search for: nohz_cpu_mask

..._stop_hz_timer(void) +{ + /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ + + unsigned long seq, next; + unsigned long long real_cycles_expiry; + int cpu = smp_processor_id(); + + /* Allow disabling via /proc/sys/kernel/hz_timer. */ + if (sysctl_hz_timer != 0) + return; + + /* Set nohz_cpu_mask, check rcu_pending in same order as S390. */ + cpu_set(cpu, nohz_cpu_mask); + if (rcu_pending(cpu) || local_softirq_pending()) { + cpu_clear(cpu, nohz_cpu_mask); + return; + } + + next = next_timer_interrupt(); + + if (jiffies + VMI_MIN_NO_IDLE_HZ_SKIPPED_TICKS >= next) { + cpu_clear(cpu, noh...

..._stop_hz_timer(void) +{ + /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ + + unsigned long seq, next; + unsigned long long real_cycles_expiry; + int cpu = smp_processor_id(); + + /* Allow disabling via /proc/sys/kernel/hz_timer. */ + if (sysctl_hz_timer != 0) + return; + + /* Set nohz_cpu_mask, check rcu_pending in same order as S390. */ + cpu_set(cpu, nohz_cpu_mask); + if (rcu_pending(cpu) || local_softirq_pending()) { + cpu_clear(cpu, nohz_cpu_mask); + return; + } + + next = next_timer_interrupt(); + + if (jiffies + VMI_MIN_NO_IDLE_HZ_SKIPPED_TICKS >= next) { + cpu_clear(cpu, noh...

...time_lock); } @@ -380,7 +377,6 @@ int vmi_stop_hz_timer(void) unsigned long seq, next; unsigned long long real_cycles_expiry; int cpu = smp_processor_id(); - int idle; BUG_ON(!irqs_disabled()); if (sysctl_hz_timer != 0) @@ -388,13 +384,13 @@ int vmi_stop_hz_timer(void) cpu_set(cpu, nohz_cpu_mask); smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || - (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + (next = next_timer_interrupt(), + time_before_eq(next, jiffies + HZ/CONFIG_VMI_ALARM_HZ))) { cpu_clear(cpu, nohz_cpu_mask); - next = jiffies...

...time_lock); } @@ -380,7 +377,6 @@ int vmi_stop_hz_timer(void) unsigned long seq, next; unsigned long long real_cycles_expiry; int cpu = smp_processor_id(); - int idle; BUG_ON(!irqs_disabled()); if (sysctl_hz_timer != 0) @@ -388,13 +384,13 @@ int vmi_stop_hz_timer(void) cpu_set(cpu, nohz_cpu_mask); smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || - (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + (next = next_timer_interrupt(), + time_before_eq(next, jiffies + HZ/CONFIG_VMI_ALARM_HZ))) { cpu_clear(cpu, nohz_cpu_mask); - next = jiffies...

...int vmi_stop_hz_timer(void) +{ + /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ + + unsigned long seq, next; + unsigned long long real_cycles_expiry; + int cpu = smp_processor_id(); + int idle; + + BUG_ON(!irqs_disabled()); + if (sysctl_hz_timer != 0) + return 0; + + cpu_set(cpu, nohz_cpu_mask); + smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || + (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + cpu_clear(cpu, nohz_cpu_mask); + next = jiffies; + idle = 0; + } else + idle = 1; + + /* Convert jiffies to the real cycle counter. */ + do { + seq = r...

...int vmi_stop_hz_timer(void) +{ + /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ + + unsigned long seq, next; + unsigned long long real_cycles_expiry; + int cpu = smp_processor_id(); + int idle; + + BUG_ON(!irqs_disabled()); + if (sysctl_hz_timer != 0) + return 0; + + cpu_set(cpu, nohz_cpu_mask); + smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || + (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + cpu_clear(cpu, nohz_cpu_mask); + next = jiffies; + idle = 0; + } else + idle = 1; + + /* Convert jiffies to the real cycle counter. */ + do { + seq = r...

...int vmi_stop_hz_timer(void) +{ + /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ + + unsigned long seq, next; + unsigned long long real_cycles_expiry; + int cpu = smp_processor_id(); + int idle; + + BUG_ON(!irqs_disabled()); + if (sysctl_hz_timer != 0) + return 0; + + cpu_set(cpu, nohz_cpu_mask); + smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || + (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + cpu_clear(cpu, nohz_cpu_mask); + next = jiffies; + idle = 0; + } else + idle = 1; + + /* Convert jiffies to the real cycle counter. */ + do { + seq = r...

