@@ -1005,6 +1005,7 @@ static int exec_mmap(struct mm_struct *mm)
active_mm = tsk->active_mm;
tsk->active_mm = mm;
tsk->mm = mm;
+ lru_gen_add_mm(mm);
/*
* This prevents preemption while active_mm is being loaded and
* it and mm are being updated, which could cause problems for
@@ -1015,6 +1016,7 @@ static int exec_mmap(struct mm_struct *mm)
if (!IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
local_irq_enable();
activate_mm(active_mm, mm);
+ lru_gen_use_mm(mm);
if (IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
local_irq_enable();
tsk->mm->vmacache_seqnum = 0;
@@ -340,6 +340,11 @@ struct mem_cgroup {
struct deferred_split deferred_split_queue;
#endif
+#ifdef CONFIG_LRU_GEN
+ /* per-memcg mm_struct list */
+ struct lru_gen_mm_list mm_list;
+#endif
+
struct mem_cgroup_per_node *nodeinfo[];
};
@@ -110,6 +110,11 @@ static inline int lru_gen_from_seq(unsigned long seq)
return seq % MAX_NR_GENS;
}
+static inline int lru_hist_from_seq(unsigned long seq)
+{
+ return seq % NR_HIST_GENS;
+}
+
static inline bool lru_gen_is_active(struct lruvec *lruvec, int gen)
{
unsigned long max_seq = lruvec->lrugen.max_seq;
@@ -3,6 +3,7 @@
#define _LINUX_MM_TYPES_H
#include <linux/mm_types_task.h>
+#include <linux/sched.h>
#include <linux/auxvec.h>
#include <linux/list.h>
@@ -16,6 +17,8 @@
#include <linux/page-flags-layout.h>
#include <linux/workqueue.h>
#include <linux/seqlock.h>
+#include <linux/nodemask.h>
+#include <linux/mmdebug.h>
#include <asm/mmu.h>
@@ -646,6 +649,22 @@ struct mm_struct {
#ifdef CONFIG_IOMMU_SUPPORT
u32 pasid;
#endif
+#ifdef CONFIG_LRU_GEN
+ struct {
+ /* this mm_struct is on lru_gen_mm_list */
+ struct list_head list;
+#ifdef CONFIG_MEMCG
+ /* points to the memcg of "owner" above */
+ struct mem_cgroup *memcg;
+#endif
+ /*
+ * Set when switching to this mm_struct, as a hint of
+ * whether it has been used since the last time per-node
+ * page table walkers cleared the corresponding bits.
+ */
+ nodemask_t nodes;
+ } lru_gen;
+#endif /* CONFIG_LRU_GEN */
} __randomize_layout;
/*
@@ -672,6 +691,65 @@ static inline cpumask_t *mm_cpumask(struct mm_struct *mm)
return (struct cpumask *)&mm->cpu_bitmap;
}
+#ifdef CONFIG_LRU_GEN
+
+struct lru_gen_mm_list {
+ /* mm_struct list for page table walkers */
+ struct list_head fifo;
+ /* protects the list above */
+ spinlock_t lock;
+};
+
+void lru_gen_add_mm(struct mm_struct *mm);
+void lru_gen_del_mm(struct mm_struct *mm);
+#ifdef CONFIG_MEMCG
+void lru_gen_migrate_mm(struct mm_struct *mm);
+#endif
+
+static inline void lru_gen_init_mm(struct mm_struct *mm)
+{
+ INIT_LIST_HEAD(&mm->lru_gen.list);
+#ifdef CONFIG_MEMCG
+ mm->lru_gen.memcg = NULL;
+#endif
+ nodes_clear(mm->lru_gen.nodes);
+}
+
+static inline void lru_gen_use_mm(struct mm_struct *mm)
+{
+ /* unlikely but not a bug when racing with lru_gen_migrate_mm() */
+ VM_WARN_ON(list_empty(&mm->lru_gen.list));
+
+ if (!(current->flags & PF_KTHREAD) && !nodes_full(mm->lru_gen.nodes))
+ nodes_setall(mm->lru_gen.nodes);
+}
+
+#else /* !CONFIG_LRU_GEN */
+
+static inline void lru_gen_add_mm(struct mm_struct *mm)
+{
+}
+
+static inline void lru_gen_del_mm(struct mm_struct *mm)
+{
+}
+
+#ifdef CONFIG_MEMCG
+static inline void lru_gen_migrate_mm(struct mm_struct *mm)
+{
+}
+#endif
+
+static inline void lru_gen_init_mm(struct mm_struct *mm)
+{
+}
+
+static inline void lru_gen_use_mm(struct mm_struct *mm)
+{
+}
+
+#endif /* CONFIG_LRU_GEN */
+
struct mmu_gather;
extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm);
