[Suspend2][ 08/20] [Suspend2] Generate free page bitmap.

Nigel Cunningham
2006-06-26T22:36:01Z

Generate a bitmap of pages that are free (including in pcp lists).

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

kernel/power/prepare_image.c | 53 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)

diff --git a/kernel/power/prepare_image.c b/kernel/power/prepare_image.c
index e54865a..bf38334 100644
--- a/kernel/power/prepare_image.c
+++ b/kernel/power/prepare_image.c
@@ -169,3 +169,56 @@ static void display_stats(int always, in
suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_MEDIUM, 1, buffer);
}

+/* generate_free_page_map
+ *
+ * Description: This routine generates a bitmap of free pages from the
+ * lists used by the memory manager. We then use the bitmap
+ * to quickly calculate which pages to save and in which
+ * pagesets.
+ */
+static void generate_free_page_map(void)
+{
+ int i, order, loop, cpu;
+ struct page *page;
+ unsigned long flags;
+ struct zone *zone;
+ struct per_cpu_pageset *pset;
+
+ for_each_zone(zone) {
+ if (!zone->present_pages)
+ continue;
+ for(i=0; i < zone->spanned_pages; i++)
+ SetPageInUse(pfn_to_page(zone->zone_start_pfn + i));
+ }
+
+ for_each_zone(zone) {
+ if (!zone->present_pages)
+ continue;
+ spin_lock_irqsave(&zone->lock, flags);
+ for (order = MAX_ORDER - 1; order >= 0; --order) {
+ list_for_each_entry(page, &zone->free_area[order].free_list, lru)
+ for(loop=0; loop < (1 << order); loop++)
+ ClearPageInUse(page+loop);
+ }
+
+
+ for (cpu = 0; cpu < NR_CPUS; cpu++) {
+ if (!cpu_possible(cpu))
+ continue;
+
+ pset = zone_pcp(zone, cpu);
+
+ for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
+ struct per_cpu_pages *pcp;
+ struct page *page;
+
+ pcp = &pset->pcp[i];
+ list_for_each_entry(page, &pcp->list, lru)
+ ClearPageInUse(page);
+ }
+ }
+
+ spin_unlock_irqrestore(&zone->lock, flags);
+ }