mm/rmap: extend rmap_walk_xxx() to cope with different cases
There are a lot of common parts in traversing functions, but there are
also a little of uncommon parts in it. By assigning proper function
pointer on each rmap_walker_control, we can handle these difference
correctly.
Following are differences we should handle.
1. difference of lock function in anon mapping case
2. nonlinear handling in file mapping case
3. prechecked condition:
checking memcg in page_referenced(),
checking VM_SHARE in page_mkclean()
checking temporary vma in try_to_unmap()
4. exit condition:
checking page_mapped() in try_to_unmap()
So, in this patch, I introduce 4 function pointers to handle above
differences.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: 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>
diff --git a/mm/rmap.c b/mm/rmap.c
index f8f10ad..97bf8f0 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1684,10 +1684,14 @@
}
#ifdef CONFIG_MIGRATION
-static struct anon_vma *rmap_walk_anon_lock(struct page *page)
+static struct anon_vma *rmap_walk_anon_lock(struct page *page,
+ struct rmap_walk_control *rwc)
{
struct anon_vma *anon_vma;
+ if (rwc->anon_lock)
+ return rwc->anon_lock(page);
+
/*
* Note: remove_migration_ptes() cannot use page_lock_anon_vma_read()
* because that depends on page_mapped(); but not all its usages
@@ -1713,16 +1717,22 @@
struct anon_vma_chain *avc;
int ret = SWAP_AGAIN;
- anon_vma = rmap_walk_anon_lock(page);
+ anon_vma = rmap_walk_anon_lock(page, rwc);
if (!anon_vma)
return ret;
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);
+
+ if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
+ continue;
+
ret = rwc->rmap_one(page, vma, address, rwc->arg);
if (ret != SWAP_AGAIN)
break;
+ if (rwc->done && rwc->done(page))
+ break;
}
anon_vma_unlock_read(anon_vma);
return ret;
@@ -1740,15 +1750,26 @@
mutex_lock(&mapping->i_mmap_mutex);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
unsigned long address = vma_address(page, vma);
+
+ if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
+ continue;
+
ret = rwc->rmap_one(page, vma, address, rwc->arg);
if (ret != SWAP_AGAIN)
- break;
+ goto done;
+ if (rwc->done && rwc->done(page))
+ goto done;
}
- /*
- * No nonlinear handling: being always shared, nonlinear vmas
- * never contain migration ptes. Decide what to do about this
- * limitation to linear when we need rmap_walk() on nonlinear.
- */
+
+ if (!rwc->file_nonlinear)
+ goto done;
+
+ if (list_empty(&mapping->i_mmap_nonlinear))
+ goto done;
+
+ ret = rwc->file_nonlinear(page, mapping, vma);
+
+done:
mutex_unlock(&mapping->i_mmap_mutex);
return ret;
}