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mm, treewide: introduce NR_PAGE_ORDERS 

NR_PAGE_ORDERS defines the number of page orders supported by the page
allocator, ranging from 0 to MAX_ORDER, MAX_ORDER + 1 in total.

NR_PAGE_ORDERS assists in defining arrays of page orders and allows for
more natural iteration over them.

[kirill.shutemov@linux.intel.com: fixup for kerneldoc warning]
  Link: https://lkml.kernel.org/r/20240101111512.7empzyifq7kxtzk3@box
Link: https://lkml.kernel.org/r/20231228144704.14033-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2023-12-28 17:47:03 +03:00 committed by Andrew Morton
parent a5b7620bab
commit fd37721803
15 changed files with 42 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/admin-guide/kdump/vmcoreinfo.rst
View File

@ -172,7 +172,7 @@ variables.
Offset of the free_list's member. This value is used to compute the number
of free pages.
Each zone has a free_area structure array called free_area[MAX_ORDER + 1].
Each zone has a free_area structure array called free_area[NR_PAGE_ORDERS].
The free_list represents a linked list of free page blocks.
(list_head, next|prev)
@ -189,8 +189,8 @@ Offsets of the vmap_area's members. They carry vmalloc-specific
information. Makedumpfile gets the start address of the vmalloc region
from this.
(zone.free_area, MAX_ORDER + 1)
-------------------------------
(zone.free_area, NR_PAGE_ORDERS)
--------------------------------
Free areas descriptor. User-space tools use this value to iterate the
free_area ranges. MAX_ORDER is used by the zone buddy allocator.

2
arch/arm64/kvm/hyp/include/nvhe/gfp.h
View File

@ -16,7 +16,7 @@ struct hyp_pool {
* API at EL2.
*/
hyp_spinlock_t lock;
struct list_head free_area[MAX_ORDER + 1];
struct list_head free_area[NR_PAGE_ORDERS];
phys_addr_t range_start;
phys_addr_t range_end;
unsigned short max_order;

2
arch/sparc/kernel/traps_64.c
View File

@ -897,7 +897,7 @@ void __init cheetah_ecache_flush_init(void)
/* Now allocate error trap reporting scoreboard. */
sz = NR_CPUS * (2 * sizeof(struct cheetah_err_info));
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
if ((PAGE_SIZE << order) >= sz)
break;
}

2
drivers/gpu/drm/ttm/tests/ttm_device_test.c
View File

@ -175,7 +175,7 @@ static void ttm_device_init_pools(struct kunit *test)
if (params->pools_init_expected) {
for (int i = 0; i < TTM_NUM_CACHING_TYPES; ++i) {
for (int j = 0; j <= MAX_ORDER; ++j) {
for (int j = 0; j < NR_PAGE_ORDERS; ++j) {
pt = pool->caching[i].orders[j];
KUNIT_EXPECT_PTR_EQ(test, pt.pool, pool);
KUNIT_EXPECT_EQ(test, pt.caching, i);

20
drivers/gpu/drm/ttm/ttm_pool.c
View File

@ -65,11 +65,11 @@ module_param(page_pool_size, ulong, 0644);
static atomic_long_t allocated_pages;
static struct ttm_pool_type global_write_combined[MAX_ORDER + 1];
static struct ttm_pool_type global_uncached[MAX_ORDER + 1];
static struct ttm_pool_type global_write_combined[NR_PAGE_ORDERS];
static struct ttm_pool_type global_uncached[NR_PAGE_ORDERS];
static struct ttm_pool_type global_dma32_write_combined[MAX_ORDER + 1];
static struct ttm_pool_type global_dma32_uncached[MAX_ORDER + 1];
static struct ttm_pool_type global_dma32_write_combined[NR_PAGE_ORDERS];
static struct ttm_pool_type global_dma32_uncached[NR_PAGE_ORDERS];
static spinlock_t shrinker_lock;
static struct list_head shrinker_list;
@ -568,7 +568,7 @@ void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
if (use_dma_alloc || nid != NUMA_NO_NODE) {
for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
for (j = 0; j <= MAX_ORDER; ++j)
for (j = 0; j < NR_PAGE_ORDERS; ++j)
ttm_pool_type_init(&pool->caching[i].orders[j],
pool, i, j);
}
@ -601,7 +601,7 @@ void ttm_pool_fini(struct ttm_pool *pool)
if (pool->use_dma_alloc || pool->nid != NUMA_NO_NODE) {
for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
for (j = 0; j <= MAX_ORDER; ++j)
for (j = 0; j < NR_PAGE_ORDERS; ++j)
ttm_pool_type_fini(&pool->caching[i].orders[j]);
}
@ -656,7 +656,7 @@ static void ttm_pool_debugfs_header(struct seq_file *m)
unsigned int i;
seq_puts(m, "\t ");
for (i = 0; i <= MAX_ORDER; ++i)
for (i = 0; i < NR_PAGE_ORDERS; ++i)
seq_printf(m, " ---%2u---", i);
seq_puts(m, "\n");
}
@ -667,7 +667,7 @@ static void ttm_pool_debugfs_orders(struct ttm_pool_type *pt,
{
unsigned int i;
for (i = 0; i <= MAX_ORDER; ++i)
for (i = 0; i < NR_PAGE_ORDERS; ++i)
seq_printf(m, " %8u", ttm_pool_type_count(&pt[i]));
seq_puts(m, "\n");
}
@ -776,7 +776,7 @@ int ttm_pool_mgr_init(unsigned long num_pages)
spin_lock_init(&shrinker_lock);
INIT_LIST_HEAD(&shrinker_list);
for (i = 0; i <= MAX_ORDER; ++i) {
for (i = 0; i < NR_PAGE_ORDERS; ++i) {
ttm_pool_type_init(&global_write_combined[i], NULL,
ttm_write_combined, i);
ttm_pool_type_init(&global_uncached[i], NULL, ttm_uncached, i);
@ -816,7 +816,7 @@ void ttm_pool_mgr_fini(void)
{
unsigned int i;
for (i = 0; i <= MAX_ORDER; ++i) {
for (i = 0; i < NR_PAGE_ORDERS; ++i) {
ttm_pool_type_fini(&global_write_combined[i]);
ttm_pool_type_fini(&global_uncached[i]);

