Messages in this thread | | | From | Juergen Gross <> | Subject | [PATCH v2 0/2] guard virt_spin_lock() with a static key | Date | Wed, 6 Sep 2017 17:29:26 +0200 |
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With virt_spin_lock() being guarded by a static key the bare metal case can be optimized by patching the call away completely. In case a kernel running as a guest it can decide whether to use paravitualized spinlocks, the current fallback to the unfair test-and-set scheme, or to mimic the bare metal behavior.
V2: - use static key instead of making virt_spin_lock() a pvops function
Juergen Gross (2): paravirt/locks: use new static key for controlling call of virt_spin_lock() paravirt,xen: correct xen_nopvspin case
arch/x86/include/asm/qspinlock.h | 11 +++++++++++ arch/x86/kernel/paravirt-spinlocks.c | 6 ++++++ arch/x86/kernel/smpboot.c | 2 ++ arch/x86/xen/spinlock.c | 2 ++ kernel/locking/qspinlock.c | 4 ++++ 5 files changed, 25 insertions(+)
-- 2.12.3
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