diff options
Diffstat (limited to '0074-xen-sched-fix-restore_vcpu_affinity-by-removing-it.patch')
| -rw-r--r-- | 0074-xen-sched-fix-restore_vcpu_affinity-by-removing-it.patch | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/0074-xen-sched-fix-restore_vcpu_affinity-by-removing-it.patch b/0074-xen-sched-fix-restore_vcpu_affinity-by-removing-it.patch deleted file mode 100644 index 9085f67..0000000 --- a/0074-xen-sched-fix-restore_vcpu_affinity-by-removing-it.patch +++ /dev/null @@ -1,158 +0,0 @@ -From 9c5114696c6f7773b7f3691f27aaa7a0636c916d Mon Sep 17 00:00:00 2001 -From: Juergen Gross <jgross@suse.com> -Date: Mon, 31 Oct 2022 13:34:28 +0100 -Subject: [PATCH 074/126] xen/sched: fix restore_vcpu_affinity() by removing it -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -When the system is coming up after having been suspended, -restore_vcpu_affinity() is called for each domain in order to adjust -the vcpu's affinity settings in case a cpu didn't come to live again. - -The way restore_vcpu_affinity() is doing that is wrong, because the -specific scheduler isn't being informed about a possible migration of -the vcpu to another cpu. Additionally the migration is often even -happening if all cpus are running again, as it is done without check -whether it is really needed. - -As cpupool management is already calling cpu_disable_scheduler() for -cpus not having come up again, and cpu_disable_scheduler() is taking -care of eventually needed vcpu migration in the proper way, there is -simply no need for restore_vcpu_affinity(). - -So just remove restore_vcpu_affinity() completely, together with the -no longer used sched_reset_affinity_broken(). - -Fixes: 8a04eaa8ea83 ("xen/sched: move some per-vcpu items to struct sched_unit") -Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> -Signed-off-by: Juergen Gross <jgross@suse.com> -Acked-by: Dario Faggioli <dfaggioli@suse.com> -Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> -master commit: fce1f381f7388daaa3e96dbb0d67d7a3e4bb2d2d -master date: 2022-10-24 11:16:27 +0100 ---- - xen/arch/x86/acpi/power.c | 3 -- - xen/common/sched/core.c | 78 --------------------------------------- - xen/include/xen/sched.h | 1 - - 3 files changed, 82 deletions(-) - -diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c -index dd397f713067..1a7baeebe6d0 100644 ---- a/xen/arch/x86/acpi/power.c -+++ b/xen/arch/x86/acpi/power.c -@@ -159,10 +159,7 @@ static void thaw_domains(void) - - rcu_read_lock(&domlist_read_lock); - for_each_domain ( d ) -- { -- restore_vcpu_affinity(d); - domain_unpause(d); -- } - rcu_read_unlock(&domlist_read_lock); - } - -diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c -index 900aab8f66a7..9173cf690c72 100644 ---- a/xen/common/sched/core.c -+++ b/xen/common/sched/core.c -@@ -1188,84 +1188,6 @@ static bool sched_check_affinity_broken(const struct sched_unit *unit) - return false; - } - --static void sched_reset_affinity_broken(const struct sched_unit *unit) --{ -- struct vcpu *v; -- -- for_each_sched_unit_vcpu ( unit, v ) -- v->affinity_broken = false; --} -- --void restore_vcpu_affinity(struct domain *d) --{ -- unsigned int cpu = smp_processor_id(); -- struct sched_unit *unit; -- -- ASSERT(system_state == SYS_STATE_resume); -- -- rcu_read_lock(&sched_res_rculock); -- -- for_each_sched_unit ( d, unit ) -- { -- spinlock_t *lock; -- unsigned int old_cpu = sched_unit_master(unit); -- struct sched_resource *res; -- -- ASSERT(!unit_runnable(unit)); -- -- /* -- * Re-assign the initial processor as after resume we have no -- * guarantee the old processor has come back to life again. -- * -- * Therefore, here, before actually unpausing the domains, we should -- * set v->processor of each of their vCPUs to something that will -- * make sense for the scheduler of the cpupool in which they are in. -- */ -- lock = unit_schedule_lock_irq(unit); -- -- cpumask_and(cpumask_scratch_cpu(cpu), unit->cpu_hard_affinity, -- cpupool_domain_master_cpumask(d)); -- if ( cpumask_empty(cpumask_scratch_cpu(cpu)) ) -- { -- if ( sched_check_affinity_broken(unit) ) -- { -- sched_set_affinity(unit, unit->cpu_hard_affinity_saved, NULL); -- sched_reset_affinity_broken(unit); -- cpumask_and(cpumask_scratch_cpu(cpu), unit->cpu_hard_affinity, -- cpupool_domain_master_cpumask(d)); -- } -- -- if ( cpumask_empty(cpumask_scratch_cpu(cpu)) ) -- { -- /* Affinity settings of one vcpu are for the complete unit. */ -- printk(XENLOG_DEBUG "Breaking affinity for %pv\n", -- unit->vcpu_list); -- sched_set_affinity(unit, &cpumask_all, NULL); -- cpumask_and(cpumask_scratch_cpu(cpu), unit->cpu_hard_affinity, -- cpupool_domain_master_cpumask(d)); -- } -- } -- -- res = get_sched_res(cpumask_any(cpumask_scratch_cpu(cpu))); -- sched_set_res(unit, res); -- -- spin_unlock_irq(lock); -- -- /* v->processor might have changed, so reacquire the lock. */ -- lock = unit_schedule_lock_irq(unit); -- res = sched_pick_resource(unit_scheduler(unit), unit); -- sched_set_res(unit, res); -- spin_unlock_irq(lock); -- -- if ( old_cpu != sched_unit_master(unit) ) -- sched_move_irqs(unit); -- } -- -- rcu_read_unlock(&sched_res_rculock); -- -- domain_update_node_affinity(d); --} -- - /* - * This function is used by cpu_hotplug code via cpu notifier chain - * and from cpupools to switch schedulers on a cpu. -diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h -index 4e25627d9685..bb05d167ae0f 100644 ---- a/xen/include/xen/sched.h -+++ b/xen/include/xen/sched.h -@@ -993,7 +993,6 @@ void vcpu_set_periodic_timer(struct vcpu *v, s_time_t value); - void sched_setup_dom0_vcpus(struct domain *d); - int vcpu_temporary_affinity(struct vcpu *v, unsigned int cpu, uint8_t reason); - int vcpu_set_hard_affinity(struct vcpu *v, const cpumask_t *affinity); --void restore_vcpu_affinity(struct domain *d); - int vcpu_affinity_domctl(struct domain *d, uint32_t cmd, - struct xen_domctl_vcpuaffinity *vcpuaff); - --- -2.37.4 - |