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Release 4.18 mm/list_lru.c

Directory: mm
/*
 * Copyright (c) 2013 Red Hat, Inc. and Parallels Inc. All rights reserved.
 * Authors: David Chinner and Glauber Costa
 *
 * Generic LRU infrastructure
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/list_lru.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/memcontrol.h>

#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
static LIST_HEAD(list_lrus);
static DEFINE_MUTEX(list_lrus_mutex);


static void list_lru_register(struct list_lru *lru) { mutex_lock(&list_lrus_mutex); list_add(&lru->list, &list_lrus); mutex_unlock(&list_lrus_mutex); }

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Vladimir Davydov34100.00%1100.00%
Total34100.00%1100.00%


static void list_lru_unregister(struct list_lru *lru) { mutex_lock(&list_lrus_mutex); list_del(&lru->list); mutex_unlock(&list_lrus_mutex); }

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Vladimir Davydov31100.00%1100.00%
Total31100.00%1100.00%

#else
static void list_lru_register(struct list_lru *lru) { }

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Vladimir Davydov10100.00%1100.00%
Total10100.00%1100.00%


static void list_lru_unregister(struct list_lru *lru) { }

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Vladimir Davydov10100.00%1100.00%
Total10100.00%1100.00%

#endif /* CONFIG_MEMCG && !CONFIG_SLOB */ #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
static inline bool list_lru_memcg_aware(struct list_lru *lru) { /* * This needs node 0 to be always present, even * in the systems supporting sparse numa ids. */ return !!lru->node[0].memcg_lrus; }

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Vladimir Davydov2496.00%150.00%
Raghavendra K T14.00%150.00%
Total25100.00%2100.00%


static inline struct list_lru_one * list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) { struct list_lru_memcg *memcg_lrus; /* * Either lock or RCU protects the array of per cgroup lists * from relocation (see memcg_update_list_lru_node). */ memcg_lrus = rcu_dereference_check(nlru->memcg_lrus, lockdep_is_held(&nlru->lock)); if (memcg_lrus && idx >= 0) return memcg_lrus->lru[idx]; return &nlru->lru; }

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Vladimir Davydov4674.19%150.00%
Kirill Tkhai1625.81%150.00%
Total62100.00%2100.00%

static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr) { struct page *page; if (!memcg_kmem_enabled()) return NULL; page = virt_to_head_page(ptr); return page->mem_cgroup;
} static inline struct list_lru_one * list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) { struct mem_cgroup *memcg; if (!nlru->memcg_lrus) return &nlru->lru; memcg = mem_cgroup_from_kmem(ptr); if (!memcg) return &nlru->lru; return list_lru_from_memcg_idx(nlru, memcg_cache_id(memcg)); }

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Vladimir Davydov65100.00%2100.00%
Total65100.00%2100.00%

#else
static inline bool list_lru_memcg_aware(struct list_lru *lru) { return false; }

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Vladimir Davydov15100.00%1100.00%
Total15100.00%1100.00%


static inline struct list_lru_one * list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) { return &nlru->lru; }

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Vladimir Davydov23100.00%1100.00%
Total23100.00%1100.00%


static inline struct list_lru_one * list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) { return &nlru->lru; }

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Vladimir Davydov24100.00%1100.00%
Total24100.00%1100.00%

#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
bool list_lru_add(struct list_lru *lru, struct list_head *item) { int nid = page_to_nid(virt_to_page(item)); struct list_lru_node *nlru = &lru->node[nid]; struct list_lru_one *l; spin_lock(&nlru->lock); if (list_empty(item)) { l = list_lru_from_kmem(nlru, item); list_add_tail(item, &l->list); l->nr_items++; nlru->nr_items++; spin_unlock(&nlru->lock); return true; } spin_unlock(&nlru->lock); return false; }

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PersonTokensPropCommitsCommitProp
Dave Chinner8575.89%240.00%
Vladimir Davydov1412.50%120.00%
Jeff Layton87.14%120.00%
Sahitya Tummala54.46%120.00%
Total112100.00%5100.00%

