search for: cpu_callout_mask

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

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

...IRT_SPINLOCKS */ > #endif /* CONFIG_PARAVIRT */ Because I think the above only ever uses native_virt_spin_lock() when PARAVIRT. > @@ -1381,6 +1382,7 @@ void __init native_smp_prepare_boot_cpu(void) > /* already set me in cpu_online_mask in boot_cpu_init() */ > cpumask_set_cpu(me, cpu_callout_mask); > cpu_set_state_online(me); > + native_pv_lock_init(); > } Aah, this is where that goes.. OK that works too.

...IRT_SPINLOCKS */ > #endif /* CONFIG_PARAVIRT */ Because I think the above only ever uses native_virt_spin_lock() when PARAVIRT. > @@ -1381,6 +1382,7 @@ void __init native_smp_prepare_boot_cpu(void) > /* already set me in cpu_online_mask in boot_cpu_init() */ > cpumask_set_cpu(me, cpu_callout_mask); > cpu_set_state_online(me); > + native_pv_lock_init(); > } Aah, this is where that goes.. OK that works too.

...realmode.h> #include <asm/misc.h> +#include <asm/qspinlock.h> /* Number of siblings per CPU package */ int smp_num_siblings = 1; @@ -1381,6 +1382,7 @@ void __init native_smp_prepare_boot_cpu(void) /* already set me in cpu_online_mask in boot_cpu_init() */ cpumask_set_cpu(me, cpu_callout_mask); cpu_set_state_online(me); + native_pv_lock_init(); } void __init native_smp_cpus_done(unsigned int max_cpus) diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 294294c71ba4..838d235b87ef 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -76,...

...sc.h> > +#include <asm/qspinlock.h> > > /* Number of siblings per CPU package */ > int smp_num_siblings = 1; > @@ -1381,6 +1382,7 @@ void __init native_smp_prepare_boot_cpu(void) > /* already set me in cpu_online_mask in boot_cpu_init() */ > cpumask_set_cpu(me, cpu_callout_mask); > cpu_set_state_online(me); > + native_pv_lock_init(); > } > > void __init native_smp_cpus_done(unsigned int max_cpus) > diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c > index 294294c71ba4..838d235b87ef 100644 > --- a/kernel/locking/qspinlock.c...

...sc.h> > +#include <asm/qspinlock.h> > > /* Number of siblings per CPU package */ > int smp_num_siblings = 1; > @@ -1381,6 +1382,7 @@ void __init native_smp_prepare_boot_cpu(void) > /* already set me in cpu_online_mask in boot_cpu_init() */ > cpumask_set_cpu(me, cpu_callout_mask); > cpu_set_state_online(me); > + native_pv_lock_init(); > } > > void __init native_smp_cpus_done(unsigned int max_cpus) > diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c > index 294294c71ba4..838d235b87ef 100644 > --- a/kernel/locking/qspinlock.c...

...realmode.h> #include <asm/misc.h> +#include <asm/qspinlock.h> /* Number of siblings per CPU package */ int smp_num_siblings = 1; @@ -1381,6 +1382,7 @@ void __init native_smp_prepare_boot_cpu(void) /* already set me in cpu_online_mask in boot_cpu_init() */ cpumask_set_cpu(me, cpu_callout_mask); cpu_set_state_online(me); + native_pv_lock_init(); } void __init native_smp_cpus_done(unsigned int max_cpus) -- 2.12.3

With virt_spin_lock() being a pvops function 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. Juergen Gross (4): paravirt: add generic _paravirt_false() function paravirt: switch

With virt_spin_lock() being a pvops function 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. Juergen Gross (4): paravirt: add generic _paravirt_false() function paravirt: switch

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

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