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mm: pass nid to reserve_bootmem_region()

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early_pfn_to_nid() is called frequently in init_reserved_page(), it
returns the node id of the PFN.  These PFN are probably from the same
memory region, they have the same node id.  It's not necessary to call
early_pfn_to_nid() for each PFN.

Pass nid to reserve_bootmem_region() and drop the call to
early_pfn_to_nid() in init_reserved_page().  Also, set nid on all reserved
pages before doing this, as some reserved memory regions may not be set
nid.

The most beneficial function is memmap_init_reserved_pages() if
CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled.

The following data was tested on an x86 machine with 190GB of RAM.

before:
memmap_init_reserved_pages()  67ms

after:
memmap_init_reserved_pages()  20ms

Link: https://lkml.kernel.org/r/20230619023406.424298-1-yajun.deng@linux.dev
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yajun Deng 2023-06-19 10:34:06 +08:00 committed by Andrew Morton
parent 9883c7f840
commit 61167ad5fe
3 changed files with 40 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/mm.h
View File

@ -2940,7 +2940,8 @@ extern unsigned long free_reserved_area(void *start, void *end,
extern void adjust_managed_page_count(struct page *page, long count);
extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
extern void reserve_bootmem_region(phys_addr_t start,
phys_addr_t end, int nid);
/* Free the reserved page into the buddy system, so it gets managed. */
static inline void free_reserved_page(struct page *page)

27
mm/memblock.c
View File

@ -2082,19 +2082,30 @@ static void __init memmap_init_reserved_pages(void)
{
struct memblock_region *region;
phys_addr_t start, end;
u64 i;
int nid;
/* initialize struct pages for the reserved regions */
for_each_reserved_mem_range(i, &start, &end)
reserve_bootmem_region(start, end);
/* and also treat struct pages for the NOMAP regions as PageReserved */
/*
* set nid on all reserved pages and also treat struct
* pages for the NOMAP regions as PageReserved
*/
for_each_mem_region(region) {
if (memblock_is_nomap(region)) {
nid = memblock_get_region_node(region);
start = region->base;
end = start + region->size;
reserve_bootmem_region(start, end);
if (memblock_is_nomap(region))
reserve_bootmem_region(start, end, nid);
memblock_set_node(start, end, &memblock.reserved, nid);
}
/* initialize struct pages for the reserved regions */
for_each_reserved_mem_region(region) {
nid = memblock_get_region_node(region);
start = region->base;
end = start + region->size;
reserve_bootmem_region(start, end, nid);
}
}

28
mm/mm_init.c
View File

@ -646,10 +646,8 @@ static inline void pgdat_set_deferred_range(pg_data_t *pgdat)
}
/* Returns true if the struct page for the pfn is initialised */
static inline bool __meminit early_page_initialised(unsigned long pfn)
static inline bool __meminit early_page_initialised(unsigned long pfn, int nid)
{
int nid = early_pfn_to_nid(pfn);
if (node_online(nid) && pfn >= NODE_DATA(nid)->first_deferred_pfn)
return false;
@ -695,15 +693,14 @@ defer_init(int nid, unsigned long pfn, unsigned long end_pfn)
return false;
}
static void __meminit init_reserved_page(unsigned long pfn)
static void __meminit init_reserved_page(unsigned long pfn, int nid)
{
pg_data_t *pgdat;
int nid, zid;
int zid;
if (early_page_initialised(pfn))
if (early_page_initialised(pfn, nid))
return;
nid = early_pfn_to_nid(pfn);
pgdat = NODE_DATA(nid);
for (zid = 0; zid < MAX_NR_ZONES; zid++) {
@ -717,7 +714,7 @@ static void __meminit init_reserved_page(unsigned long pfn)
#else
static inline void pgdat_set_deferred_range(pg_data_t *pgdat) {}
static inline bool early_page_initialised(unsigned long pfn)
static inline bool early_page_initialised(unsigned long pfn, int nid)
{
return true;
}
@ -727,7 +724,7 @@ static inline bool defer_init(int nid, unsigned long pfn, unsigned long end_pfn)
return false;
}
static inline void init_reserved_page(unsigned long pfn)
static inline void init_reserved_page(unsigned long pfn, int nid)
{
}
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
@ -738,7 +735,8 @@ static inline void init_reserved_page(unsigned long pfn)
* marks the pages PageReserved. The remaining valid pages are later
* sent to the buddy page allocator.
*/
void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end)
void __meminit reserve_bootmem_region(phys_addr_t start,
phys_addr_t end, int nid)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long end_pfn = PFN_UP(end);
@ -747,7 +745,7 @@ void __meminit reserve_bootmem_region(phys_addr_t start, phys_addr_t end)
if (pfn_valid(start_pfn)) {
struct page *page = pfn_to_page(start_pfn);
init_reserved_page(start_pfn);
init_reserved_page(start_pfn, nid);
/* Avoid false-positive PageTail() */
INIT_LIST_HEAD(&page->lru);
@ -2572,8 +2570,14 @@ void __init set_dma_reserve(unsigned long new_dma_reserve)
void __init memblock_free_pages(struct page *page, unsigned long pfn,
unsigned int order)
{
if (!early_page_initialised(pfn))
if (IS_ENABLED(CONFIG_DEFERRED_STRUCT_PAGE_INIT)) {
int nid = early_pfn_to_nid(pfn);
if (!early_page_initialised(pfn, nid))
return;
}
if (!kmsan_memblock_free_pages(page, order)) {
/* KMSAN will take care of these pages. */
return;