...int vmi_stop_hz_timer(void) +{ + /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ + + unsigned long seq, next; + unsigned long long real_cycles_expiry; + int cpu = smp_processor_id(); + int idle; + + BUG_ON(!irqs_disabled()); + if (sysctl_hz_timer != 0) + return 0; + + cpu_set(cpu, nohz_cpu_mask); + smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || + (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + cpu_clear(cpu, nohz_cpu_mask); + next = jiffies; + idle = 0; + } else + idle = 1; + + /* Convert jiffies to the real cycle counter. */ + do { + seq = r...

...sabled. */ -int vmi_stop_hz_timer(void) -{ - /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ - - unsigned long seq, next; - unsigned long long real_cycles_expiry; - int cpu = smp_processor_id(); - - BUG_ON(!irqs_disabled()); - if (sysctl_hz_timer != 0) - return 0; - - cpu_set(cpu, nohz_cpu_mask); - smp_mb(); - - if (rcu_needs_cpu(cpu) || local_softirq_pending() || - (next = next_timer_interrupt(), - time_before_eq(next, jiffies + HZ/CONFIG_VMI_ALARM_HZ))) { - cpu_clear(cpu, nohz_cpu_mask); - return 0; - } - - /* Convert jiffies to the real cycle counter. */ - do { - seq = read...

...sabled. */ -int vmi_stop_hz_timer(void) -{ - /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */ - - unsigned long seq, next; - unsigned long long real_cycles_expiry; - int cpu = smp_processor_id(); - - BUG_ON(!irqs_disabled()); - if (sysctl_hz_timer != 0) - return 0; - - cpu_set(cpu, nohz_cpu_mask); - smp_mb(); - - if (rcu_needs_cpu(cpu) || local_softirq_pending() || - (next = next_timer_interrupt(), - time_before_eq(next, jiffies + HZ/CONFIG_VMI_ALARM_HZ))) { - cpu_clear(cpu, nohz_cpu_mask); - return 0; - } - - /* Convert jiffies to the real cycle counter. */ - do { - seq = read...

Here's couple of patches to improve the softlockup watchdog. The first changes the softlockup timer from using jiffies to sched_clock() as a timebase. Xen and VMI implement sched_clock() as counting unstolen time, so time stolen by the hypervisor won't cause the watchdog to bite. The second adds per-cpu enable flags for the watchdog timer. This allows the timer to be disabled when the

Here's couple of patches to improve the softlockup watchdog. The first changes the softlockup timer from using jiffies to sched_clock() as a timebase. Xen and VMI implement sched_clock() as counting unstolen time, so time stolen by the hypervisor won't cause the watchdog to bite. The second adds per-cpu enable flags for the watchdog timer. This allows the timer to be disabled when the

Hi Ingo, This series of patches implements a number of improvements to the softlockup watchdog and its users. They are: 1. Make the watchdog ignore stolen time When running under a hypervisor, the kernel may lose an arbitrary amount of time as "stolen time". This may cause the softlockup watchdog to trigger spruiously. Xen and VMI implement sched_clock() as measuring unstolen time,

Hi Ingo, This series of patches implements a number of improvements to the softlockup watchdog and its users. They are: 1. Make the watchdog ignore stolen time When running under a hypervisor, the kernel may lose an arbitrary amount of time as "stolen time". This may cause the softlockup watchdog to trigger spruiously. Xen and VMI implement sched_clock() as measuring unstolen time,

Hi Andi, This is a set of updates for the firstfloor patch queue. Quick rundown: revert-mm-x86_64-mm-account-for-module-percpu-space-separately-from-kernel-percpu.patch separate-module-percpu-space.patch Update the module percpu accounting patch fix-ff-allow-percpu-variables-to-be-page-aligned.patch Make sure the percpu memory allocation is page-aligned

Hi Andi, This is a set of updates for the firstfloor patch queue. Quick rundown: revert-mm-x86_64-mm-account-for-module-percpu-space-separately-from-kernel-percpu.patch separate-module-percpu-space.patch Update the module percpu accounting patch fix-ff-allow-percpu-variables-to-be-page-aligned.patch Make sure the percpu memory allocation is page-aligned

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. The features in implemented this patch series are: * domU only * UP and SMP guest support (NEW!) * dynamic ticks (NEW!) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes (non-PAE may be broken at the moment) * xen hvc console

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. The features in implemented this patch series are: * domU only * UP and SMP guest support (NEW!) * dynamic ticks (NEW!) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes (non-PAE may be broken at the moment) * xen hvc console

Hi Andi, This patch series implements the Linux Xen guest as a paravirt_ops backend. The features in implemented this patch series are: * domU only * UP and SMP guest support (NEW!) * dynamic ticks (NEW!) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes (non-PAE may be broken at the moment) * xen hvc console

This patch series implements the Linux Xen guest in terms of the paravirt-ops interface. The features in implemented this patch series are: * domU only * UP only (most code is SMP-safe, but there's no way to create a new vcpu) * writable pagetables, with late pinning/early unpinning (no shadow pagetable support) * supports both PAE and non-PAE modes * xen console * virtual block