extern void tlb_gather_mmu_fullmm(struct mmu_gather *tlb, struct mm_struct *mm);
@@ -335,6 +335,13 @@ struct lruvec;
#define MIN_NR_GENS 2U
#define MAX_NR_GENS ((unsigned int)CONFIG_NR_LRU_GENS)
+/* whether to keep historical stats for evicted generations */
+#ifdef CONFIG_LRU_GEN_STATS
+#define NR_HIST_GENS ((unsigned int)CONFIG_NR_LRU_GENS)
+#else
+#define NR_HIST_GENS 1U
+#endif
+
struct lru_gen_struct {
/* the aging increments the youngest generation number */
unsigned long max_seq;
@@ -350,6 +357,58 @@ struct lru_gen_struct {
bool enabled;
};
+enum {
+ MM_PTE_TOTAL, /* total leaf entries */
+ MM_PTE_OLD, /* old leaf entries */
+ MM_PTE_YOUNG, /* young leaf entries */
+ MM_PMD_TOTAL, /* total non-leaf entries */
+ MM_PMD_FOUND, /* non-leaf entries found in Bloom filters */
+ MM_PMD_ADDED, /* non-leaf entries added to Bloom filters */
+ NR_MM_STATS
+};
+
+/* mnemonic codes for the mm stats above */
+#define MM_STAT_CODES "toydfa"
+
+/* double-buffering Bloom filters */
+#define NR_BLOOM_FILTERS 2
+
+struct lru_gen_mm_state {
+ /* set to max_seq after each iteration */
+ unsigned long seq;
+ /* where the current iteration starts (inclusive) */
+ struct list_head *head;
+ /* where the last iteration ends (exclusive) */
+ struct list_head *tail;
+ /* to wait for the last page table walker to finish */
+ struct wait_queue_head wait;
+ /* Bloom filters flip after each iteration */
+ unsigned long *filters[NR_BLOOM_FILTERS];
+ /* the mm stats for debugging */
+ unsigned long stats[NR_HIST_GENS][NR_MM_STATS];
+ /* the number of concurrent page table walkers */
+ int nr_walkers;
+};
+
+struct lru_gen_mm_walk {
+ /* the lruvec under reclaim */
+ struct lruvec *lruvec;
+ /* unstable max_seq from lru_gen_struct */
+ unsigned long max_seq;
+ /* the next address within an mm to scan */
+ unsigned long next_addr;
+ /* to batch page table entries */
+ unsigned long bitmap[BITS_TO_LONGS(MIN_LRU_BATCH)];
+ /* to batch promoted pages */
+ int nr_pages[MAX_NR_GENS][ANON_AND_FILE][MAX_NR_ZONES];
+ /* to batch the mm stats */
+ int mm_stats[NR_MM_STATS];
+ /* total batched items */
+ int batched;
+ bool can_swap;
+ bool full_scan;
+};
+
void lru_gen_init_state(struct mem_cgroup *memcg, struct lruvec *lruvec);
#ifdef CONFIG_MEMCG
@@ -395,6 +454,8 @@ struct lruvec {
#ifdef CONFIG_LRU_GEN
/* evictable pages divided into generations */
struct lru_gen_struct lrugen;
+ /* to concurrently iterate lru_gen_mm_list */
+ struct lru_gen_mm_state mm_state;
#endif
#ifdef CONFIG_MEMCG
struct pglist_data *pgdat;
@@ -463,6 +463,7 @@ void mm_update_next_owner(struct mm_struct *mm)
goto retry;
}
WRITE_ONCE(mm->owner, c);
+ lru_gen_migrate_mm(mm);
task_unlock(c);
put_task_struct(c);
}
@@ -1078,6 +1078,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
goto fail_nocontext;
mm->user_ns = get_user_ns(user_ns);
+ lru_gen_init_mm(mm);
return mm;
fail_nocontext:
@@ -1120,6 +1121,7 @@ static inline void __mmput(struct mm_struct *mm)
}
if (mm->binfmt)
module_put(mm->binfmt->module);
+ lru_gen_del_mm(mm);
mmdrop(mm);
}
@@ -2603,6 +2605,13 @@ pid_t kernel_clone(struct kernel_clone_args *args)
get_task_struct(p);
}
+ if (IS_ENABLED(CONFIG_LRU_GEN) && !(clone_flags & CLONE_VM)) {
+ /* lock the task to synchronize with memcg migration */
+ task_lock(p);
+ lru_gen_add_mm(p->mm);
+ task_unlock(p);
+ }
+
wake_up_new_task(p);
/* forking complete and child started to run, tell ptracer */
@@ -4956,6 +4956,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
* finish_task_switch()'s mmdrop().