EXPORT_SYMBOL_GPL(list_lru_add);
bool list_lru_del(struct list_lru *lru, struct list_head *item) { int nid = page_to_nid(virt_to_page(item)); struct list_lru_node *nlru = &lru->node[nid]; struct list_lru_one *l; spin_lock(&nlru->lock); if (!list_empty(item)) { l = list_lru_from_kmem(nlru, item); list_del_init(item); l->nr_items--; nlru->nr_items--; spin_unlock(&nlru->lock); return true; } spin_unlock(&nlru->lock); return false; }

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PersonTokensPropCommitsCommitProp
Dave Chinner8780.56%233.33%
Jeff Layton98.33%116.67%
Vladimir Davydov76.48%233.33%
Sahitya Tummala54.63%116.67%
Total108100.00%6100.00%

EXPORT_SYMBOL_GPL(list_lru_del);
void list_lru_isolate(struct list_lru_one *list, struct list_head *item) { list_del_init(item); list->nr_items--; }

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Vladimir Davydov25100.00%1100.00%
Total25100.00%1100.00%

EXPORT_SYMBOL_GPL(list_lru_isolate);
void list_lru_isolate_move(struct list_lru_one *list, struct list_head *item, struct list_head *head) { list_move(item, head); list->nr_items--; }

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Vladimir Davydov32100.00%1100.00%
Total32100.00%1100.00%

EXPORT_SYMBOL_GPL(list_lru_isolate_move);
static unsigned long __list_lru_count_one(struct list_lru *lru, int nid, int memcg_idx) { struct list_lru_node *nlru = &lru->node[nid]; struct list_lru_one *l; unsigned long count; rcu_read_lock(); l = list_lru_from_memcg_idx(nlru, memcg_idx); count = l->nr_items; rcu_read_unlock(); return count; }

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PersonTokensPropCommitsCommitProp
Dave Chinner3453.12%240.00%
Vladimir Davydov2335.94%120.00%
Kirill Tkhai46.25%120.00%
Glauber de Oliveira Costa34.69%120.00%
Total64100.00%5100.00%


unsigned long list_lru_count_one(struct list_lru *lru, int nid, struct mem_cgroup *memcg) { return __list_lru_count_one(lru, nid, memcg_cache_id(memcg)); }

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Vladimir Davydov32100.00%1100.00%
Total32100.00%1100.00%

EXPORT_SYMBOL_GPL(list_lru_count_one);
unsigned long list_lru_count_node(struct list_lru *lru, int nid) { struct list_lru_node *nlru; nlru = &lru->node[nid]; return nlru->nr_items; }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov2058.82%150.00%
Sahitya Tummala1441.18%150.00%
Total34100.00%2100.00%

EXPORT_SYMBOL_GPL(list_lru_count_node);
static unsigned long __list_lru_walk_one(struct list_lru *lru, int nid, int memcg_idx, list_lru_walk_cb isolate, void *cb_arg, unsigned long *nr_to_walk) { struct list_lru_node *nlru = &lru->node[nid]; struct list_lru_one *l; struct list_head *item, *n; unsigned long isolated = 0; spin_lock(&nlru->lock); l = list_lru_from_memcg_idx(nlru, memcg_idx); restart: list_for_each_safe(item, n, &l->list) { enum lru_status ret; /* * decrement nr_to_walk first so that we don't livelock if we * get stuck on large numbesr of LRU_RETRY items */ if (!*nr_to_walk) break; --*nr_to_walk; ret = isolate(item, l, &nlru->lock, cb_arg); switch (ret) { case LRU_REMOVED_RETRY: assert_spin_locked(&nlru->lock); /* fall through */ case LRU_REMOVED: isolated++; nlru->nr_items--; /* * If the lru lock has been dropped, our list * traversal is now invalid and so we have to * restart from scratch. */ if (ret == LRU_REMOVED_RETRY) goto restart; break; case LRU_ROTATE: list_move_tail(item, &l->list); break; case LRU_SKIP: break; case LRU_RETRY: /* * The lru lock has been dropped, our list traversal is * now invalid and so we have to restart from scratch. */ assert_spin_locked(&nlru->lock); goto restart; default: BUG(); } } spin_unlock(&nlru->lock); return isolated; }

