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Diffstat (limited to 'mm/percpu.c')
-rw-r--r--mm/percpu.c134
1 files changed, 53 insertions, 81 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index 3135e56ce8d4..e7b9ca82e9aa 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -179,10 +179,10 @@ struct list_head *pcpu_chunk_lists __ro_after_init; /* chunk list slots */
static LIST_HEAD(pcpu_map_extend_chunks);
/*
- * The number of empty populated pages by chunk type, protected by pcpu_lock.
+ * The number of empty populated pages, protected by pcpu_lock.
* The reserved chunk doesn't contribute to the count.
*/
-int pcpu_nr_empty_pop_pages[PCPU_NR_CHUNK_TYPES];
+int pcpu_nr_empty_pop_pages;
/*
* The number of populated pages in use by the allocator, protected by
@@ -532,13 +532,10 @@ static void __pcpu_chunk_move(struct pcpu_chunk *chunk, int slot,
bool move_front)
{
if (chunk != pcpu_reserved_chunk) {
- struct list_head *pcpu_slot;
-
- pcpu_slot = pcpu_chunk_list(pcpu_chunk_type(chunk));
if (move_front)
- list_move(&chunk->list, &pcpu_slot[slot]);
+ list_move(&chunk->list, &pcpu_chunk_lists[slot]);
else
- list_move_tail(&chunk->list, &pcpu_slot[slot]);
+ list_move_tail(&chunk->list, &pcpu_chunk_lists[slot]);
}
}
@@ -574,27 +571,22 @@ static void pcpu_chunk_relocate(struct pcpu_chunk *chunk, int oslot)
static void pcpu_isolate_chunk(struct pcpu_chunk *chunk)
{
- enum pcpu_chunk_type type = pcpu_chunk_type(chunk);
- struct list_head *pcpu_slot = pcpu_chunk_list(type);
-
lockdep_assert_held(&pcpu_lock);
if (!chunk->isolated) {
chunk->isolated = true;
- pcpu_nr_empty_pop_pages[type] -= chunk->nr_empty_pop_pages;
+ pcpu_nr_empty_pop_pages -= chunk->nr_empty_pop_pages;
}
- list_move(&chunk->list, &pcpu_slot[pcpu_to_depopulate_slot]);
+ list_move(&chunk->list, &pcpu_chunk_lists[pcpu_to_depopulate_slot]);
}
static void pcpu_reintegrate_chunk(struct pcpu_chunk *chunk)
{
- enum pcpu_chunk_type type = pcpu_chunk_type(chunk);
-
lockdep_assert_held(&pcpu_lock);
if (chunk->isolated) {
chunk->isolated = false;
- pcpu_nr_empty_pop_pages[type] += chunk->nr_empty_pop_pages;
+ pcpu_nr_empty_pop_pages += chunk->nr_empty_pop_pages;
pcpu_chunk_relocate(chunk, -1);
}
}
@@ -612,7 +604,7 @@ static inline void pcpu_update_empty_pages(struct pcpu_chunk *chunk, int nr)
{
chunk->nr_empty_pop_pages += nr;
if (chunk != pcpu_reserved_chunk && !chunk->isolated)
- pcpu_nr_empty_pop_pages[pcpu_chunk_type(chunk)] += nr;
+ pcpu_nr_empty_pop_pages += nr;
}
/*
@@ -1405,7 +1397,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
alloc_size);
#ifdef CONFIG_MEMCG_KMEM
- /* first chunk isn't memcg-aware */
+ /* first chunk is free to use */
chunk->obj_cgroups = NULL;
#endif
pcpu_init_md_blocks(chunk);
@@ -1447,7 +1439,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
return chunk;
}
-static struct pcpu_chunk *pcpu_alloc_chunk(enum pcpu_chunk_type type, gfp_t gfp)
+static struct pcpu_chunk *pcpu_alloc_chunk(gfp_t gfp)
{
struct pcpu_chunk *chunk;
int region_bits;
@@ -1476,7 +1468,7 @@ static struct pcpu_chunk *pcpu_alloc_chunk(enum pcpu_chunk_type type, gfp_t gfp)
goto md_blocks_fail;
#ifdef CONFIG_MEMCG_KMEM
- if (pcpu_is_memcg_chunk(type)) {
+ if (!mem_cgroup_kmem_disabled()) {
chunk->obj_cgroups =
pcpu_mem_zalloc(pcpu_chunk_map_bits(chunk) *
sizeof(struct obj_cgroup *), gfp);
@@ -1589,8 +1581,7 @@ static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
int page_start, int page_end, gfp_t gfp);
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
int page_start, int page_end);
-static struct pcpu_chunk *pcpu_create_chunk(enum pcpu_chunk_type type,
- gfp_t gfp);
+static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp);
static void pcpu_destroy_chunk(struct pcpu_chunk *chunk);
static struct page *pcpu_addr_to_page(void *addr);
static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai);
