On Wed, Sep 06, 2017 at 07:36:23PM +0200, Juergen Gross wrote: > 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. > > V3: > - remove test for hypervisor environment from virt_spin_lock(9 as > suggested by Waiman Long > > 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, 24 insertions(+), 1 deletion(-) Sorry for the delay, picked it up now. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