Contributors

PersonTokensPropCommitsCommitProp
Dave Chinner14870.14%333.33%
Johannes Weiner2913.74%111.11%
Vladimir Davydov2310.90%222.22%
Sahitya Tummala52.37%111.11%
Russell King52.37%111.11%
Gustavo A. R. Silva10.47%111.11%
Total211100.00%9100.00%


unsigned long list_lru_walk_one(struct list_lru *lru, int nid, struct mem_cgroup *memcg, list_lru_walk_cb isolate, void *cb_arg, unsigned long *nr_to_walk) { return __list_lru_walk_one(lru, nid, memcg_cache_id(memcg), isolate, cb_arg, nr_to_walk); }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov50100.00%1100.00%
Total50100.00%1100.00%

EXPORT_SYMBOL_GPL(list_lru_walk_one);
unsigned long list_lru_walk_node(struct list_lru *lru, int nid, list_lru_walk_cb isolate, void *cb_arg, unsigned long *nr_to_walk) { long isolated = 0; int memcg_idx; isolated += __list_lru_walk_one(lru, nid, -1, isolate, cb_arg, nr_to_walk); if (*nr_to_walk > 0 && list_lru_memcg_aware(lru)) { for_each_memcg_cache_index(memcg_idx) { isolated += __list_lru_walk_one(lru, nid, memcg_idx, isolate, cb_arg, nr_to_walk); if (*nr_to_walk <= 0) break; } } return isolated; }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov7777.00%120.00%
Glauber de Oliveira Costa1212.00%120.00%
Dave Chinner99.00%240.00%
Johannes Weiner22.00%120.00%
Total100100.00%5100.00%

EXPORT_SYMBOL_GPL(list_lru_walk_node);
static void init_one_lru(struct list_lru_one *l) { INIT_LIST_HEAD(&l->list); l->nr_items = 0; }

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Vladimir Davydov25100.00%1100.00%
Total25100.00%1100.00%

#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
static void __memcg_destroy_list_lru_node(struct list_lru_memcg *memcg_lrus, int begin, int end) { int i; for (i = begin; i < end; i++) kfree(memcg_lrus->lru[i]); }

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Vladimir Davydov43100.00%1100.00%
Total43100.00%1100.00%


static int __memcg_init_list_lru_node(struct list_lru_memcg *memcg_lrus, int begin, int end) { int i; for (i = begin; i < end; i++) { struct list_lru_one *l; l = kmalloc(sizeof(struct list_lru_one), GFP_KERNEL); if (!l) goto fail; init_one_lru(l); memcg_lrus->lru[i] = l; } return 0; fail: __memcg_destroy_list_lru_node(memcg_lrus, begin, i - 1); return -ENOMEM; }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov95100.00%1100.00%
Total95100.00%1100.00%


static int memcg_init_list_lru_node(struct list_lru_node *nlru) { struct list_lru_memcg *memcg_lrus; int size = memcg_nr_cache_ids; memcg_lrus = kvmalloc(sizeof(*memcg_lrus) + size * sizeof(void *), GFP_KERNEL); if (!memcg_lrus) return -ENOMEM; if (__memcg_init_list_lru_node(memcg_lrus, 0, size)) { kvfree(memcg_lrus); return -ENOMEM; } RCU_INIT_POINTER(nlru->memcg_lrus, memcg_lrus); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov6374.12%133.33%
Kirill Tkhai2023.53%133.33%
Johannes Weiner22.35%133.33%
Total85100.00%3100.00%


static void memcg_destroy_list_lru_node(struct list_lru_node *nlru) { struct list_lru_memcg *memcg_lrus; /* * This is called when shrinker has already been unregistered, * and nobody can use it. So, there is no need to use kvfree_rcu(). */ memcg_lrus = rcu_dereference_protected(nlru->memcg_lrus, true); __memcg_destroy_list_lru_node(memcg_lrus, 0, memcg_nr_cache_ids); kvfree(memcg_lrus); }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov2559.52%133.33%
Kirill Tkhai1638.10%133.33%
Johannes Weiner12.38%133.33%
Total42100.00%3100.00%


static void kvfree_rcu(struct rcu_head *head) { struct list_lru_memcg *mlru; mlru = container_of(head, struct list_lru_memcg, rcu); kvfree(mlru); }

