search for: spin_trylock

...main *d, *pd = NULL; - unsigned long flags; - int error; - - if (state <= ACPI_STATE_S0 || state > ACPI_S_STATES_MAX) - return -EINVAL; - - /* Sync lazy state on ths cpu */ - __sync_lazy_execstate(); - pmprintk(XENLOG_INFO, "Flush lazy state\n"); - - if (!spin_trylock(&pm_lock)) - return -EBUSY; - +/* Record the last paused domain at freeze phase */ +static struct domain *pd; +static int freeze_domains(void) +{ + struct domain *d; + + pd = NULL; for_each_domain(d) if (d->domain_id != 0) { domain_pause(d...

...ffff80356fc0: 0:thread_return+37e mov 0x880(%r12), %edi static int _double_lock_balance(struct rq *this_rq, struct rq *busiest) __releases(this_rq->lock) __acquires(busiest->lock) __acquires(this_rq->lock) { int ret = 0; if (unlikely(!spin_trylock(&busiest->lock))) { if (busiest < this_rq) { spin_unlock(&this_rq->lock); spin_lock(&busiest->lock); spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);...

...on is a real possibility especially if the number of + * virtual CPUs is large. + * + * To reduce the undesirable side effects of an unfair lock, the queue + * unfair spinlock implements a more elaborate scheme. Lock stealing is + * allowed in the following places: + * 1) In the spin_lock and spin_trylock fastpaths + * 2) When spinning in the waiter queue before becoming the queue head + * + * A lock acquirer has only one chance of stealing the lock in the spin_lock + * and spin_trylock fastpath. If the attempt fails for spin_lock, the task + * will be queued in the wait queue. + * + * Even in the...

...{ int ret; @@ -657,7 +657,7 @@ static void stop_this_cpu (void * dummy) * this function calls the 'stop' function on all other CPUs in the system. */ -void smp_send_stop(void) +void native_smp_send_stop(void) { /* Don't deadlock on the call lock in panic */ int nolock = !spin_trylock(&call_lock); @@ -733,3 +733,14 @@ int safe_smp_processor_id(void) return cpuid >= 0 ? cpuid : 0; } + +struct smp_ops smp_ops = { + .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu, + .smp_prepare_cpus = native_smp_prepare_cpus, + .cpu_up = native_cpu_up, + .smp_cpus_done = native_smp...

...{ int ret; @@ -657,7 +657,7 @@ static void stop_this_cpu (void * dummy) * this function calls the 'stop' function on all other CPUs in the system. */ -void smp_send_stop(void) +void native_smp_send_stop(void) { /* Don't deadlock on the call lock in panic */ int nolock = !spin_trylock(&call_lock); @@ -733,3 +733,14 @@ int safe_smp_processor_id(void) return cpuid >= 0 ? cpuid : 0; } + +struct smp_ops smp_ops = { + .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu, + .smp_prepare_cpus = native_smp_prepare_cpus, + .cpu_up = native_cpu_up, + .smp_cpus_done = native_smp...

This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. The series provides implementation for both Xen and KVM. Changes in V9: - Changed spin_threshold to 32k to avoid excess halt exits that are causing undercommit degradation (after PLE handler improvement). - Added kvm_irq_delivery_to_apic (suggested by Gleb) - Optimized halt exit

This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. The series provides implementation for both Xen and KVM. Changes in V9: - Changed spin_threshold to 32k to avoid excess halt exits that are causing undercommit degradation (after PLE handler improvement). - Added kvm_irq_delivery_to_apic (suggested by Gleb) - Optimized halt exit

This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. The series provides implementation for both Xen and KVM. Changes in V9: - Changed spin_threshold to 32k to avoid excess halt exits that are causing undercommit degradation (after PLE handler improvement). - Added kvm_irq_delivery_to_apic (suggested by Gleb) - Optimized halt exit

...x86/ticketlock: clean up types and accessors x86/ticketlock: convert spin loop to C x86/ticketlock: Use C for __ticket_spin_unlock x86/ticketlock: make large and small ticket versions of spin_lock the same x86/ticketlock: make __ticket_spin_lock common x86/ticketlock: make __ticket_spin_trylock common x86/spinlocks: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen/pvticketlock: Xen implementation for PV ticket locks x86/pvticketlock: use callee-save for lock_spinning x86/ticketlock: don't inline _spin_unlock when using paravirt s...

...x86/ticketlock: clean up types and accessors x86/ticketlock: convert spin loop to C x86/ticketlock: Use C for __ticket_spin_unlock x86/ticketlock: make large and small ticket versions of spin_lock the same x86/ticketlock: make __ticket_spin_lock common x86/ticketlock: make __ticket_spin_trylock common x86/spinlocks: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen/pvticketlock: Xen implementation for PV ticket locks x86/pvticketlock: use callee-save for lock_spinning x86/ticketlock: don't inline _spin_unlock when using paravirt s...

