[PATCH] FRV: Clean up bootmem allocator's page freeing algorithm
David Howells [Fri, 6 Jan 2006 08:11:08 +0000 (00:11 -0800)]
The attached patch cleans up the way the bootmem allocator frees pages.

A new function, __free_pages_bootmem(), is provided in mm/page_alloc.c that is
called from mm/bootmem.c to turn pages over to the main allocator.  All the
bits of code to initialise pages (clearing PG_reserved and setting the page
count) are moved to here.  The checks on page validity are removed, on the
assumption that the struct page arrays will have been prepared correctly.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/bootmem.c
mm/internal.h
mm/page_alloc.c

index cbb82ee..35c3229 100644 (file)
@@ -296,20 +296,12 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
                unsigned long v = ~map[i / BITS_PER_LONG];
 
                if (gofast && v == ~0UL) {
-                       int j, order;
+                       int order;
 
                        page = pfn_to_page(pfn);
                        count += BITS_PER_LONG;
-                       __ClearPageReserved(page);
                        order = ffs(BITS_PER_LONG) - 1;
-                       set_page_refs(page, order);
-                       for (j = 1; j < BITS_PER_LONG; j++) {
-                               if (j + 16 < BITS_PER_LONG)
-                                       prefetchw(page + j + 16);
-                               __ClearPageReserved(page + j);
-                               set_page_count(page + j, 0);
-                       }
-                       __free_pages(page, order);
+                       __free_pages_bootmem(page, order);
                        i += BITS_PER_LONG;
                        page += BITS_PER_LONG;
                } else if (v) {
@@ -319,9 +311,7 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
                        for (m = 1; m && i < idx; m<<=1, page++, i++) {
                                if (v & m) {
                                        count++;
-                                       __ClearPageReserved(page);
-                                       set_page_refs(page, 0);
-                                       __free_page(page);
+                                       __free_pages_bootmem(page, 0);
                                }
                        }
                } else {
@@ -339,9 +329,7 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
        count = 0;
        for (i = 0; i < ((bdata->node_low_pfn-(bdata->node_boot_start >> PAGE_SHIFT))/8 + PAGE_SIZE-1)/PAGE_SIZE; i++,page++) {
                count++;
-               __ClearPageReserved(page);
-               set_page_count(page, 1);
-               __free_page(page);
+               __free_pages_bootmem(page, 0);
        }
        total += count;
        bdata->node_bootmem_map = NULL;
index 85004f5..17256bb 100644 (file)
@@ -26,3 +26,5 @@ static inline void set_page_refs(struct page *page, int order)
 #endif /* CONFIG_MMU */
 }
 
+extern void fastcall __init __free_pages_bootmem(struct page *page,
+                                               unsigned int order);
index 925b0b9..cdad324 100644 (file)
@@ -53,6 +53,8 @@ unsigned long totalram_pages __read_mostly;
 unsigned long totalhigh_pages __read_mostly;
 long nr_swap_pages;
 
+static void fastcall free_hot_cold_page(struct page *page, int cold);
+
 /*
  * results with 256, 32 in the lowmem_reserve sysctl:
  *     1G machine -> (16M dma, 800M-16M normal, 1G-800M high)
@@ -432,6 +434,39 @@ void __free_pages_ok(struct page *page, unsigned int order)
        local_irq_restore(flags);
 }
 
+/*
+ * permit the bootmem allocator to evade page validation on high-order frees
+ */
+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);
+       } else {
+               LIST_HEAD(list);
+               int loop;
+
+               for (loop = 0; loop < BITS_PER_LONG; loop++) {
+                       struct page *p = &page[loop];
+
+                       if (loop + 16 < BITS_PER_LONG)
+                               prefetchw(p + 16);
+                       __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);
+       }
+}
+
 
 /*
  * The order of subdivision here is critical for the IO subsystem.
@@ -671,7 +706,6 @@ static void zone_statistics(struct zonelist *zonelist, struct zone *z)
 /*
  * Free a 0-order page
  */
-static void FASTCALL(free_hot_cold_page(struct page *page, int cold));
 static void fastcall free_hot_cold_page(struct page *page, int cold)
 {
        struct zone *zone = page_zone(page);