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PersonTokensPropCommitsCommitProp
Kirill Tkhai33100.00%1100.00%
Total33100.00%1100.00%


static int memcg_update_list_lru_node(struct list_lru_node *nlru, int old_size, int new_size) { struct list_lru_memcg *old, *new; BUG_ON(old_size > new_size); old = rcu_dereference_protected(nlru->memcg_lrus, lockdep_is_held(&list_lrus_mutex)); new = kvmalloc(sizeof(*new) + new_size * sizeof(void *), GFP_KERNEL); if (!new) return -ENOMEM; if (__memcg_init_list_lru_node(new, old_size, new_size)) { kvfree(new); return -ENOMEM; } memcpy(&new->lru, &old->lru, old_size * sizeof(void *)); /* * The locking below allows readers that hold nlru->lock avoid taking * rcu_read_lock (see list_lru_from_memcg_idx). * * Since list_lru_{add,del} may be called under an IRQ-safe lock, * we have to use IRQ-safe primitives here to avoid deadlock. */ spin_lock_irq(&nlru->lock); rcu_assign_pointer(nlru->memcg_lrus, new); spin_unlock_irq(&nlru->lock); call_rcu(&old->rcu, kvfree_rcu); return 0; }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov12578.62%133.33%
Kirill Tkhai3220.13%133.33%
Johannes Weiner21.26%133.33%
Total159100.00%3100.00%


static void memcg_cancel_update_list_lru_node(struct list_lru_node *nlru, int old_size, int new_size) { struct list_lru_memcg *memcg_lrus; memcg_lrus = rcu_dereference_protected(nlru->memcg_lrus, lockdep_is_held(&list_lrus_mutex)); /* do not bother shrinking the array back to the old size, because we * cannot handle allocation failures here */ __memcg_destroy_list_lru_node(memcg_lrus, old_size, new_size); }

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Vladimir Davydov2757.45%150.00%
Kirill Tkhai2042.55%150.00%
Total47100.00%2100.00%


static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) { int i; if (!memcg_aware) return 0; for_each_node(i) { if (memcg_init_list_lru_node(&lru->node[i])) goto fail; } return 0; fail: for (i = i - 1; i >= 0; i--) { if (!lru->node[i].memcg_lrus) continue; memcg_destroy_list_lru_node(&lru->node[i]); } return -ENOMEM; }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov7476.29%150.00%
Raghavendra K T2323.71%150.00%
Total97100.00%2100.00%


static void memcg_destroy_list_lru(struct list_lru *lru) { int i; if (!list_lru_memcg_aware(lru)) return; for_each_node(i) memcg_destroy_list_lru_node(&lru->node[i]); }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov3489.47%150.00%
Raghavendra K T410.53%150.00%
Total38100.00%2100.00%


static int memcg_update_list_lru(struct list_lru *lru, int old_size, int new_size) { int i; if (!list_lru_memcg_aware(lru)) return 0; for_each_node(i) { if (memcg_update_list_lru_node(&lru->node[i], old_size, new_size)) goto fail; } return 0; fail: for (i = i - 1; i >= 0; i--) { if (!lru->node[i].memcg_lrus) continue; memcg_cancel_update_list_lru_node(&lru->node[i], old_size, new_size); } return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov9081.08%133.33%
Raghavendra K T1917.12%133.33%
Glauber de Oliveira Costa21.80%133.33%
Total111100.00%3100.00%


static void memcg_cancel_update_list_lru(struct list_lru *lru, int old_size, int new_size) { int i; if (!list_lru_memcg_aware(lru)) return; for_each_node(i) memcg_cancel_update_list_lru_node(&lru->node[i], old_size, new_size); }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov4491.67%150.00%
Raghavendra K T48.33%150.00%
Total48100.00%2100.00%