2
include/drm/ttm/ttm_pool.h
View File

@ -74,7 +74,7 @@ struct ttm_pool {
bool use_dma32;
struct {
struct ttm_pool_type orders[MAX_ORDER + 1];
struct ttm_pool_type orders[NR_PAGE_ORDERS];
} caching[TTM_NUM_CACHING_TYPES];
};

6
include/linux/mmzone.h
View File

@ -35,6 +35,8 @@
#define IS_MAX_ORDER_ALIGNED(pfn) IS_ALIGNED(pfn, MAX_ORDER_NR_PAGES)
#define NR_PAGE_ORDERS (MAX_ORDER + 1)
/*
* PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed
* costly to service. That is between allocation orders which should
@ -96,7 +98,7 @@ static inline bool migratetype_is_mergeable(int mt)
}
#define for_each_migratetype_order(order, type) \
for (order = 0; order <= MAX_ORDER; order++) \
for (order = 0; order < NR_PAGE_ORDERS; order++) \
for (type = 0; type < MIGRATE_TYPES; type++)
extern int page_group_by_mobility_disabled;
@ -933,7 +935,7 @@ struct zone {
CACHELINE_PADDING(_pad1_);
/* free areas of different sizes */
struct free_area free_area[MAX_ORDER + 1];
struct free_area free_area[NR_PAGE_ORDERS];
#ifdef CONFIG_UNACCEPTED_MEMORY
/* Pages to be accepted. All pages on the list are MAX_ORDER */

2
kernel/crash_core.c
View File

@ -802,7 +802,7 @@ static int __init crash_save_vmcoreinfo_init(void)
VMCOREINFO_OFFSET(list_head, prev);
VMCOREINFO_OFFSET(vmap_area, va_start);
VMCOREINFO_OFFSET(vmap_area, list);
VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER + 1);
VMCOREINFO_LENGTH(zone.free_area, NR_PAGE_ORDERS);
log_buf_vmcoreinfo_setup();
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
VMCOREINFO_NUMBER(NR_FREE_PAGES);

2
lib/test_meminit.c
View File

@ -93,7 +93,7 @@ static int __init test_pages(int *total_failures)
int failures = 0, num_tests = 0;
int i;
for (i = 0; i <= MAX_ORDER; i++)
for (i = 0; i < NR_PAGE_ORDERS; i++)
num_tests += do_alloc_pages_order(i, &failures);
REPORT_FAILURES_IN_FN();

2
mm/compaction.c
View File

@ -2229,7 +2229,7 @@ static enum compact_result __compact_finished(struct compact_control *cc)
/* Direct compactor: Is a suitable page free? */
ret = COMPACT_NO_SUITABLE_PAGE;
for (order = cc->order; order <= MAX_ORDER; order++) {
for (order = cc->order; order < NR_PAGE_ORDERS; order++) {
struct free_area *area = &cc->zone->free_area[order];
bool can_steal;

2
mm/kmsan/init.c
View File

@ -96,7 +96,7 @@ void __init kmsan_init_shadow(void)
struct metadata_page_pair {
struct page *shadow, *origin;
};
static struct metadata_page_pair held_back[MAX_ORDER + 1] __initdata;
static struct metadata_page_pair held_back[NR_PAGE_ORDERS] __initdata;
/*
* Eager metadata allocation. When the memblock allocator is freeing pages to