*/
switch_mm_irqs_off(prev->active_mm, next->mm, next);
+ lru_gen_use_mm(next->mm);
if (!prev->mm) { // from kernel
/* will mmdrop() in finish_task_switch(). */
@@ -6135,6 +6135,29 @@ static void mem_cgroup_move_task(void)
}
#endif
+#ifdef CONFIG_LRU_GEN
+static void mem_cgroup_attach(struct cgroup_taskset *tset)
+{
+ struct cgroup_subsys_state *css;
+ struct task_struct *task = NULL;
+
+ cgroup_taskset_for_each_leader(task, css, tset)
+ break;
+
+ if (!task)
+ return;
+
+ task_lock(task);
+ if (task->mm && task->mm->owner == task)
+ lru_gen_migrate_mm(task->mm);
+ task_unlock(task);
+}
+#else
+static void mem_cgroup_attach(struct cgroup_taskset *tset)
+{
+}
+#endif /* CONFIG_LRU_GEN */
+
static int seq_puts_memcg_tunable(struct seq_file *m, unsigned long value)
{
if (value == PAGE_COUNTER_MAX)
@@ -6478,6 +6501,7 @@ struct cgroup_subsys memory_cgrp_subsys = {
.css_reset = mem_cgroup_css_reset,
.css_rstat_flush = mem_cgroup_css_rstat_flush,
.can_attach = mem_cgroup_can_attach,
+ .attach = mem_cgroup_attach,
.cancel_attach = mem_cgroup_cancel_attach,
.post_attach = mem_cgroup_move_task,
.dfl_cftypes = memory_files,
@@ -3095,6 +3095,342 @@ static bool __maybe_unused seq_is_valid(struct lruvec *lruvec)
get_nr_gens(lruvec, 0) <= MAX_NR_GENS;
}
+/******************************************************************************
+ * mm_struct list
+ ******************************************************************************/
+
+static struct lru_gen_mm_list *get_mm_list(struct mem_cgroup *memcg)
+{
+ static struct lru_gen_mm_list mm_list = {
+ .fifo = LIST_HEAD_INIT(mm_list.fifo),
+ .lock = __SPIN_LOCK_UNLOCKED(mm_list.lock),
+ };
+
+#ifdef CONFIG_MEMCG
+ if (memcg)
+ return &memcg->mm_list;
+#endif
+ return &mm_list;
+}
+
+void lru_gen_add_mm(struct mm_struct *mm)
+{
+ int nid;
+ struct mem_cgroup *memcg = get_mem_cgroup_from_mm(mm);
+ struct lru_gen_mm_list *mm_list = get_mm_list(memcg);
+
+ VM_BUG_ON_MM(!list_empty(&mm->lru_gen.list), mm);
+#ifdef CONFIG_MEMCG
+ VM_BUG_ON_MM(mm->lru_gen.memcg, mm);
+ mm->lru_gen.memcg = memcg;
+#endif
+ spin_lock(&mm_list->lock);
+
+ list_add_tail(&mm->lru_gen.list, &mm_list->fifo);
+
+ for_each_node(nid) {
+ struct lruvec *lruvec = get_lruvec(memcg, nid);
+
+ if (!lruvec)
+ continue;
+
+ if (lruvec->mm_state.tail == &mm_list->fifo)
+ lruvec->mm_state.tail = lruvec->mm_state.tail->prev;
+ }
+
+ spin_unlock(&mm_list->lock);
+}
+
+void lru_gen_del_mm(struct mm_struct *mm)
+{
+ int nid;
+ struct lru_gen_mm_list *mm_list;