...x86/ticketlock: clean up types and accessors x86/ticketlock: convert spin loop to C x86/ticketlock: Use C for __ticket_spin_unlock x86/ticketlock: make large and small ticket versions of spin_lock the same x86/ticketlock: make __ticket_spin_lock common x86/ticketlock: make __ticket_spin_trylock common x86/spinlocks: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen/pvticketlock: Xen implementation for PV ticket locks x86/pvticketlock: use callee-save for lock_spinning x86/ticketlock: don't inline _spin_unlock when using paravirt s...

...x86/ticketlock: clean up types and accessors x86/ticketlock: convert spin loop to C x86/ticketlock: Use C for __ticket_spin_unlock x86/ticketlock: make large and small ticket versions of spin_lock the same x86/ticketlock: make __ticket_spin_lock common x86/ticketlock: make __ticket_spin_trylock common x86/spinlocks: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen/pvticketlock: Xen implementation for PV ticket locks x86/pvticketlock: keep count of blocked cpus x86/pvticketlock: use callee-save for lock_spinning x86/pvticketlock: use ca...

...x86/ticketlock: clean up types and accessors x86/ticketlock: convert spin loop to C x86/ticketlock: Use C for __ticket_spin_unlock x86/ticketlock: make large and small ticket versions of spin_lock the same x86/ticketlock: make __ticket_spin_lock common x86/ticketlock: make __ticket_spin_trylock common x86/spinlocks: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen/pvticketlock: Xen implementation for PV ticket locks x86/pvticketlock: keep count of blocked cpus x86/pvticketlock: use callee-save for lock_spinning x86/pvticketlock: use ca...

...x86/ticketlock: clean up types and accessors x86/ticketlock: convert spin loop to C x86/ticketlock: Use C for __ticket_spin_unlock x86/ticketlock: make large and small ticket versions of spin_lock the same x86/ticketlock: make __ticket_spin_lock common x86/ticketlock: make __ticket_spin_trylock common x86/spinlocks: replace pv spinlocks with pv ticketlocks x86/ticketlock: collapse a layer of functions xen/pvticketlock: Xen implementation for PV ticket locks x86/pvticketlock: keep count of blocked cpus x86/pvticketlock: use callee-save for lock_spinning x86/pvticketlock: use ca...

...page so it closes the race. */ - VM_BUG_ON_PAGE(!is_first_page(page), page); - first_page = page; + first_page = get_first_page(page); /* * Without class lock, fullness is meaningless while constant @@ -2228,9 +2300,18 @@ bool zs_page_isolate(struct page *page, isolate_mode_t mode) if (!spin_trylock(&class->lock)) return false; + if (check_isolated_page(first_page)) + goto skip_isolate; + + /* + * If this is first time isolation for zspage, isolate zspage from + * size_class to prevent further allocations from the zspage. + */ get_zspage_mapping(first_page, &class_idx, &a...

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Changes since last posting: (Raghavendra K T) [ - Rebased to linux-3.3-rc6. - used function+enum in place of macro (better type checking) - use cmpxchg while resetting zero status for possible race [suggested by Dave Hansen for KVM patches ] ] This series replaces the existing paravirtualized spinlock mechanism with a

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> Changes since last posting: (Raghavendra K T) [ - Rebased to linux-3.3-rc6. - used function+enum in place of macro (better type checking) - use cmpxchg while resetting zero status for possible race [suggested by Dave Hansen for KVM patches ] ] This series replaces the existing paravirtualized spinlock mechanism with a

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. (targeted for 3.5 window) Changes in V7: - Reabsed patches to 3.4-rc3 - Added jumplabel split patch (originally from Andrew Jones rebased to 3.4-rc3 - jumplabel changes from Ingo and Jason taken and now using

From: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com> This series replaces the existing paravirtualized spinlock mechanism with a paravirtualized ticketlock mechanism. (targeted for 3.5 window) Changes in V7: - Reabsed patches to 3.4-rc3 - Added jumplabel split patch (originally from Andrew Jones rebased to 3.4-rc3 - jumplabel changes from Ingo and Jason taken and now using

When secondary cpus are initialized during an i386 pv-guest restore (due to save/restore or live migration), and the guest has a load that generates a fair number of interrupts (e.g., parallel kernel make), a stack overflow can occur because cpu_initialize_context() has a 2800 byte structure it declares on its stack. linux-i386 has 4K stacks, by default. Using 2800 bytes out of 4K by a single