On Thu, 3 Dec 2015 21:51:04 +0900 Minchan Kim <minc...@kernel.org> wrote:
> If anon pages are zapped by unmapping between page_mapped check
> and try_to_unmap in shrink_page_list, they could be !PG_dirty
> although thre are not MADV_FREEed pages so that VM accoutns it
> as pglazyfreed wrongly.
>
> To fix, this patch counts the number of lazyfree ptes in
> try_to_unmap_one and try_to_unmap returns SWAP_LZFREE only if
> the count is not zero, page is !PG_dirty and SWAP_SUCCESS.
A few tiny things...
diff -puN mm/rmap.c~mm-support-madvisemadv_free-fix-2-fix mm/rmap.c
--- a/mm/rmap.c~mm-support-madvisemadv_free-fix-2-fix
+++ a/mm/rmap.c
@@ -1605,7 +1605,7 @@ int try_to_unmap(struct page *page, enum
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
- .arg = (void *)&rp,
+ .arg = &rp,
.done = page_not_mapped,
.anon_lock = page_lock_anon_vma_read,
};
@@ -1651,7 +1651,6 @@ int try_to_unmap(struct page *page, enum
int try_to_munlock(struct page *page)
{
int ret;
-
struct rmap_private rp = {
.flags = TTU_MUNLOCK,
.lazyfreed = 0,
@@ -1659,7 +1658,7 @@ int try_to_munlock(struct page *page)
struct rmap_walk_control rwc = {
.rmap_one = try_to_unmap_one,
- .arg = (void *)&rp,
+ .arg = &rp,
.done = page_not_mapped,
.anon_lock = page_lock_anon_vma_read,
diff -puN mm/vmscan.c~mm-support-madvisemadv_free-fix-2-fix mm/vmscan.c
_
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