+ struct mem_cgroup *memcg = NULL;
+
+ if (list_empty(&mm->lru_gen.list))
+ return;
+
+#ifdef CONFIG_MEMCG
+ memcg = mm->lru_gen.memcg;
+#endif
+ mm_list = get_mm_list(memcg);
+
+ spin_lock(&mm_list->lock);
+
+ for_each_node(nid) {
+ struct lruvec *lruvec = get_lruvec(memcg, nid);
+
+ if (!lruvec)
+ continue;
+
+ if (lruvec->mm_state.tail == &mm->lru_gen.list)
+ lruvec->mm_state.tail = lruvec->mm_state.tail->next;
+
+ if (lruvec->mm_state.head != &mm->lru_gen.list)
+ continue;
+
+ lruvec->mm_state.head = lruvec->mm_state.head->next;
+ if (lruvec->mm_state.head == &mm_list->fifo)
+ WRITE_ONCE(lruvec->mm_state.seq, lruvec->mm_state.seq + 1);
+ }
+
+ list_del_init(&mm->lru_gen.list);
+
+ spin_unlock(&mm_list->lock);
+
+#ifdef CONFIG_MEMCG
+ mem_cgroup_put(mm->lru_gen.memcg);
+ mm->lru_gen.memcg = NULL;
+#endif
+}
+
+#ifdef CONFIG_MEMCG
+void lru_gen_migrate_mm(struct mm_struct *mm)
+{
+ struct mem_cgroup *memcg;
+
+ lockdep_assert_held(&mm->owner->alloc_lock);
+
+ if (mem_cgroup_disabled())
+ return;
+
+ rcu_read_lock();
+ memcg = mem_cgroup_from_task(mm->owner);
+ rcu_read_unlock();
+ if (memcg == mm->lru_gen.memcg)
+ return;
+
+ VM_BUG_ON_MM(!mm->lru_gen.memcg, mm);
+ VM_BUG_ON_MM(list_empty(&mm->lru_gen.list), mm);
+
+ lru_gen_del_mm(mm);
+ lru_gen_add_mm(mm);
+}
+#endif
+
+/*
+ * Bloom filters with m=1<<15, k=2 and the false positive rates of ~1/5 when
+ * n=10,000 and ~1/2 when n=20,000, where, conventionally, m is the number of
+ * bits in a bitmap, k is the number of hash functions and n is the number of
+ * inserted items.
+ *
+ * Page table walkers use one of the two filters to reduce their search space.
+ * To get rid of non-leaf entries that no longer have enough leaf entries, the
+ * aging uses the double-buffering technique to flip to the other filter each
+ * time it creates a new generation. For non-leaf entries that have enough
+ * leaf entries, the aging carries them over to the next generation in
+ * walk_pmd_range(); the eviction also report them when walking the rmap
+ * in lru_gen_look_around().
+ *
+ * For future optimizations:
+ * 1) It's not necessary to keep both filters all the time. The spare one can be
+ * freed after the RCU grace period and reallocated if needed again.
+ * 2) And when reallocating, it's worth scaling its size according to the number
+ * of inserted entries in the other filter, to reduce the memory overhead on
+ * small systems and false positives on large systems.
+ * 3) Jenkins' hash function is an alternative to Knuth's.
