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mm: meminit: free pages in large chunks where possible 

Parallel struct page frees pages one at a time. Try free pages as single
large pages where possible.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Tested-by: Nate Zimmer <nzimmer@sgi.com>
Tested-by: Waiman Long <waiman.long@hp.com>
Tested-by: Daniel J Blueman <daniel@numascale.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Robin Holt <robinmholt@gmail.com>
Cc: Nate Zimmer <nzimmer@sgi.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Waiman Long <waiman.long@hp.com>
Cc: Scott Norton <scott.norton@hp.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2015-06-30 14:57:16 -07:00 committed by Linus Torvalds
parent 3b242c66cc
commit a4de83dd33
1 changed files with 49 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
mm/page_alloc.c
View File

@ -1062,6 +1062,25 @@ void __defer_init __free_pages_bootmem(struct page *page, unsigned long pfn,
}
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
static void __defermem_init deferred_free_range(struct page *page,
unsigned long pfn, int nr_pages)
{
int i;
if (!page)
return;
/* Free a large naturally-aligned chunk if possible */
if (nr_pages == MAX_ORDER_NR_PAGES &&
(pfn & (MAX_ORDER_NR_PAGES-1)) == 0) {
__free_pages_boot_core(page, pfn, MAX_ORDER-1);
return;
}
for (i = 0; i < nr_pages; i++, page++, pfn++)
__free_pages_boot_core(page, pfn, 0);
}
/* Initialise remaining memory on a node */
void __defermem_init deferred_init_memmap(int nid)
{
@ -1092,6 +1111,9 @@ void __defermem_init deferred_init_memmap(int nid)
for_each_mem_pfn_range(i, nid, &walk_start, &walk_end, NULL) {
unsigned long pfn, end_pfn;
struct page *page = NULL;
struct page *free_base_page = NULL;
unsigned long free_base_pfn = 0;
int nr_to_free = 0;
end_pfn = min(walk_end, zone_end_pfn(zone));
pfn = first_init_pfn;
@ -1102,7 +1124,7 @@ void __defermem_init deferred_init_memmap(int nid)
for (; pfn < end_pfn; pfn++) {
if (!pfn_valid_within(pfn))
continue;
goto free_range;
/*
* Ensure pfn_valid is checked every
@ -1111,32 +1133,53 @@ void __defermem_init deferred_init_memmap(int nid)
if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0) {
if (!pfn_valid(pfn)) {
page = NULL;
continue;
goto free_range;
}
}
if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) {
page = NULL;
continue;
goto free_range;
}
/* Minimise pfn page lookups and scheduler checks */
if (page && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) {
page++;
} else {
nr_pages += nr_to_free;
deferred_free_range(free_base_page,
free_base_pfn, nr_to_free);
free_base_page = NULL;
free_base_pfn = nr_to_free = 0;
page = pfn_to_page(pfn);
cond_resched();
}
if (page->flags) {
VM_BUG_ON(page_zone(page) != zone);
continue;
goto free_range;
}
__init_single_page(page, pfn, zid, nid);
__free_pages_boot_core(page, pfn, 0);
nr_pages++;
if (!free_base_page) {
free_base_page = page;
free_base_pfn = pfn;
nr_to_free = 0;
}
nr_to_free++;
/* Where possible, batch up pages for a single free */
continue;
free_range:
/* Free the current block of pages to allocator */
nr_pages += nr_to_free;
deferred_free_range(free_base_page, free_base_pfn,
nr_to_free);
free_base_page = NULL;
free_base_pfn = nr_to_free = 0;
}
first_init_pfn = max(end_pfn, first_init_pfn);
}