diff options
| -rw-r--r-- | include/linux/mm_types.h | 3 | ||||
| -rw-r--r-- | include/linux/sched.h | 5 | ||||
| -rw-r--r-- | kernel/sched/core.c | 1 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 29 | ||||
| -rw-r--r-- | kernel/sysctl.c | 7 | ||||
| -rw-r--r-- | mm/huge_memory.c | 2 | ||||
| -rw-r--r-- | mm/memory.c | 12 |
7 files changed, 44 insertions, 15 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index c5fffa2..e850a23 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -410,6 +410,9 @@ struct mm_struct { */ unsigned long numa_next_scan; + /* numa_next_reset is when the PTE scanner period will be reset */ + unsigned long numa_next_reset; + /* Restart point for scanning and setting pte_numa */ unsigned long numa_scan_offset; diff --git a/include/linux/sched.h b/include/linux/sched.h index 7d95a23..0f4ff2b 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1562,9 +1562,9 @@ struct task_struct { #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) #ifdef CONFIG_NUMA_BALANCING -extern void task_numa_fault(int node, int pages); +extern void task_numa_fault(int node, int pages, bool migrated); #else -static inline void task_numa_fault(int node, int pages) +static inline void task_numa_fault(int node, int pages, bool migrated) { } #endif @@ -2009,6 +2009,7 @@ extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; extern unsigned int sysctl_numa_balancing_scan_delay; extern unsigned int sysctl_numa_balancing_scan_period_min; extern unsigned int sysctl_numa_balancing_scan_period_max; +extern unsigned int sysctl_numa_balancing_scan_period_reset; extern unsigned int sysctl_numa_balancing_scan_size; extern unsigned int sysctl_numa_balancing_settle_count; diff --git a/kernel/sched/core.c b/kernel/sched/core.c index fbfc484..9d255bc 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1537,6 +1537,7 @@ static void __sched_fork(struct task_struct *p) #ifdef CONFIG_NUMA_BALANCING if (p->mm && atomic_read(&p->mm->mm_users) == 1) { p->mm->numa_next_scan = jiffies; + p->mm->numa_next_reset = jiffies; p->mm->numa_scan_seq = 0; } diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index dd18087..4b57786 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -784,7 +784,8 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se) * numa task sample period in ms */ unsigned int sysctl_numa_balancing_scan_period_min = 100; -unsigned int sysctl_numa_balancing_scan_period_max = 100*16; +unsigned int sysctl_numa_balancing_scan_period_max = 100*50; +unsigned int sysctl_numa_balancing_scan_period_reset = 100*600; /* Portion of address space to scan in MB */ unsigned int sysctl_numa_balancing_scan_size = 256; @@ -806,20 +807,19 @@ static void task_numa_placement(struct task_struct *p) /* * Got a PROT_NONE fault for a page on @node. */ -void task_numa_fault(int node, int pages) +void task_numa_fault(int node, int pages, bool migrated) { struct task_struct *p = current; /* FIXME: Allocate task-specific structure for placement policy here */ /* - * Assume that as faults occur that pages are getting properly placed - * and fewer NUMA hints are required. Note that this is a big - * assumption, it assumes processes reach a steady steady with no - * further phase changes. + * If pages are properly placed (did not migrate) then scan slower. + * This is reset periodically in case of phase changes */ - p->numa_scan_period = min(sysctl_numa_balancing_scan_period_max, - p->numa_scan_period + jiffies_to_msecs(2)); + if (!migrated) + p->numa_scan_period = min(sysctl_numa_balancing_scan_period_max, + p->numa_scan_period + jiffies_to_msecs(10)); task_numa_placement(p); } @@ -858,6 +858,19 @@ void task_numa_work(struct callback_head *work) return; /* + * Reset the scan period if enough time has gone by. Objective is that + * scanning will be reduced if pages are properly placed. As tasks + * can enter different phases this needs to be re-examined. Lacking + * proper tracking of reference behaviour, this blunt hammer is used. + */ + migrate = mm->numa_next_reset; + if (time_after(now, migrate)) { + p->numa_scan_period = sysctl_numa_balancing_scan_period_min; + next_scan = now + msecs_to_jiffies(sysctl_numa_balancing_scan_period_reset); + xchg(&mm->numa_next_reset, next_scan); + } + + /* * Enforce maximal scan/migration frequency.. */ migrate = mm->numa_next_scan; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 48a68cc..8906f90 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -367,6 +367,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "numa_balancing_scan_period_reset", + .data = &sysctl_numa_balancing_scan_period_reset, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { .procname = "numa_balancing_scan_period_max_ms", .data = &sysctl_numa_balancing_scan_period_max, .maxlen = sizeof(unsigned int), diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 79b9606..199b261 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1068,7 +1068,7 @@ out_unlock: spin_unlock(&mm->page_table_lock); if (page) { put_page(page); - task_numa_fault(numa_node_id(), HPAGE_PMD_NR); + task_numa_fault(numa_node_id(), HPAGE_PMD_NR, false); } return 0; } diff --git a/mm/memory.c b/mm/memory.c index 84c6d9e..39edb11 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3468,6 +3468,7 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, spinlock_t *ptl; int current_nid = -1; int target_nid; + bool migrated = false; /* * The "pte" at this point cannot be used safely without @@ -3509,12 +3510,13 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, } /* Migrate to the requested node */ - if (migrate_misplaced_page(page, target_nid)) + migrated = migrate_misplaced_page(page, target_nid); + if (migrated) current_nid = target_nid; out: if (current_nid != -1) - task_numa_fault(current_nid, 1); + task_numa_fault(current_nid, 1, migrated); return 0; } @@ -3554,6 +3556,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, struct page *page; int curr_nid = local_nid; int target_nid; + bool migrated; if (!pte_present(pteval)) continue; if (!pte_numa(pteval)) @@ -3590,9 +3593,10 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, /* Migrate to the requested node */ pte_unmap_unlock(pte, ptl); - if (migrate_misplaced_page(page, target_nid)) + migrated = migrate_misplaced_page(page, target_nid); + if (migrated) curr_nid = target_nid; - task_numa_fault(curr_nid, 1); + task_numa_fault(curr_nid, 1, migrated); pte = pte_offset_map_lock(mm, pmdp, addr, &ptl); } |