int memcg_update_all_list_lrus(int new_size) { int ret = 0; struct list_lru *lru; int old_size = memcg_nr_cache_ids; mutex_lock(&list_lrus_mutex); list_for_each_entry(lru, &list_lrus, list) { ret = memcg_update_list_lru(lru, old_size, new_size); if (ret) goto fail; } out: mutex_unlock(&list_lrus_mutex); return ret; fail: list_for_each_entry_continue_reverse(lru, &list_lrus, list) memcg_cancel_update_list_lru(lru, old_size, new_size); goto out; }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov90100.00%1100.00%
Total90100.00%1100.00%


static void memcg_drain_list_lru_node(struct list_lru_node *nlru, int src_idx, int dst_idx) { struct list_lru_one *src, *dst; /* * Since list_lru_{add,del} may be called under an IRQ-safe lock, * we have to use IRQ-safe primitives here to avoid deadlock. */ spin_lock_irq(&nlru->lock); src = list_lru_from_memcg_idx(nlru, src_idx); dst = list_lru_from_memcg_idx(nlru, dst_idx); list_splice_init(&src->list, &dst->list); dst->nr_items += src->nr_items; src->nr_items = 0; spin_unlock_irq(&nlru->lock); }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov87100.00%1100.00%
Total87100.00%1100.00%


static void memcg_drain_list_lru(struct list_lru *lru, int src_idx, int dst_idx) { int i; if (!list_lru_memcg_aware(lru)) return; for_each_node(i) memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_idx); }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov4491.67%150.00%
Raghavendra K T48.33%150.00%
Total48100.00%2100.00%


void memcg_drain_all_list_lrus(int src_idx, int dst_idx) { struct list_lru *lru; mutex_lock(&list_lrus_mutex); list_for_each_entry(lru, &list_lrus, list) memcg_drain_list_lru(lru, src_idx, dst_idx); mutex_unlock(&list_lrus_mutex); }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov45100.00%1100.00%
Total45100.00%1100.00%

#else
static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) { return 0; }

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Vladimir Davydov17100.00%1100.00%
Total17100.00%1100.00%


static void memcg_destroy_list_lru(struct list_lru *lru) { }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov10100.00%1100.00%
Total10100.00%1100.00%

#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
int __list_lru_init(struct list_lru *lru, bool memcg_aware, struct lock_class_key *key) { int i; size_t size = sizeof(*lru->node) * nr_node_ids; int err = -ENOMEM; memcg_get_cache_ids(); lru->node = kzalloc(size, GFP_KERNEL); if (!lru->node) goto out; for_each_node(i) { spin_lock_init(&lru->node[i].lock); if (key) lockdep_set_class(&lru->node[i].lock, key); init_one_lru(&lru->node[i].lru); } err = memcg_init_list_lru(lru, memcg_aware); if (err) { kfree(lru->node); /* Do this so a list_lru_destroy() doesn't crash: */ lru->node = NULL; goto out; } list_lru_register(lru); out: memcg_put_cache_ids(); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov9760.62%228.57%
Dave Chinner3320.62%228.57%
Johannes Weiner1911.88%114.29%
Alexander Polakov74.38%114.29%
Raghavendra K T42.50%114.29%
Total160100.00%7100.00%

EXPORT_SYMBOL_GPL(__list_lru_init);
void list_lru_destroy(struct list_lru *lru) { /* Already destroyed or not yet initialized? */ if (!lru->node) return; memcg_get_cache_ids(); list_lru_unregister(lru); memcg_destroy_list_lru(lru); kfree(lru->node); lru->node = NULL; memcg_put_cache_ids(); }

Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov3164.58%266.67%
Glauber de Oliveira Costa1735.42%133.33%
Total48100.00%3100.00%

EXPORT_SYMBOL_GPL(list_lru_destroy);

Overall Contributors

PersonTokensPropCommitsCommitProp
Vladimir Davydov173867.76%628.57%
Dave Chinner43116.80%314.29%
Kirill Tkhai1415.50%14.76%
Johannes Weiner943.66%314.29%
Raghavendra K T592.30%14.76%
Glauber de Oliveira Costa431.68%29.52%
Sahitya Tummala291.13%14.76%
Jeff Layton170.66%14.76%
Alexander Polakov70.27%14.76%
Russell King50.19%14.76%
Gustavo A. R. Silva10.04%14.76%
Total2565100.00%21100.00%
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