | 2021-07-27 11:12:47 +0000 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2021-07-27 20:59:01 +0000 |
| commit | 74775654332b2682a5580d6f954e5a9ac81e7477 (patch) | |
| tree | 36e5a720e26b554856d3db47524f2369c8bd2d6a /drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | |
| parent | KVM: SVM: use vmcb01 in svm_refresh_apicv_exec_ctrl (diff) | |
| download | kernel-74775654332b2682a5580d6f954e5a9ac81e7477.tar.gz kernel-74775654332b2682a5580d6f954e5a9ac81e7477.zip | |
KVM: use cpu_relax when halt polling
SMT siblings share caches and other hardware, and busy halt polling
will degrade its sibling performance if its sibling is working
Sean Christopherson suggested as below:
"Rather than disallowing halt-polling entirely, on x86 it should be
sufficient to simply have the hardware thread yield to its sibling(s)
via PAUSE. It probably won't get back all performance, but I would
expect it to be close.
This compiles on all KVM architectures, and AFAICT the intended usage
of cpu_relax() is identical for all architectures."
Suggested-by: Sean Christopherson <[email protected]>
Signed-off-by: Li RongQing <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c')
0 files changed, 0 insertions, 0 deletions