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[PATCH] mm: cleanup bootmem 

The bootmem code added to page_alloc.c duplicated some page freeing code
that it really doesn't need to because it is not so performance critical.

While we're here, make prefetching work properly by actually prefetching
the page we're about to use before prefetching ahead to the next one (ie.
get the most important transaction started first).  Also prefetch just a
single page ahead rather than leaving a gap of 16.

Jack Steiner reported no problems with SGI's ia64 simulator.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-03-22 00:08:07 -08:00 committed by Linus Torvalds
parent 9d41415221
commit 545b1ea9bf
1 changed files with 7 additions and 13 deletions
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20
mm/page_alloc.c
View File

@ -55,7 +55,6 @@ unsigned long totalhigh_pages __read_mostly;
long nr_swap_pages;
int percpu_pagelist_fraction;
static void fastcall free_hot_cold_page(struct page *page, int cold);
static void __free_pages_ok(struct page *page, unsigned int order);
/*
@ -448,28 +447,23 @@ void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order)
if (order == 0) {
__ClearPageReserved(page);
set_page_count(page, 0);
free_hot_cold_page(page, 0);
set_page_refs(page, 0);
__free_page(page);
} else {
LIST_HEAD(list);
int loop;
prefetchw(page);
for (loop = 0; loop < BITS_PER_LONG; loop++) {
struct page *p = &page[loop];
if (loop + 16 < BITS_PER_LONG)
prefetchw(p + 16);
if (loop + 1 < BITS_PER_LONG)
prefetchw(p + 1);
__ClearPageReserved(p);
set_page_count(p, 0);
}
arch_free_page(page, order);
mod_page_state(pgfree, 1 << order);
list_add(&page->lru, &list);
kernel_map_pages(page, 1 << order, 0);
free_pages_bulk(page_zone(page), 1, &list, order);
set_page_refs(page, order);
__free_pages(page, order);
}
}