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authorMel Gorman <mgorman@suse.de>2015-06-30 14:57:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-30 19:44:56 -0700
commita4de83dd3377eb43ad95387cc16c27a11aae2feb (patch)
treea5e03e3f69dbe4bb1b1b4a5b7f5d8380bee7de85 /mm
parent3b242c66ccbd60cf47ab0e8992119d9617548c23 (diff)
downloadop-kernel-dev-a4de83dd3377eb43ad95387cc16c27a11aae2feb.zip
op-kernel-dev-a4de83dd3377eb43ad95387cc16c27a11aae2feb.tar.gz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c55
1 files changed, 49 insertions, 6 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0f770cc..e3f00f6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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);
}
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