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mm/rmap: make rmap_walk to get the rmap_walk_control argument

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In each rmap traverse case, there is some difference so that we need
function pointers and arguments to them in order to handle these

For this purpose, struct rmap_walk_control is introduced in this patch,
and will be extended in following patch.  Introducing and extending are
separate, because it clarify changes.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2014-01-21 15:49:48 -08:00 committed by Linus Torvalds
parent faecd8dd85
commit 051ac83adf
5 changed files with 27 additions and 21 deletions
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7
include/linux/ksm.h
View File

@ -76,8 +76,7 @@ struct page *ksm_might_need_to_copy(struct page *page,
int page_referenced_ksm(struct page *page,
struct mem_cgroup *memcg, unsigned long *vm_flags);
int try_to_unmap_ksm(struct page *page, enum ttu_flags flags);
int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
struct vm_area_struct *, unsigned long, void *), void *arg);
int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc);
void ksm_migrate_page(struct page *newpage, struct page *oldpage);
#else /* !CONFIG_KSM */
@ -120,8 +119,8 @@ static inline int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
return 0;
}
static inline int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page*,
struct vm_area_struct *, unsigned long, void *), void *arg)
static inline int rmap_walk_ksm(struct page *page,
struct rmap_walk_control *rwc)
{
return 0;
}

9
include/linux/rmap.h
View File

@ -235,11 +235,16 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page);
void page_unlock_anon_vma_read(struct anon_vma *anon_vma);
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
struct rmap_walk_control {
void *arg;
int (*rmap_one)(struct page *page, struct vm_area_struct *vma,
unsigned long addr, void *arg);
};
/*
* Called by migrate.c to remove migration ptes, but might be used more later.
*/
int rmap_walk(struct page *page, int (*rmap_one)(struct page *,
struct vm_area_struct *, unsigned long, void *), void *arg);
int rmap_walk(struct page *page, struct rmap_walk_control *rwc);
#else /* !CONFIG_MMU */

6
mm/ksm.c
View File

@ -1997,8 +1997,7 @@ out:
}
#ifdef CONFIG_MIGRATION
int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
struct vm_area_struct *, unsigned long, void *), void *arg)
int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
{
struct stable_node *stable_node;
struct rmap_item *rmap_item;
@ -2033,7 +2032,8 @@ again:
if ((rmap_item->mm == vma->vm_mm) == search_new_forks)
continue;
ret = rmap_one(page, vma, rmap_item->address, arg);
ret = rwc->rmap_one(page, vma,
rmap_item->address, rwc->arg);
if (ret != SWAP_AGAIN) {
anon_vma_unlock_read(anon_vma);
goto out;

7
mm/migrate.c
View File

@ -199,7 +199,12 @@ out:
*/
static void remove_migration_ptes(struct page *old, struct page *new)
{
rmap_walk(new, remove_migration_pte, old);
struct rmap_walk_control rwc = {
.rmap_one = remove_migration_pte,
.arg = old,
};
rmap_walk(new, &rwc);
}
/*

19
mm/rmap.c
View File

@ -1706,8 +1706,7 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page)
* rmap_walk() and its helpers rmap_walk_anon() and rmap_walk_file():
* Called by migrate.c to remove migration ptes, but might be used more later.
*/
static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
struct vm_area_struct *, unsigned long, void *), void *arg)
static int rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc)
{
struct anon_vma *anon_vma;
pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
@ -1721,7 +1720,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) {
struct vm_area_struct *vma = avc->vma;
unsigned long address = vma_address(page, vma);
ret = rmap_one(page, vma, address, arg);
ret = rwc->rmap_one(page, vma, address, rwc->arg);
if (ret != SWAP_AGAIN)
break;
}
@ -1729,8 +1728,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
return ret;
}
static int rmap_walk_file(struct page *page, int (*rmap_one)(struct page *,
struct vm_area_struct *, unsigned long, void *), void *arg)
static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
{
struct address_space *mapping = page->mapping;
pgoff_t pgoff = page->index << compound_order(page);
@ -1742,7 +1740,7 @@ static int rmap_walk_file(struct page *page, int (*rmap_one)(struct page *,
mutex_lock(&mapping->i_mmap_mutex);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
unsigned long address = vma_address(page, vma);
ret = rmap_one(page, vma, address, arg);
ret = rwc->rmap_one(page, vma, address, rwc->arg);
if (ret != SWAP_AGAIN)
break;
}
@ -1755,17 +1753,16 @@ static int rmap_walk_file(struct page *page, int (*rmap_one)(struct page *,
return ret;
}
int rmap_walk(struct page *page, int (*rmap_one)(struct page *,
struct vm_area_struct *, unsigned long, void *), void *arg)
int rmap_walk(struct page *page, struct rmap_walk_control *rwc)
{
VM_BUG_ON(!PageLocked(page));
if (unlikely(PageKsm(page)))
return rmap_walk_ksm(page, rmap_one, arg);
return rmap_walk_ksm(page, rwc);
else if (PageAnon(page))
return rmap_walk_anon(page, rmap_one, arg);
return rmap_walk_anon(page, rwc);
else
return rmap_walk_file(page, rmap_one, arg);
return rmap_walk_file(page, rwc);
}
#endif /* CONFIG_MIGRATION */