[PATCH 2/2] mlock: do not munlock pages in __do_fault()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



If the page is going to be written to, __do_page needs to break COW.
However, the old page (before breaking COW) was never mapped mapped into
the current pte (__do_fault is only called when the pte is not present),
so vmscan can't have marked the old page as PageMlocked due to being
mapped in __do_fault's VMA. Therefore, __do_fault() does not need to worry
about clearing PageMlocked() on the old page.

Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>
---
 mm/memory.c |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 68f2dbe..7befd03 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3015,12 +3015,6 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 				goto out;
 			}
 			charged = 1;
-			/*
-			 * Don't let another task, with possibly unlocked vma,
-			 * keep the mlocked page.
-			 */
-			if (vma->vm_flags & VM_LOCKED)
-				clear_page_mlock(vmf.page);
 			copy_user_highpage(page, vmf.page, address, vma);
 			__SetPageUptodate(page);
 		} else {
-- 
1.7.3.1

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxxx  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>


[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]