@@ -1633,25 +1624,25 @@ static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
}
#ifdef CONFIG_MEMCG_KMEM
-static enum pcpu_chunk_type pcpu_memcg_pre_alloc_hook(size_t size, gfp_t gfp,
- struct obj_cgroup **objcgp)
+static bool pcpu_memcg_pre_alloc_hook(size_t size, gfp_t gfp,
+ struct obj_cgroup **objcgp)
{
struct obj_cgroup *objcg;
if (!memcg_kmem_enabled() || !(gfp & __GFP_ACCOUNT))
- return PCPU_CHUNK_ROOT;
+ return true;
objcg = get_obj_cgroup_from_current();
if (!objcg)
- return PCPU_CHUNK_ROOT;
+ return true;
if (obj_cgroup_charge(objcg, gfp, size * num_possible_cpus())) {
obj_cgroup_put(objcg);
- return PCPU_FAIL_ALLOC;
+ return false;
}
*objcgp = objcg;
- return PCPU_CHUNK_MEMCG;
+ return true;
}
static void pcpu_memcg_post_alloc_hook(struct obj_cgroup *objcg,
@@ -1661,7 +1652,7 @@ static void pcpu_memcg_post_alloc_hook(struct obj_cgroup *objcg,
if (!objcg)
return;
- if (chunk) {
+ if (likely(chunk && chunk->obj_cgroups)) {
chunk->obj_cgroups[off >> PCPU_MIN_ALLOC_SHIFT] = objcg;
rcu_read_lock();
@@ -1678,10 +1669,12 @@ static void pcpu_memcg_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
{
struct obj_cgroup *objcg;
- if (!pcpu_is_memcg_chunk(pcpu_chunk_type(chunk)))
+ if (unlikely(!chunk->obj_cgroups))
return;
objcg = chunk->obj_cgroups[off >> PCPU_MIN_ALLOC_SHIFT];
+ if (!objcg)
+ return;
chunk->obj_cgroups[off >> PCPU_MIN_ALLOC_SHIFT] = NULL;
obj_cgroup_uncharge(objcg, size * num_possible_cpus());
@@ -1695,10 +1688,10 @@ static void pcpu_memcg_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
}
#else /* CONFIG_MEMCG_KMEM */
-static enum pcpu_chunk_type
+static bool
pcpu_memcg_pre_alloc_hook(size_t size, gfp_t gfp, struct obj_cgroup **objcgp)
{
- return PCPU_CHUNK_ROOT;
+ return true;
}
static void pcpu_memcg_post_alloc_hook(struct obj_cgroup *objcg,
@@ -1733,8 +1726,6 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
gfp_t pcpu_gfp;
bool is_atomic;
bool do_warn;
- enum pcpu_chunk_type type;
- struct list_head *pcpu_slot;
struct obj_cgroup *objcg = NULL;
static int warn_limit = 10;
struct pcpu_chunk *chunk, *next;
@@ -1770,10 +1761,8 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
return NULL;
}
- type = pcpu_memcg_pre_alloc_hook(size, gfp, &objcg);
- if (unlikely(type == PCPU_FAIL_ALLOC))
+ if (unlikely(!pcpu_memcg_pre_alloc_hook(size, gfp, &objcg)))
return NULL;
- pcpu_slot = pcpu_chunk_list(type);
if (!is_atomic) {
/*
@@ -1812,7 +1801,8 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
restart:
/* search through normal chunks */
for (slot = pcpu_size_to_slot(size); slot <= pcpu_free_slot; slot++) {
- list_for_each_entry_safe(chunk, next, &pcpu_slot[slot], list) {
+ list_for_each_entry_safe(chunk, next, &pcpu_chunk_lists[slot],
+ list) {
off = pcpu_find_block_fit(chunk, bits, bit_align,
is_atomic);
if (off < 0) {
@@ -1841,8 +1831,8 @@ restart:
goto fail;
}
- if (list_empty(&pcpu_slot[pcpu_free_slot])) {
- chunk = pcpu_create_chunk(type, pcpu_gfp);
+ if (list_empty(&pcpu_chunk_lists[pcpu_free_slot])) {
+ chunk = pcpu_create_chunk(pcpu_gfp);
if (!chunk) {
err = "failed to allocate new chunk";
goto fail;
@@ -1886,7 +1876,7 @@ area_found:
mutex_unlock(&pcpu_alloc_mutex);
}
- if (pcpu_nr_empty_pop_pages[type] < PCPU_EMPTY_POP_PAGES_LOW)
+ if (pcpu_nr_empty_pop_pages < PCPU_EMPTY_POP_PAGES_LOW)
pcpu_schedule_balance_work();
/* clear the areas and return address relative to base address */
@@ -1985,18 +1975,16 @@ void __percpu *__alloc_reserved_percpu(size_t size, size_t align)
/**
* pcpu_balance_free - manage the amount of free chunks
- * @type: chunk type
* @empty_only: free chunks only if there are no populated pages
*
* If empty_only is %false, reclaim all fully free chunks regardless of the
* number of populated pages. Otherwise, only reclaim chunks that have no
* populated pages.