13
mm/page_alloc.c
View File

@ -1560,7 +1560,7 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
struct page *page;
/* Find a page of the appropriate size in the preferred list */
for (current_order = order; current_order <= MAX_ORDER; ++current_order) {
for (current_order = order; current_order < NR_PAGE_ORDERS; ++current_order) {
area = &(zone->free_area[current_order]);
page = get_page_from_free_area(area, migratetype);
if (!page)
@ -1934,7 +1934,7 @@ static bool unreserve_highatomic_pageblock(const struct alloc_context *ac,
continue;
spin_lock_irqsave(&zone->lock, flags);
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
struct free_area *area = &(zone->free_area[order]);
page = get_page_from_free_area(area, MIGRATE_HIGHATOMIC);
@ -2044,8 +2044,7 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype,
return false;
find_smallest:
for (current_order = order; current_order <= MAX_ORDER;
current_order++) {
for (current_order = order; current_order < NR_PAGE_ORDERS; current_order++) {
area = &(zone->free_area[current_order]);
fallback_mt = find_suitable_fallback(area, current_order,
start_migratetype, false, &can_steal);
@ -3000,7 +2999,7 @@ bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark,
return true;
/* For a high-order request, check at least one suitable page is free */
for (o = order; o <= MAX_ORDER; o++) {
for (o = order; o < NR_PAGE_ORDERS; o++) {
struct free_area *area = &z->free_area[o];
int mt;
@ -6628,7 +6627,7 @@ bool is_free_buddy_page(struct page *page)
unsigned long pfn = page_to_pfn(page);
unsigned int order;
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
struct page *page_head = page - (pfn & ((1 << order) - 1));
if (PageBuddy(page_head) &&
@ -6683,7 +6682,7 @@ bool take_page_off_buddy(struct page *page)
bool ret = false;
spin_lock_irqsave(&zone->lock, flags);
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
struct page *page_head = page - (pfn & ((1 << order) - 1));
int page_order = buddy_order(page_head);

2
mm/page_reporting.c
View File

@ -276,7 +276,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev,
return err;
/* Process each free list starting from lowest order/mt */
for (order = page_reporting_order; order <= MAX_ORDER; order++) {
for (order = page_reporting_order; order < NR_PAGE_ORDERS; order++) {
for (mt = 0; mt < MIGRATE_TYPES; mt++) {
/* We do not pull pages from the isolate free list */
if (is_migrate_isolate(mt))

8
mm/show_mem.c
View File

@ -352,8 +352,8 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
for_each_populated_zone(zone) {
unsigned int order;
unsigned long nr[MAX_ORDER + 1], flags, total = 0;
unsigned char types[MAX_ORDER + 1];
unsigned long nr[NR_PAGE_ORDERS], flags, total = 0;
unsigned char types[NR_PAGE_ORDERS];
if (zone_idx(zone) > max_zone_idx)
continue;
@ -363,7 +363,7 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
printk(KERN_CONT "%s: ", zone->name);
spin_lock_irqsave(&zone->lock, flags);
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
struct free_area *area = &zone->free_area[order];
int type;
@ -377,7 +377,7 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z
}
}
spin_unlock_irqrestore(&zone->lock, flags);
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
printk(KERN_CONT "%lu*%lukB ",
nr[order], K(1UL) << order);
if (nr[order])

12
mm/vmstat.c
View File

@ -1059,7 +1059,7 @@ static void fill_contig_page_info(struct zone *zone,
info->free_blocks_total = 0;
info->free_blocks_suitable = 0;
for (order = 0; order <= MAX_ORDER; order++) {
for (order = 0; order < NR_PAGE_ORDERS; order++) {
unsigned long blocks;
/*
@ -1476,7 +1476,7 @@ static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
int order;
seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
for (order = 0; order <= MAX_ORDER; ++order)
for (order = 0; order < NR_PAGE_ORDERS; ++order)
/*
* Access to nr_free is lockless as nr_free is used only for
* printing purposes. Use data_race to avoid KCSAN warning.
@ -1505,7 +1505,7 @@ static void pagetypeinfo_showfree_print(struct seq_file *m,
pgdat->node_id,
zone->name,
migratetype_names[mtype]);
for (order = 0; order <= MAX_ORDER; ++order) {
for (order = 0; order < NR_PAGE_ORDERS; ++order) {
unsigned long freecount = 0;
struct free_area *area;
struct list_head *curr;
@ -1545,7 +1545,7 @@ static void pagetypeinfo_showfree(struct seq_file *m, void *arg)
/* Print header */
seq_printf(m, "%-43s ", "Free pages count per migrate type at order");
for (order = 0; order <= MAX_ORDER; ++order)
for (order = 0; order < NR_PAGE_ORDERS; ++order)
seq_printf(m, "%6d ", order);
seq_putc(m, '\n');
@ -2181,7 +2181,7 @@ static void unusable_show_print(struct seq_file *m,
seq_printf(m, "Node %d, zone %8s ",
pgdat->node_id,
zone->name);
for (order = 0; order <= MAX_ORDER; ++order) {
for (order = 0; order < NR_PAGE_ORDERS; ++order) {
fill_contig_page_info(zone, order, &info);
index = unusable_free_index(order, &info);
seq_printf(m, "%d.%03d ", index / 1000, index % 1000);
@ -2233,7 +2233,7 @@ static void extfrag_show_print(struct seq_file *m,
seq_printf(m, "Node %d, zone %8s ",
pgdat->node_id,
zone->name);
for (order = 0; order <= MAX_ORDER; ++order) {
for (order = 0; order < NR_PAGE_ORDERS; ++order) {
fill_contig_page_info(zone, order, &info);
index = __fragmentation_index(order, &info);
seq_printf(m, "%2d.%03d ", index / 1000, index % 1000);