swsusp: Stop using page flags

Index: linux-2.6.21-rc2/include/linux/suspend.h
===================================================================
@@ -8,6 +8,7 @@
 #include <linux/notifier.h>
 #include <linux/init.h>
 #include <linux/pm.h>
+#include <linux/mm.h>
 
 /* struct pbe is used for creating lists of pages that should be restored
  * atomically during the resume from disk, because the page frames they have

@@ -49,6 +50,38 @@ void __save_processor_state(struct saved
 void __restore_processor_state(struct saved_context *ctxt);
 unsigned long get_safe_page(gfp_t gfp_mask);
 
+/* Page management functions for the software suspend (swsusp) */
+
+static inline void swsusp_set_page_forbidden(struct page *page)
+{
+	SetPageNosave(page);
+}
+
+static inline int swsusp_page_is_forbidden(struct page *page)
+{
+	return PageNosave(page);
+}
+
+static inline void swsusp_unset_page_forbidden(struct page *page)
+{
+	ClearPageNosave(page);
+}
+
+static inline void swsusp_set_page_free(struct page *page)
+{
+	SetPageNosaveFree(page);
+}
+
+static inline int swsusp_page_is_free(struct page *page)
+{
+	return PageNosaveFree(page);
+}
+
+static inline void swsusp_unset_page_free(struct page *page)
+{
+	ClearPageNosaveFree(page);
+}
+
 /*
  * XXX: We try to keep some more pages free so that I/O operations succeed
  * without paging. Might this be more?

136 lines not on this page · raw message

Index: linux-2.6.21-rc2/mm/page_alloc.c
===================================================================
@@ -770,8 +770,8 @@ void mark_free_pages(struct zone *zone)
 		if (pfn_valid(pfn)) {
 			struct page *page = pfn_to_page(pfn);
 
-			if (!PageNosave(page))
-				ClearPageNosaveFree(page);
+			if (!swsusp_page_is_forbidden(page))
+				swsusp_unset_page_free(page);
 		}
 
 	for (order = MAX_ORDER - 1; order >= 0; --order)

@@ -780,7 +780,7 @@ void mark_free_pages(struct zone *zone)
 
 			pfn = page_to_pfn(list_entry(curr, struct page, lru));
 			for (i = 0; i < (1UL << order); i++)
-				SetPageNosaveFree(pfn_to_page(pfn + i));
+				swsusp_set_page_free(pfn_to_page(pfn + i));
 		}
 
 	spin_unlock_irqrestore(&zone->lock, flags);

Index: linux-2.6.21-rc3/include/linux/suspend.h
===================================================================
@@ -24,63 +24,41 @@ struct pbe {
 extern void drain_local_pages(void);
 extern void mark_free_pages(struct zone *zone);
 
-#ifdef CONFIG_PM
-/* kernel/power/swsusp.c */
-extern int software_suspend(void);
-
-#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
+#if defined(CONFIG_PM) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
 extern int pm_prepare_console(void);
 extern void pm_restore_console(void);
 #else
 static inline int pm_prepare_console(void) { return 0; }
 static inline void pm_restore_console(void) {}
-#endif /* defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) */
+#endif
+
+#if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
+/* kernel/power/swsusp.c */
+extern int software_suspend(void);
+/* kernel/power/snapshot.c */
+extern void __init register_nosave_region(unsigned long, unsigned long);
+extern int swsusp_page_is_forbidden(struct page *);
+extern void swsusp_set_page_free(struct page *);
+extern void swsusp_unset_page_free(struct page *);
+extern unsigned long get_safe_page(gfp_t gfp_mask);
 #else
 static inline int software_suspend(void)
 {
 	printk("Warning: fake suspend called\n");
 	return -ENOSYS;
 }
-#endif /* CONFIG_PM */
+
+static inline void register_nosave_region(unsigned long b, unsigned long e) {}
+static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
+static inline void swsusp_set_page_free(struct page *p) {}
+static inline void swsusp_unset_page_free(struct page *p) {}
+#endif /* defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND) */
 
