The patch titled ksm: fix mlockfreed to munlocked has been removed from the -mm tree. Its filename was ksm-fix-mlockfreed-to-munlocked.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: ksm: fix mlockfreed to munlocked From: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx> When KSM merges an mlocked page, it has been forgetting to munlock it: that's been left to free_page_mlock(), which reports it in /proc/vmstat as unevictable_pgs_mlockfreed instead of unevictable_pgs_munlocked (and whinges "Page flag mlocked set for process" in mmotm, whereas mainline is silently forgiving). Call munlock_vma_page() to fix that. Signed-off-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx> Cc: Izik Eidus <ieidus@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Chris Wright <chrisw@xxxxxxxxxx> Acked-by: Rik van Riel <riel@xxxxxxxxxx> Acked-by: Mel Gorman <mel@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/internal.h | 3 ++- mm/ksm.c | 4 ++++ mm/mlock.c | 4 ++-- 3 files changed, 8 insertions(+), 3 deletions(-) diff -puN mm/internal.h~ksm-fix-mlockfreed-to-munlocked mm/internal.h --- a/mm/internal.h~ksm-fix-mlockfreed-to-munlocked +++ a/mm/internal.h @@ -105,9 +105,10 @@ static inline int is_mlocked_vma(struct } /* - * must be called with vma's mmap_sem held for read, and page locked. + * must be called with vma's mmap_sem held for read or write, and page locked. */ extern void mlock_vma_page(struct page *page); +extern void munlock_vma_page(struct page *page); /* * Clear the page's PageMlocked(). This can be useful in a situation where diff -puN mm/ksm.c~ksm-fix-mlockfreed-to-munlocked mm/ksm.c --- a/mm/ksm.c~ksm-fix-mlockfreed-to-munlocked +++ a/mm/ksm.c @@ -34,6 +34,7 @@ #include <linux/ksm.h> #include <asm/tlbflush.h> +#include "internal.h" /* * A few notes about the KSM scanning process, @@ -762,6 +763,9 @@ static int try_to_merge_one_page(struct pages_identical(page, kpage)) err = replace_page(vma, page, kpage, orig_pte); + if ((vma->vm_flags & VM_LOCKED) && !err) + munlock_vma_page(page); + unlock_page(page); out: return err; diff -puN mm/mlock.c~ksm-fix-mlockfreed-to-munlocked mm/mlock.c --- a/mm/mlock.c~ksm-fix-mlockfreed-to-munlocked +++ a/mm/mlock.c @@ -99,14 +99,14 @@ void mlock_vma_page(struct page *page) * not get another chance to clear PageMlocked. If we successfully * isolate the page and try_to_munlock() detects other VM_LOCKED vmas * mapping the page, it will restore the PageMlocked state, unless the page - * is mapped in a non-linear vma. So, we go ahead and SetPageMlocked(), + * is mapped in a non-linear vma. So, we go ahead and ClearPageMlocked(), * perhaps redundantly. * If we lose the isolation race, and the page is mapped by other VM_LOCKED * vmas, we'll detect this in vmscan--via try_to_munlock() or try_to_unmap() * either of which will restore the PageMlocked state by calling * mlock_vma_page() above, if it can grab the vma's mmap sem. */ -static void munlock_vma_page(struct page *page) +void munlock_vma_page(struct page *page) { BUG_ON(!PageLocked(page)); _ Patches currently in -mm which might be from hugh.dickins@xxxxxxxxxxxxx are origin.patch linux-next.patch vfs-fsstack-handle-32-bit-smp-preempt-large-files-in-fsstack_copy_inode_size.patch ksm-memory-hotremove-migration-only-fix.patch elf-kill-use_elf_core_dump.patch prio_tree-debugging-patch.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html