*/
-static void pcpu_balance_free(enum pcpu_chunk_type type, bool empty_only)
+static void pcpu_balance_free(bool empty_only)
{
LIST_HEAD(to_free);
- struct list_head *pcpu_slot = pcpu_chunk_list(type);
- struct list_head *free_head = &pcpu_slot[pcpu_free_slot];
+ struct list_head *free_head = &pcpu_chunk_lists[pcpu_free_slot];
struct pcpu_chunk *chunk, *next;
/*
@@ -2035,7 +2023,6 @@ static void pcpu_balance_free(enum pcpu_chunk_type type, bool empty_only)
/**
* pcpu_balance_populated - manage the amount of populated pages
- * @type: chunk type
*
* Maintain a certain amount of populated pages to satisfy atomic allocations.
* It is possible that this is called when physical memory is scarce causing
@@ -2043,11 +2030,10 @@ static void pcpu_balance_free(enum pcpu_chunk_type type, bool empty_only)
* allocation causes the failure as it is possible that requests can be
* serviced from already backed regions.
*/
-static void pcpu_balance_populated(enum pcpu_chunk_type type)
+static void pcpu_balance_populated(void)
{
/* gfp flags passed to underlying allocators */
const gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
- struct list_head *pcpu_slot = pcpu_chunk_list(type);
struct pcpu_chunk *chunk;
int slot, nr_to_pop, ret;
@@ -2068,7 +2054,7 @@ retry_pop:
pcpu_atomic_alloc_failed = false;
} else {
nr_to_pop = clamp(PCPU_EMPTY_POP_PAGES_HIGH -
- pcpu_nr_empty_pop_pages[type],
+ pcpu_nr_empty_pop_pages,
0, PCPU_EMPTY_POP_PAGES_HIGH);
}
@@ -2079,7 +2065,7 @@ retry_pop:
break;
spin_lock_irq(&pcpu_lock);
- list_for_each_entry(chunk, &pcpu_slot[slot], list) {
+ list_for_each_entry(chunk, &pcpu_chunk_lists[slot], list) {
nr_unpop = chunk->nr_pages - chunk->nr_populated;
if (nr_unpop)
break;
@@ -2111,7 +2097,7 @@ retry_pop:
if (nr_to_pop) {
/* ran out of chunks to populate, create a new one and retry */
- chunk = pcpu_create_chunk(type, gfp);
+ chunk = pcpu_create_chunk(gfp);
if (chunk) {
spin_lock_irq(&pcpu_lock);
pcpu_chunk_relocate(chunk, -1);
@@ -2123,7 +2109,6 @@ retry_pop:
/**
* pcpu_reclaim_populated - scan over to_depopulate chunks and free empty pages
- * @type: chunk type
*
* Scan over chunks in the depopulate list and try to release unused populated
* pages back to the system. Depopulated chunks are sidelined to prevent
@@ -2133,9 +2118,8 @@ retry_pop:
* Each chunk is scanned in the reverse order to keep populated pages close to
* the beginning of the chunk.
*/
-static void pcpu_reclaim_populated(enum pcpu_chunk_type type)
+static void pcpu_reclaim_populated(void)
{
- struct list_head *pcpu_slot = pcpu_chunk_list(type);
struct pcpu_chunk *chunk;
struct pcpu_block_md *block;
int i, end;
@@ -2149,8 +2133,8 @@ restart:
* other accessor is the free path which only returns area back to the
* allocator not touching the populated bitmap.