 void save_processor_state(void);
 void restore_processor_state(void);
 struct saved_context;
 void __save_processor_state(struct saved_context *ctxt);
 void __restore_processor_state(struct saved_context *ctxt);
-unsigned long get_safe_page(gfp_t gfp_mask);
-
-/* Page management functions for the software suspend (swsusp) */
-
-static inline void swsusp_set_page_forbidden(struct page *page)
-{
-	SetPageNosave(page);
-}
-
-static inline int swsusp_page_is_forbidden(struct page *page)
-{
-	return PageNosave(page);
-}
-
-static inline void swsusp_unset_page_forbidden(struct page *page)
-{
-	ClearPageNosave(page);
-}
-
-static inline void swsusp_set_page_free(struct page *page)
-{
-	SetPageNosaveFree(page);
-}
-
-static inline int swsusp_page_is_free(struct page *page)
-{
-	return PageNosaveFree(page);
-}
-
-static inline void swsusp_unset_page_free(struct page *page)
-{
-	ClearPageNosaveFree(page);
-}
 
 /*
  * XXX: We try to keep some more pages free so that I/O operations succeed

299 lines not on this page · raw message

Index: linux-2.6.21-rc3/arch/x86_64/kernel/e820.c
===================================================================
@@ -17,6 +17,8 @@
 #include <linux/kexec.h>
 #include <linux/module.h>
 #include <linux/mm.h>
+#include <linux/suspend.h>
+#include <linux/pfn.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>

@@ -255,22 +257,6 @@ void __init e820_reserve_resources(void)
 	}
 }
 
-/* Mark pages corresponding to given address range as nosave */
-static void __init
-e820_mark_nosave_range(unsigned long start, unsigned long end)
-{
-	unsigned long pfn, max_pfn;
-
-	if (start >= end)
-		return;
-
-	printk("Nosave address range: %016lx - %016lx\n", start, end);
-	max_pfn = end >> PAGE_SHIFT;
-	for (pfn = start >> PAGE_SHIFT; pfn < max_pfn; pfn++)
-		if (pfn_valid(pfn))
-			SetPageNosave(pfn_to_page(pfn));
-}
-
 /*
  * Find the ranges of physical addresses that do not correspond to
  * e820 RAM areas and mark the corresponding pages as nosave for software

@@ -289,13 +275,13 @@ void __init e820_mark_nosave_regions(voi
 		struct e820entry *ei = &e820.map[i];
 
 		if (paddr < ei->addr)
-			e820_mark_nosave_range(paddr,
-					round_up(ei->addr, PAGE_SIZE));
+			register_nosave_region(PFN_DOWN(paddr),
+						PFN_UP(ei->addr));
 
 		paddr = round_down(ei->addr + ei->size, PAGE_SIZE);
 		if (ei->type != E820_RAM)
-			e820_mark_nosave_range(round_up(ei->addr, PAGE_SIZE),
-					paddr);
+			register_nosave_region(PFN_UP(ei->addr),
+						PFN_DOWN(paddr));
 
 		if (paddr >= (end_pfn << PAGE_SHIFT))
 			break;

Index: linux-2.6.21-rc3/kernel/power/power.h
===================================================================
@@ -49,6 +49,8 @@ extern sector_t swsusp_resume_block;
 extern asmlinkage int swsusp_arch_suspend(void);
 extern asmlinkage int swsusp_arch_resume(void);
 
+extern int create_basic_memory_bitmaps(void);
+extern void free_basic_memory_bitmaps(void);
 extern unsigned int count_data_pages(void);
 
 /**

Index: linux-2.6.21-rc3/kernel/power/user.c
===================================================================
@@ -52,6 +52,9 @@ static int snapshot_open(struct inode *i
 	if ((filp->f_flags & O_ACCMODE) == O_RDWR)
 		return -ENOSYS;
 
+	if(create_basic_memory_bitmaps())
+		return -ENOMEM;
+
 	nonseekable_open(inode, filp);
 	data = &snapshot_state;
 	filp->private_data = data;

@@ -77,6 +80,7 @@ static int snapshot_release(struct inode
 	struct snapshot_data *data;
 
 	swsusp_free();
+	free_basic_memory_bitmaps();
 	data = filp->private_data;
 	free_all_swap_pages(data->swap, data->bitmap);
 	free_bitmap(data->bitmap);

