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mmap: handle mlocked pages during map, remap, unmap

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Originally by Nick Piggin <npiggin@suse.de>

Remove mlocked pages from the LRU using "unevictable infrastructure"
during mmap(), munmap(), mremap() and truncate().  Try to move back to
normal LRU lists on munmap() when last mlocked mapping removed.  Remove
PageMlocked() status when page truncated from file.

[akpm@linux-foundation.org: cleanup]
[kamezawa.hiroyu@jp.fujitsu.com: fix double unlock_page()]
[kosaki.motohiro@jp.fujitsu.com: split LRU: munlock rework]
[lee.schermerhorn@hp.com: mlock: fix __mlock_vma_pages_range comment block]
[akpm@linux-foundation.org: remove bogus kerneldoc token]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamewzawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel
2008-10-18 20:26:50 -07:00
committed by Linus Torvalds
parent 8edb08caf6
commit ba470de431
6 changed files with 180 additions and 160 deletions
Download Patch File Download Diff File Expand all files Collapse all files
mm/fremap.c
+22 -5
View File
@@ -21,6 +21,8 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include "internal.h"
static void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
@@ -215,15 +217,31 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
spin_unlock(&mapping->i_mmap_lock);
}
if (vma->vm_flags & VM_LOCKED) {
/*
* drop PG_Mlocked flag for over-mapped range
*/
unsigned int saved_flags = vma->vm_flags;
munlock_vma_pages_range(vma, start, start + size);
vma->vm_flags = saved_flags;
}
mmu_notifier_invalidate_range_start(mm, start, start + size);
err = populate_range(mm, vma, start, size, pgoff);
mmu_notifier_invalidate_range_end(mm, start, start + size);
if (!err && !(flags & MAP_NONBLOCK)) {
if (unlikely(has_write_lock)) {
downgrade_write(&mm->mmap_sem);
has_write_lock = 0;
if (vma->vm_flags & VM_LOCKED) {
/*
* might be mapping previously unmapped range of file
*/
mlock_vma_pages_range(vma, start, start + size);
} else {
if (unlikely(has_write_lock)) {
downgrade_write(&mm->mmap_sem);
has_write_lock = 0;
}
make_pages_present(start, start+size);
}
make_pages_present(start, start+size);
}
/*
@@ -240,4 +258,3 @@ out:
return err;
}