From 545b1ea9bfa5a8ca9af33d63144bd4f2faaea8dd Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Wed, 22 Mar 2006 00:08:07 -0800 Subject: [PATCH] [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index fc65e87368..7aa0181287 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -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); } } -- 2.39.5