+ */
+#define BLOOM_FILTER_SHIFT 15
+
+static inline int filter_gen_from_seq(unsigned long seq)
+{
+ return seq % NR_BLOOM_FILTERS;
+}
+
+static void get_item_key(void *item, int *key)
+{
+ u32 hash = hash_ptr(item, BLOOM_FILTER_SHIFT * 2);
+
+ BUILD_BUG_ON(BLOOM_FILTER_SHIFT * 2 > BITS_PER_TYPE(u32));
+
+ key[0] = hash & (BIT(BLOOM_FILTER_SHIFT) - 1);
+ key[1] = hash >> BLOOM_FILTER_SHIFT;
+}
+
+static void clear_bloom_filter(struct lruvec *lruvec, unsigned long seq)
+{
+ unsigned long *filter;
+ int gen = filter_gen_from_seq(seq);
+
+ lockdep_assert_held(&get_mm_list(lruvec_memcg(lruvec))->lock);
+
+ filter = lruvec->mm_state.filters[gen];
+ if (filter) {
+ bitmap_clear(filter, 0, BIT(BLOOM_FILTER_SHIFT));
+ return;
+ }
+
+ filter = bitmap_zalloc(BIT(BLOOM_FILTER_SHIFT), GFP_ATOMIC);
+ WRITE_ONCE(lruvec->mm_state.filters[gen], filter);
+}
+
+static void set_bloom_filter(struct lruvec *lruvec, unsigned long seq, void *item)
+{
+ int key[2];
+ unsigned long *filter;
+ int gen = filter_gen_from_seq(seq);
+
+ filter = READ_ONCE(lruvec->mm_state.filters[gen]);
+ if (!filter)
+ return;
+
+ get_item_key(item, key);
+
+ if (!test_bit(key[0], filter))
+ set_bit(key[0], filter);
+ if (!test_bit(key[1], filter))
+ set_bit(key[1], filter);
+}
+
+static bool test_bloom_filter(struct lruvec *lruvec, unsigned long seq, void *item)
+{
+ int key[2];
+ unsigned long *filter;
+ int gen = filter_gen_from_seq(seq);
+
+ filter = READ_ONCE(lruvec->mm_state.filters[gen]);
+ if (!filter)
+ return false;
+
+ get_item_key(item, key);
+
+ return test_bit(key[0], filter) && test_bit(key[1], filter);
+}
+
+static void reset_mm_stats(struct lruvec *lruvec, struct lru_gen_mm_walk *walk, bool last)
+{
+ int i;
+ int hist = lru_hist_from_seq(walk->max_seq);
+
+ lockdep_assert_held(&get_mm_list(lruvec_memcg(lruvec))->lock);
+
+ for (i = 0; i < NR_MM_STATS; i++) {
+ WRITE_ONCE(lruvec->mm_state.stats[hist][i],
+ lruvec->mm_state.stats[hist][i] + walk->mm_stats[i]);
+ walk->mm_stats[i] = 0;
+ }
+
+ if (NR_HIST_GENS == 1 || !last)
+ return;
+
+ hist = lru_hist_from_seq(walk->max_seq + 1);
+ for (i = 0; i < NR_MM_STATS; i++)
+ WRITE_ONCE(lruvec->mm_state.stats[hist][i], 0);
+}
+
+static bool should_skip_mm(struct mm_struct *mm, struct lru_gen_mm_walk *walk)
+{
+ int type;
+ unsigned long size = 0;
+ struct pglist_data *pgdat = lruvec_pgdat(walk->lruvec);
+
+ if (!walk->full_scan && cpumask_empty(mm_cpumask(mm)) &&
+ !node_isset(pgdat->node_id, mm->lru_gen.nodes))
+ return true;
+
+ for (type = !walk->can_swap; type < ANON_AND_FILE; type++) {
+ size += type ? get_mm_counter(mm, MM_FILEPAGES) :
+ get_mm_counter(mm, MM_ANONPAGES) +
+ get_mm_counter(mm, MM_SHMEMPAGES);
+ }
+
+ if (size < MIN_LRU_BATCH)
+ return true;
+
+ if (mm_is_oom_victim(mm))
+ return true;
+
+ if (!mmget_not_zero(mm))
+ return true;
+
+ node_clear(pgdat->node_id, mm->lru_gen.nodes);
+
+ return false;
+}
+
+static bool get_next_mm(struct lruvec *lruvec, struct lru_gen_mm_walk *walk,
+ struct mm_struct **iter)
+{
+ bool first = false;
+ bool last = true;
+ struct mm_struct *mm = NULL;
+ struct mem_cgroup *memcg = lruvec_memcg(lruvec);
+ struct lru_gen_mm_list *mm_list = get_mm_list(memcg);
+ struct lru_gen_mm_state *mm_state = &lruvec->mm_state;
+
+ /*
+ * There are four interesting cases for this page table walker:
+ * 1) It tries to start a new iteration of this list with a stale
+ * max_seq; there is nothing to be done.
+ * 2) It's the first of the current generation, and it needs to prepare
+ * the Bloom filter for the next generation.
+ * 3) It reaches the end of this list, and it needs to increment
+ * mm_state->seq; the iteration is done.
+ * 4) It's the last of the current generation, and it needs to clear the
+ * historical mm stats for the next generation.
