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Subject[PATCH V2 2/2] fs/aio: Add support to aio ring pages migration
As the aio job will pin the ring pages, that will lead to mem migrated
failed. In order to fix this problem we use an anon inode to manage the aio ring
pages, and setup the migratepage callback in the anon inode's address space, so
that when mem migrating the aio ring pages will be moved to other mem node safely.

v1->v2:
Fix build failed issue if CONFIG_MIGRATION disabled.
Fix some minor issues under Benjamin's comments.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
---
fs/aio.c | 116 +++++++++++++++++++++++++++++++++++++++++++----
include/linux/migrate.h | 9 ++++
mm/migrate.c | 2 +-
3 files changed, 116 insertions(+), 11 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 2bbcacf..15e8a13 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -35,6 +35,9 @@
#include <linux/eventfd.h>
#include <linux/blkdev.h>
#include <linux/compat.h>
+#include <linux/anon_inodes.h>
+#include <linux/migrate.h>
+#include <linux/ramfs.h>

#include <asm/kmap_types.h>
#include <asm/uaccess.h>
@@ -108,6 +111,7 @@ struct kioctx {
} ____cacheline_aligned_in_smp;

struct page *internal_pages[AIO_RING_PAGES];
+ struct file *aio_ring_file;
};

/*------ sysctl variables----*/
@@ -136,15 +140,78 @@ __initcall(aio_setup);

static void aio_free_ring(struct kioctx *ctx)
{
- long i;
-
- for (i = 0; i < ctx->nr_pages; i++)
+ int i;
+ struct file *aio_ring_file = ctx->aio_ring_file;
+ for (i = 0; i < ctx->nr_pages; i++) {
+ pr_debug("pid(%d) [%d] page->count=%d\n", current->pid, i,
+ page_count(ctx->ring_pages[i]));
put_page(ctx->ring_pages[i]);
+ }

if (ctx->ring_pages && ctx->ring_pages != ctx->internal_pages)
kfree(ctx->ring_pages);
+
+ if (aio_ring_file) {
+ truncate_setsize(aio_ring_file->f_inode, 0);
+ pr_debug("pid(%d) i_nlink=%u d_count=%d d_unhashed=%d i_count=%d\n",
+ current->pid, aio_ring_file->f_inode->i_nlink,
+ aio_ring_file->f_path.dentry->d_count,
+ d_unhashed(aio_ring_file->f_path.dentry),
+ atomic_read(&aio_ring_file->f_inode->i_count));
+ fput(aio_ring_file);
+ ctx->aio_ring_file = NULL;
+ }
+}
+
+static int aio_ring_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ vma->vm_ops = &generic_file_vm_ops;
+ return 0;
+}
+
+static const struct file_operations aio_ring_fops = {
+ .mmap = aio_ring_mmap,
+};
+
+static int aio_set_page_dirty(struct page *page)
+{
+ return 0;
}

+static int aio_migratepage(struct address_space *mapping, struct page *new,
+ struct page *old, enum migrate_mode mode)
+{
+ struct kioctx *ctx = mapping->private_data;
+ unsigned long flags;
+ unsigned idx = old->index;
+ int rc;
+
+ /* Writeback must be complete */
+ BUG_ON(PageWriteback(old));
+
+ put_page(old);
+
+ rc = migrate_page_move_mapping(mapping, new, old, NULL, mode);
+ if (rc != MIGRATEPAGE_SUCCESS) {
+ get_page(old);
+ return rc;
+ }
+
+ get_page(new);
+
+ spin_lock_irqsave(&ctx->completion_lock, flags);
+ migrate_page_copy(new, old);
+ ctx->ring_pages[idx] = new;
+ spin_unlock_irqrestore(&ctx->completion_lock, flags);
+
+ return rc;
+}
+
+static const struct address_space_operations aio_ctx_aops = {
+ .set_page_dirty = aio_set_page_dirty,
+ .migratepage = aio_migratepage,
+};
+
static int aio_setup_ring(struct kioctx *ctx)
{
struct aio_ring *ring;
@@ -152,18 +219,42 @@ static int aio_setup_ring(struct kioctx *ctx)
struct mm_struct *mm = current->mm;
unsigned long size, populate;
int nr_pages;
+ int i;
+ struct file *file;