Index: linux-2.6.21-rc3/kernel/power/disk.c
===================================================================
@@ -127,14 +127,19 @@ int pm_suspend_disk(void)
 		mdelay(5000);
 		goto Thaw;
 	}
+	/* Allocate memory management structures */
+	error = create_basic_memory_bitmaps();
+	if (error)
+		goto Thaw;
+
 	/* Free memory before shutting down devices. */
 	error = swsusp_shrink_memory();
 	if (error)
-		goto Thaw;
+		goto Finish;
 
 	error = platform_prepare();
 	if (error)
-		goto Thaw;
+		goto Finish;
 
 	suspend_console();
 	error = device_suspend(PMSG_FREEZE);

@@ -169,7 +174,7 @@ int pm_suspend_disk(void)
 			power_down(pm_disk_mode);
 		else {
 			swsusp_free();
-			goto Thaw;
+			goto Finish;
 		}
 	} else {
 		pr_debug("PM: Image restored successfully.\n");

@@ -182,6 +187,8 @@ int pm_suspend_disk(void)
 	platform_finish();
 	device_resume();
 	resume_console();
+ Finish:
+	free_basic_memory_bitmaps();
  Thaw:
 	unprepare_processes();
 	return error;

@@ -227,13 +234,15 @@ static int software_resume(void)
 	}
 
 	pr_debug("PM: Checking swsusp image.\n");
-
 	error = swsusp_check();
 	if (error)
-		goto Done;
+		goto Unlock;
 
-	pr_debug("PM: Preparing processes for restore.\n");
+	error = create_basic_memory_bitmaps();
+	if (error)
+		goto Unlock;
 
+	pr_debug("PM: Preparing processes for restore.\n");
 	error = prepare_processes();
 	if (error) {
 		swsusp_close();

@@ -275,7 +284,9 @@ static int software_resume(void)
 	printk(KERN_ERR "PM: Restore failed, recovering.\n");
 	unprepare_processes();
  Done:
+	free_basic_memory_bitmaps();
 	/* For success case, the suspend path will release the lock */
+ Unlock:
 	mutex_unlock(&pm_mutex);
 	pr_debug("PM: Resume from disk failed.\n");
 	return 0;

Index: linux-2.6.21-rc3/include/linux/page-flags.h
===================================================================
@@ -82,13 +82,11 @@
 #define PG_private		11	/* If pagecache, has fs-private data */
 
 #define PG_writeback		12	/* Page is under writeback */
-#define PG_nosave		13	/* Used for system suspend/resume */
 #define PG_compound		14	/* Part of a compound page */
 #define PG_swapcache		15	/* Swap page: swp_entry_t in private */
 
 #define PG_mappedtodisk		16	/* Has blocks allocated on-disk */
 #define PG_reclaim		17	/* To be reclaimed asap */
-#define PG_nosave_free		18	/* Used for system suspend/resume */
 #define PG_buddy		19	/* Page is free, on buddy lists */
 
 /* PG_owner_priv_1 users should have descriptive aliases */

@@ -214,16 +212,6 @@ static inline void SetPageUptodate(struc
 		ret;							\
 	})
 
-#define PageNosave(page)	test_bit(PG_nosave, &(page)->flags)
-#define SetPageNosave(page)	set_bit(PG_nosave, &(page)->flags)
-#define TestSetPageNosave(page)	test_and_set_bit(PG_nosave, &(page)->flags)
-#define ClearPageNosave(page)		clear_bit(PG_nosave, &(page)->flags)
-#define TestClearPageNosave(page)	test_and_clear_bit(PG_nosave, &(page)->flags)
-
-#define PageNosaveFree(page)	test_bit(PG_nosave_free, &(page)->flags)
-#define SetPageNosaveFree(page)	set_bit(PG_nosave_free, &(page)->flags)
-#define ClearPageNosaveFree(page)		clear_bit(PG_nosave_free, &(page)->flags)
-
 #define PageBuddy(page)		test_bit(PG_buddy, &(page)->flags)
 #define __SetPageBuddy(page)	__set_bit(PG_buddy, &(page)->flags)
 #define __ClearPageBuddy(page)	__clear_bit(PG_buddy, &(page)->flags)