+ */
+ if (*iter)
+ mmput_async(*iter);
+ else if (walk->max_seq <= READ_ONCE(mm_state->seq))
+ return false;
+
+ spin_lock(&mm_list->lock);
+
+ VM_BUG_ON(walk->max_seq > mm_state->seq + 1);
+ VM_BUG_ON(*iter && walk->max_seq < mm_state->seq);
+ VM_BUG_ON(*iter && !mm_state->nr_walkers);
+
+ if (walk->max_seq <= mm_state->seq) {
+ if (!*iter)
+ last = false;
+ goto done;
+ }
+
+ if (mm_state->head == &mm_list->fifo) {
+ VM_BUG_ON(mm_state->nr_walkers);
+ mm_state->head = mm_state->head->next;
+ first = true;
+ }
+
+ while (!mm && mm_state->head != &mm_list->fifo) {
+ mm = list_entry(mm_state->head, struct mm_struct, lru_gen.list);
+
+ mm_state->head = mm_state->head->next;
+
+ /* full scan for those added after the last iteration */
+ if (mm_state->tail == &mm->lru_gen.list) {
+ mm_state->tail = mm_state->tail->next;
+ walk->full_scan = true;
+ }
+
+ if (should_skip_mm(mm, walk))
+ mm = NULL;
+ }
+
+ if (mm_state->head == &mm_list->fifo)
+ WRITE_ONCE(mm_state->seq, mm_state->seq + 1);
+done:
+ if (*iter && !mm)
+ mm_state->nr_walkers--;
+ if (!*iter && mm)
+ mm_state->nr_walkers++;
+
+ if (mm_state->nr_walkers)
+ last = false;
+
+ if (mm && first)
+ clear_bloom_filter(lruvec, walk->max_seq + 1);
+
+ if (*iter || last)
+ reset_mm_stats(lruvec, walk, last);
+
+ spin_unlock(&mm_list->lock);
+
+ *iter = mm;
+
+ return last;
+}
+
/******************************************************************************
* state change
******************************************************************************/
@@ -3252,6 +3588,7 @@ void lru_gen_init_state(struct mem_cgroup *memcg, struct lruvec *lruvec)
int i;
int gen, type, zone;
struct lru_gen_struct *lrugen = &lruvec->lrugen;
+ struct lru_gen_mm_list *mm_list = get_mm_list(memcg);
lrugen->max_seq = MIN_NR_GENS + 1;
lrugen->enabled = lru_gen_enabled();
@@ -3261,6 +3598,11 @@ void lru_gen_init_state(struct mem_cgroup *memcg, struct lruvec *lruvec)
for_each_gen_type_zone(gen, type, zone)
INIT_LIST_HEAD(&lrugen->lists[gen][type][zone]);
+
+ lruvec->mm_state.seq = MIN_NR_GENS;
+ lruvec->mm_state.head = &mm_list->fifo;
+ lruvec->mm_state.tail = &mm_list->fifo;
+ init_waitqueue_head(&lruvec->mm_state.wait);
}
#ifdef CONFIG_MEMCG
@@ -3268,6 +3610,9 @@ void lru_gen_init_memcg(struct mem_cgroup *memcg)
{
int nid;
+ INIT_LIST_HEAD(&memcg->mm_list.fifo);
+ spin_lock_init(&memcg->mm_list.lock);
+
for_each_node(nid) {
struct lruvec *lruvec = get_lruvec(memcg, nid);
@@ -3280,10 +3625,16 @@ void lru_gen_free_memcg(struct mem_cgroup *memcg)
int nid;
for_each_node(nid) {
+ int i;
struct lruvec *lruvec = get_lruvec(memcg, nid);
VM_BUG_ON(memchr_inv(lruvec->lrugen.nr_pages, 0,
sizeof(lruvec->lrugen.nr_pages)));
+
+ for (i = 0; i < NR_BLOOM_FILTERS; i++) {
+ bitmap_free(lruvec->mm_state.filters[i]);
+ lruvec->mm_state.filters[i] = NULL;
+ }
}
}
#endif
@@ -3292,6 +3643,7 @@ static int __init init_lru_gen(void)
{
BUILD_BUG_ON(MIN_NR_GENS + 1 >= MAX_NR_GENS);
BUILD_BUG_ON(BIT(LRU_GEN_WIDTH) <= MAX_NR_GENS);
+ BUILD_BUG_ON(sizeof(MM_STAT_CODES) != NR_MM_STATS + 1);
return 0;
};