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Message-ID: <20241007164914.198647184@linutronix.de>
Date: Mon, 7 Oct 2024 18:50:15 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Zhen Lei <thunder.leizhen@...wei.com>,
Waiman Long <longman@...hat.com>
Subject: [patch 20/25] debugobjects: Prepare kmem_cache allocations for
batching
Allocate a batch and then push it into the pool. Utilize the
debug_obj::last_node pointer for keeping track of the batch boundary.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
lib/debugobjects.c | 80 ++++++++++++++++++++++++++++++++---------------------
1 file changed, 49 insertions(+), 31 deletions(-)
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -164,6 +164,22 @@ static bool pool_move_batch(struct obj_p
return true;
}
+static bool pool_push_batch(struct obj_pool *dst, struct hlist_head *head)
+{
+ struct hlist_node *last;
+ struct debug_obj *obj;
+
+ if (dst->cnt >= dst->max_cnt)
+ return false;
+
+ obj = hlist_entry(head->first, typeof(*obj), node);
+ last = obj->batch_last;
+
+ hlist_splice_init(head, last, &dst->objects);
+ WRITE_ONCE(dst->cnt, dst->cnt + ODEBUG_BATCH_SIZE);
+ return true;
+}
+
static bool pool_pop_batch(struct hlist_head *head, struct obj_pool *src)
{
if (!src->cnt)
@@ -288,6 +304,28 @@ static void fill_pool_from_freelist(void
clear_bit(0, &state);
}
+static bool kmem_alloc_batch(struct hlist_head *head, struct kmem_cache *cache, gfp_t gfp)
+{
+ struct hlist_node *last = NULL;
+ struct debug_obj *obj;
+
+ for (int cnt = 0; cnt < ODEBUG_BATCH_SIZE; cnt++) {
+ obj = kmem_cache_zalloc(cache, gfp);
+ if (!obj) {
+ free_object_list(head);
+ return false;
+ }
+ debug_objects_allocated++;
+
+ if (!last)
+ last = &obj->node;
+ obj->batch_last = last;
+
+ hlist_add_head(&obj->node, head);
+ }
+ return true;
+}
+
static void fill_pool(void)
{
static atomic_t cpus_allocating;
@@ -302,25 +340,14 @@ static void fill_pool(void)
atomic_inc(&cpus_allocating);
while (pool_should_refill(&pool_global)) {
- struct debug_obj *new, *last = NULL;
HLIST_HEAD(head);
- int cnt;
- for (cnt = 0; cnt < ODEBUG_BATCH_SIZE; cnt++) {
- new = kmem_cache_zalloc(obj_cache, __GFP_HIGH | __GFP_NOWARN);
- if (!new)
- break;
- hlist_add_head(&new->node, &head);
- if (!last)
- last = new;
- }
- if (!cnt)
+ if (!kmem_alloc_batch(&head, obj_cache, __GFP_HIGH | __GFP_NOWARN))
break;
guard(raw_spinlock_irqsave)(&pool_lock);
- hlist_splice_init(&head, &last->node, &pool_global.objects);
- debug_objects_allocated += cnt;
- WRITE_ONCE(pool_global.cnt, pool_global.cnt + cnt);
+ if (!pool_push_batch(&pool_global, &head))
+ pool_push_batch(&pool_to_free, &head);
}
atomic_dec(&cpus_allocating);
}
@@ -1302,26 +1329,18 @@ void __init debug_objects_early_init(voi
static bool __init debug_objects_replace_static_objects(struct kmem_cache *cache)
{
struct debug_bucket *db = obj_hash;
- struct debug_obj *obj, *new;
struct hlist_node *tmp;
+ struct debug_obj *obj;
HLIST_HEAD(objects);
int i;
- for (i = 0; i < ODEBUG_POOL_SIZE; i++) {
- obj = kmem_cache_zalloc(cache, GFP_KERNEL);
- if (!obj)
+ for (i = 0; i < ODEBUG_POOL_SIZE; i += ODEBUG_BATCH_SIZE) {
+ if (!kmem_alloc_batch(&objects, cache, GFP_KERNEL))
goto free;
- hlist_add_head(&obj->node, &objects);
+ pool_push_batch(&pool_global, &objects);
}
- debug_objects_allocated = ODEBUG_POOL_SIZE;
- pool_global.cnt = ODEBUG_POOL_SIZE;
-
- /*
- * Move the allocated objects to the global pool and disconnect the
- * boot pool.
- */
- hlist_move_list(&objects, &pool_global.objects);
+ /* Disconnect the boot pool. */
pool_boot.first = NULL;
/* Replace the active object references */
@@ -1329,9 +1348,8 @@ static bool __init debug_objects_replace
hlist_move_list(&db->list, &objects);
hlist_for_each_entry(obj, &objects, node) {
- new = hlist_entry(pool_global.objects.first, typeof(*obj), node);
- hlist_del(&new->node);
- pool_global.cnt--;
+ struct debug_obj *new = pcpu_alloc();
+
/* copy object data */
*new = *obj;
hlist_add_head(&new->node, &db->list);
@@ -1340,7 +1358,7 @@ static bool __init debug_objects_replace
return true;
free:
/* Can't use free_object_list() as the cache is not populated yet */
- hlist_for_each_entry_safe(obj, tmp, &objects, node) {
+ hlist_for_each_entry_safe(obj, tmp, &pool_global.objects, node) {
hlist_del(&obj->node);
kmem_cache_free(cache, obj);
}
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