*/
- while (!list_empty(&pcpu_slot[pcpu_to_depopulate_slot])) {
- chunk = list_first_entry(&pcpu_slot[pcpu_to_depopulate_slot],
+ while (!list_empty(&pcpu_chunk_lists[pcpu_to_depopulate_slot])) {
+ chunk = list_first_entry(&pcpu_chunk_lists[pcpu_to_depopulate_slot],
struct pcpu_chunk, list);
WARN_ON(chunk->immutable);
@@ -2164,8 +2148,7 @@ restart:
break;
/* reintegrate chunk to prevent atomic alloc failures */
- if (pcpu_nr_empty_pop_pages[type] <
- PCPU_EMPTY_POP_PAGES_HIGH) {
+ if (pcpu_nr_empty_pop_pages < PCPU_EMPTY_POP_PAGES_HIGH) {
pcpu_reintegrate_chunk(chunk);
goto restart;
}
@@ -2205,7 +2188,7 @@ restart:
pcpu_reintegrate_chunk(chunk);
else
list_move(&chunk->list,
- &pcpu_slot[pcpu_sidelined_slot]);
+ &pcpu_chunk_lists[pcpu_sidelined_slot]);
}
spin_unlock_irq(&pcpu_lock);
@@ -2221,8 +2204,6 @@ restart:
*/
static void pcpu_balance_workfn(struct work_struct *work)
{
- enum pcpu_chunk_type type;
-
/*
* pcpu_balance_free() is called twice because the first time we may
* trim pages in the active pcpu_nr_empty_pop_pages which may cause us
@@ -2230,14 +2211,12 @@ static void pcpu_balance_workfn(struct work_struct *work)
* to move fully free chunks to the active list to be freed if
* appropriate.
*/
- for (type = 0; type < PCPU_NR_CHUNK_TYPES; type++) {
- mutex_lock(&pcpu_alloc_mutex);
- pcpu_balance_free(type, false);
- pcpu_reclaim_populated(type);
- pcpu_balance_populated(type);
- pcpu_balance_free(type, true);
- mutex_unlock(&pcpu_alloc_mutex);
- }
+ mutex_lock(&pcpu_alloc_mutex);
+ pcpu_balance_free(false);
+ pcpu_reclaim_populated();
+ pcpu_balance_populated();
+ pcpu_balance_free(true);
+ mutex_unlock(&pcpu_alloc_mutex);
}
/**
@@ -2256,7 +2235,6 @@ void free_percpu(void __percpu *ptr)
unsigned long flags;
int size, off;
bool need_balance = false;
- struct list_head *pcpu_slot;
if (!ptr)
return;
@@ -2272,8 +2250,6 @@ void free_percpu(void __percpu *ptr)
size = pcpu_free_area(chunk, off);
- pcpu_slot = pcpu_chunk_list(pcpu_chunk_type(chunk));
-
pcpu_memcg_free_hook(chunk, off, size);
/*
@@ -2284,7 +2260,7 @@ void free_percpu(void __percpu *ptr)
if (!chunk->isolated && chunk->free_bytes == pcpu_unit_size) {
struct pcpu_chunk *pos;
- list_for_each_entry(pos, &pcpu_slot[pcpu_free_slot], list)
+ list_for_each_entry(pos, &pcpu_chunk_lists[pcpu_free_slot], list)
if (pos != chunk) {
need_balance = true;
break;
@@ -2592,7 +2568,6 @@ void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
int map_size;
unsigned long tmp_addr;
size_t alloc_size;
- enum pcpu_chunk_type type;
#define PCPU_SETUP_BUG_ON(cond) do { \
if (unlikely(cond)) { \
@@ -2716,17 +2691,14 @@ void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
pcpu_to_depopulate_slot = pcpu_free_slot + 1;
pcpu_nr_slots = pcpu_to_depopulate_slot + 1;
pcpu_chunk_lists = memblock_alloc(pcpu_nr_slots *
- sizeof(pcpu_chunk_lists[0]) *
- PCPU_NR_CHUNK_TYPES,
+ sizeof(pcpu_chunk_lists[0]),
SMP_CACHE_BYTES);
if (!pcpu_chunk_lists)
panic("%s: Failed to allocate %zu bytes\n", __func__,
- pcpu_nr_slots * sizeof(pcpu_chunk_lists[0]) *
- PCPU_NR_CHUNK_TYPES);
+ pcpu_nr_slots * sizeof(pcpu_chunk_lists[0]));
- for (type = 0; type < PCPU_NR_CHUNK_TYPES; type++)
- for (i = 0; i < pcpu_nr_slots; i++)
- INIT_LIST_HEAD(&pcpu_chunk_list(type)[i]);
+ for (i = 0; i < pcpu_nr_slots; i++)
+ INIT_LIST_HEAD(&pcpu_chunk_lists[i]);
/*
* The end of the static region needs to be aligned with the
@@ -2763,7 +2735,7 @@ void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
/* link the first chunk in */
pcpu_first_chunk = chunk;
- pcpu_nr_empty_pop_pages[PCPU_CHUNK_ROOT] = pcpu_first_chunk->nr_empty_pop_pages;
+ pcpu_nr_empty_pop_pages = pcpu_first_chunk->nr_empty_pop_pages;
pcpu_chunk_relocate(pcpu_first_chunk, -1);
/* include all regions of the first chunk */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 18:14:06 +0100