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-rw-r--r--include/linux/migrate.h11
-rw-r--r--mm/mempolicy.c23
-rw-r--r--mm/migrate.c115
3 files changed, 59 insertions, 90 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 83af25949fa9..5b95d6568dc4 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -3,14 +3,15 @@
#include <linux/mm.h>
+typedef struct page *new_page_t(struct page *, unsigned long private);
+
#ifdef CONFIG_MIGRATION
extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
extern int putback_lru_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
struct page *, struct page *);
-extern int migrate_pages(struct list_head *l, struct list_head *t);
-extern int migrate_pages_to(struct list_head *pagelist,
- struct vm_area_struct *vma, int dest);
+extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
+
extern int fail_migrate_page(struct address_space *,
struct page *, struct page *);
@@ -21,8 +22,8 @@ extern int migrate_prep(void);
static inline int isolate_lru_page(struct page *p, struct list_head *list)
{ return -ENOSYS; }
static inline int putback_lru_pages(struct list_head *l) { return 0; }
-static inline int migrate_pages(struct list_head *l, struct list_head *t)
- { return -ENOSYS; }
+static inline int migrate_pages(struct list_head *l, new_page_t x,
+ unsigned long private) { return -ENOSYS; }
static inline int migrate_pages_to(struct list_head *pagelist,
struct vm_area_struct *vma, int dest) { return 0; }
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 244f3f130e4a..f432642e9e66 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -87,6 +87,7 @@
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/migrate.h>
+#include <linux/rmap.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
@@ -587,6 +588,11 @@ static void migrate_page_add(struct page *page, struct list_head *pagelist,
isolate_lru_page(page, pagelist);
}
+static struct page *new_node_page(struct page *page, unsigned long node)
+{
+ return alloc_pages_node(node, GFP_HIGHUSER, 0);
+}
+
/*
* Migrate pages from one node to a target node.
* Returns error or the number of pages not migrated.
@@ -604,7 +610,8 @@ int migrate_to_node(struct mm_struct *mm, int source, int dest, int flags)
flags | MPOL_MF_DISCONTIG_OK, &pagelist);
if (!list_empty(&pagelist))
- err = migrate_pages_to(&pagelist, NULL, dest);
+ err = migrate_pages(&pagelist, new_node_page, dest);
+
return err;
}
@@ -691,6 +698,12 @@ int do_migrate_pages(struct mm_struct *mm,
}
+static struct page *new_vma_page(struct page *page, unsigned long private)
+{
+ struct vm_area_struct *vma = (struct vm_area_struct *)private;
+
+ return alloc_page_vma(GFP_HIGHUSER, vma, page_address_in_vma(page, vma));
+}
#else
static void migrate_page_add(struct page *page, struct list_head *pagelist,
@@ -703,6 +716,11 @@ int do_migrate_pages(struct mm_struct *mm,
{
return -ENOSYS;
}
+
+static struct page *new_vma_page(struct page *page, unsigned long private)
+{
+ return NULL;
+}
#endif
long do_mbind(unsigned long start, unsigned long len,
@@ -764,7 +782,8 @@ long do_mbind(unsigned long start, unsigned long len,
err = mbind_range(vma, start, end, new);
if (!list_empty(&pagelist))
- nr_failed = migrate_pages_to(&pagelist, vma, -1);
+ nr_failed = migrate_pages(&pagelist, new_vma_page,
+ (unsigned long)vma);
if (!err && nr_failed && (flags & MPOL_MF_STRICT))
err = -EIO;
diff --git a/mm/migrate.c b/mm/migrate.c
index d3a1810a4c9f..251a8d158257 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -28,9 +28,6 @@
#include "internal.h"
-/* The maximum number of pages to take off the LRU for migration */
-#define MIGRATE_CHUNK_SIZE 256
-
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
/*
@@ -587,18 +584,23 @@ static int move_to_new_page(struct page *newpage, struct page *page)
* Obtain the lock on page, remove all ptes and migrate the page
* to the newly allocated page in newpage.