/* Compensate for the ring buffer's head/tail overlap entry */
nr_events += 2; /* 1 is required, 2 for good luck */

size = sizeof(struct aio_ring);
size += sizeof(struct io_event) * nr_events;
- nr_pages = (size + PAGE_SIZE-1) >> PAGE_SHIFT;
+ nr_pages = PFN_UP(size);

if (nr_pages < 0)
return -EINVAL;
+ file = anon_inode_getfile_private("[aio]", &aio_ring_fops, ctx, O_RDWR);
+ if (IS_ERR(file)) {
+ ctx->aio_ring_file = NULL;
+ return -EAGAIN;
+ }
+ file->f_inode->i_mapping->a_ops = &aio_ctx_aops;
+ file->f_inode->i_mapping->private_data = ctx;
+ file->f_inode->i_size = PAGE_SIZE * (loff_t)nr_pages;

- nr_events = (PAGE_SIZE * nr_pages - sizeof(struct aio_ring)) / sizeof(struct io_event);
+ for (i = 0; i < nr_pages; i++) {
+ struct page *page;
+ page = find_or_create_page(file->f_inode->i_mapping,
+ i, GFP_HIGHUSER | __GFP_ZERO);
+ if (!page)
+ break;
+ pr_debug("pid(%d) page[%d]->count=%d\n",
+ current->pid, i, page_count(page));
+ SetPageUptodate(page);
+ SetPageDirty(page);
+ unlock_page(page);
+ }
+ ctx->aio_ring_file = file;
+ nr_events = (PAGE_SIZE * nr_pages - sizeof(struct aio_ring))
+ / sizeof(struct io_event);

ctx->nr_events = 0;
ctx->ring_pages = ctx->internal_pages;
@@ -177,20 +268,23 @@ static int aio_setup_ring(struct kioctx *ctx)
ctx->mmap_size = nr_pages * PAGE_SIZE;
pr_debug("attempting mmap of %lu bytes\n", ctx->mmap_size);
down_write(&mm->mmap_sem);
- ctx->mmap_base = do_mmap_pgoff(NULL, 0, ctx->mmap_size,
- PROT_READ|PROT_WRITE,
- MAP_ANONYMOUS|MAP_PRIVATE, 0, &populate);
+ ctx->mmap_base = do_mmap_pgoff(ctx->aio_ring_file, 0, ctx->mmap_size,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_POPULATE, 0, &populate);
if (IS_ERR((void *)ctx->mmap_base)) {
up_write(&mm->mmap_sem);
ctx->mmap_size = 0;
aio_free_ring(ctx);
return -EAGAIN;
}
+ up_write(&mm->mmap_sem);
+ mm_populate(ctx->mmap_base, populate);

pr_debug("mmap address: 0x%08lx\n", ctx->mmap_base);
ctx->nr_pages = get_user_pages(current, mm, ctx->mmap_base, nr_pages,
1, 0, ctx->ring_pages, NULL);
- up_write(&mm->mmap_sem);
+ for (i = 0; i < ctx->nr_pages; i++)
+ put_page(ctx->ring_pages[i]);

if (unlikely(ctx->nr_pages != nr_pages)) {
aio_free_ring(ctx);
@@ -397,6 +491,8 @@ out_cleanup:
err = -EAGAIN;
aio_free_ring(ctx);
out_freectx:
+ if (ctx->aio_ring_file)
+ fput(ctx->aio_ring_file);
kmem_cache_free(kioctx_cachep, ctx);
pr_debug("error allocating ioctx %d\n", err);
return ERR_PTR(err);
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index a405d3d..db67768 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -55,6 +55,9 @@ extern int migrate_vmas(struct mm_struct *mm,
extern void migrate_page_copy(struct page *newpage, struct page *page);
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page);
+extern int migrate_page_move_mapping(struct address_space *mapping,
+ struct page *newpage, struct page *page,
+ struct buffer_head *head, enum migrate_mode mode);
#else

static inline void putback_lru_pages(struct list_head *l) {}
@@ -84,6 +87,12 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
{
return -ENOSYS;
}
+static inline int migrate_page_move_mapping(struct address_space *mapping,
+ struct page *newpage, struct page *page,
+ struct buffer_head *head, enum migrate_mode mode)
+{
+ return -ENOSYS;
+}

/* Possible settings for the migrate_page() method in address_operations */
#define migrate_page NULL
diff --git a/mm/migrate.c b/mm/migrate.c
index 6f0c244..1da0092 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -307,7 +307,7 @@ static inline bool buffer_migrate_lock_buffers(struct buffer_head *head,
* 2 for pages with a mapping
* 3 for pages with a mapping and PagePrivate/PagePrivate2 set.
*/
-static int migrate_page_move_mapping(struct address_space *mapping,
+int migrate_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page,
struct buffer_head *head, enum migrate_mode mode)
{
--
1.7.1


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