*/
-static int unmap_and_move(struct page *newpage, struct page *page, int force)
+static int unmap_and_move(new_page_t get_new_page, unsigned long private,
+ struct page *page, int force)
{
int rc = 0;
+ struct page *newpage = get_new_page(page, private);
+
+ if (!newpage)
+ return -ENOMEM;
if (page_count(page) == 1)
/* page was freed from under us. So we are done. */
- goto ret;
+ goto move_newpage;
rc = -EAGAIN;
if (TestSetPageLocked(page)) {
if (!force)
- goto ret;
+ goto move_newpage;
lock_page(page);
}
@@ -622,7 +624,7 @@ static int unmap_and_move(struct page *newpage, struct page *page, int force)
remove_migration_ptes(page, page);
unlock:
unlock_page(page);
-ret:
+
if (rc != -EAGAIN) {
/*
* A page that has been migrated has all references
@@ -632,29 +634,33 @@ ret:
*/
list_del(&page->lru);
move_to_lru(page);
-
- list_del(&newpage->lru);
- move_to_lru(newpage);
}
+
+move_newpage:
+ /*
+ * Move the new page to the LRU. If migration was not successful
+ * then this will free the page.
+ */
+ move_to_lru(newpage);
return rc;
}
/*
* migrate_pages
*
- * Two lists are passed to this function. The first list
- * contains the pages isolated from the LRU to be migrated.
- * The second list contains new pages that the isolated pages
- * can be moved to.
+ * The function takes one list of pages to migrate and a function
+ * that determines from the page to be migrated and the private data
+ * the target of the move and allocates the page.
*
* The function returns after 10 attempts or if no pages
* are movable anymore because to has become empty
* or no retryable pages exist anymore. All pages will be
* retruned to the LRU or freed.
*
- * Return: Number of pages not migrated.
+ * Return: Number of pages not migrated or error code.
*/
-int migrate_pages(struct list_head *from, struct list_head *to)
+int migrate_pages(struct list_head *from,
+ new_page_t get_new_page, unsigned long private)
{
int retry = 1;
int nr_failed = 0;
@@ -671,15 +677,14 @@ int migrate_pages(struct list_head *from, struct list_head *to)
retry = 0;
list_for_each_entry_safe(page, page2, from, lru) {
-
- if (list_empty(to))
- break;
-
cond_resched();
- rc = unmap_and_move(lru_to_page(to), page, pass > 2);
+ rc = unmap_and_move(get_new_page, private,
+ page, pass > 2);
switch(rc) {
+ case -ENOMEM:
+ goto out;
case -EAGAIN:
retry++;
break;
@@ -692,72 +697,16 @@ int migrate_pages(struct list_head *from, struct list_head *to)
}
}
}
-
+ rc = 0;
+out:
if (!swapwrite)
current->flags &= ~PF_SWAPWRITE;
putback_lru_pages(from);
- return nr_failed + retry;
-}
-/*
- * Migrate the list 'pagelist' of pages to a certain destination.
- *
- * Specify destination with either non-NULL vma or dest_node >= 0
- * Return the number of pages not migrated or error code
- */
-int migrate_pages_to(struct list_head *pagelist,
- struct vm_area_struct *vma, int dest)
-{
- LIST_HEAD(newlist);
- int err = 0;
- unsigned long offset = 0;
- int nr_pages;
- int nr_failed = 0;
- struct page *page;
- struct list_head *p;
-
-redo:
- nr_pages = 0;
- list_for_each(p, pagelist) {
- if (vma) {
- /*
- * The address passed to alloc_page_vma is used to
- * generate the proper interleave behavior. We fake
- * the address here by an increasing offset in order
- * to get the proper distribution of pages.
- *
- * No decision has been made as to which page
- * a certain old page is moved to so we cannot
- * specify the correct address.
- */
- page = alloc_page_vma(GFP_HIGHUSER, vma,
- offset + vma->vm_start);
- offset += PAGE_SIZE;
- }
- else
- page = alloc_pages_node(dest, GFP_HIGHUSER, 0);
-
- if (!page) {
- err = -ENOMEM;
- goto out;
- }
- list_add_tail(&page->lru, &newlist);
- nr_pages++;
- if (nr_pages > MIGRATE_CHUNK_SIZE)
- break;
- }
- err = migrate_pages(pagelist, &newlist);
-
- if (err >= 0) {
- nr_failed += err;
- if (list_empty(&newlist) && !list_empty(pagelist))
- goto redo;
- }
-out:
+ if (rc)
+ return rc;
- /* Calculate number of leftover pages */
- list_for_each(p, pagelist)
- nr_failed++;
- return nr_failed;
+ return nr_failed + retry;
}
+
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-28 19:05:19 +0000