From: Michel Lespinasse <walken@google.com>
To: Andy Lutomirski <luto@amacapital.net>,
Ingo Molnar <mingo@kernel.org>, Al Viro <viro@zeniv.linux.org.uk>,
Hugh Dickins <hughd@google.com>, Jorn_Engel <joern@logfs.org>,
Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH 4/9] mm: use mm_populate() for blocking remap_file_pages()
Date: Thu, 20 Dec 2012 16:49:52 -0800 [thread overview]
Message-ID: <1356050997-2688-5-git-send-email-walken@google.com> (raw)
In-Reply-To: <1356050997-2688-1-git-send-email-walken@google.com>
Signed-off-by: Michel Lespinasse <walken@google.com>
---
mm/fremap.c | 22 ++++++----------------
1 files changed, 6 insertions(+), 16 deletions(-)
diff --git a/mm/fremap.c b/mm/fremap.c
index 2db886e31044..b42e32171530 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -129,6 +129,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
struct vm_area_struct *vma;
int err = -EINVAL;
int has_write_lock = 0;
+ vm_flags_t vm_flags;
if (prot)
return err;
@@ -228,30 +229,16 @@ get_write_lock:
/*
* drop PG_Mlocked flag for over-mapped range
*/
- vm_flags_t saved_flags = vma->vm_flags;
if (!has_write_lock)
goto get_write_lock;
+ vm_flags = vma->vm_flags;
munlock_vma_pages_range(vma, start, start + size);
- vma->vm_flags = saved_flags;
+ vma->vm_flags = vm_flags;
}
mmu_notifier_invalidate_range_start(mm, start, start + size);
err = vma->vm_ops->remap_pages(vma, start, size, pgoff);
mmu_notifier_invalidate_range_end(mm, start, start + size);
- if (!err) {
- if (vma->vm_flags & VM_LOCKED) {
- /*
- * might be mapping previously unmapped range of file
- */
- mlock_vma_pages_range(vma, start, start + size);
- } else if (!(flags & MAP_NONBLOCK)) {
- if (unlikely(has_write_lock)) {
- downgrade_write(&mm->mmap_sem);
- has_write_lock = 0;
- }
- make_pages_present(start, start+size);
- }
- }
/*
* We can't clear VM_NONLINEAR because we'd have to do
@@ -260,10 +247,13 @@ get_write_lock:
*/
out:
+ vm_flags = vma->vm_flags;
if (likely(!has_write_lock))
up_read(&mm->mmap_sem);
else
up_write(&mm->mmap_sem);
+ if (!err && ((vm_flags & VM_LOCKED) || !(flags & MAP_NONBLOCK)))
+ mm_populate(start, size);
return err;
}
--
1.7.7.3
--
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next prev parent reply other threads:[~2012-12-21 0:50 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-21 0:49 [PATCH 0/9] Avoid populating unbounded num of ptes with mmap_sem held Michel Lespinasse
2012-12-21 0:49 ` [PATCH 1/9] mm: make mlockall preserve flags other than VM_LOCKED in def_flags Michel Lespinasse
2012-12-22 4:25 ` Rik van Riel
2012-12-21 0:49 ` [PATCH 2/9] mm: remap_file_pages() fixes Michel Lespinasse
2013-01-03 0:31 ` Rik van Riel
2012-12-21 0:49 ` [PATCH 3/9] mm: introduce mm_populate() for populating new vmas Michel Lespinasse
2013-01-03 2:14 ` Rik van Riel
2012-12-21 0:49 ` Michel Lespinasse [this message]
2013-01-03 2:25 ` [PATCH 4/9] mm: use mm_populate() for blocking remap_file_pages() Rik van Riel
2013-03-10 18:55 ` Tommi Rantala
2013-03-11 23:03 ` Andrew Morton
2013-03-12 0:24 ` Michel Lespinasse
2013-03-12 4:23 ` Hillf Danton
2013-03-12 5:01 ` Michel Lespinasse
2013-03-12 20:47 ` Andrew Morton
2012-12-21 0:49 ` [PATCH 5/9] mm: use mm_populate() when adjusting brk with MCL_FUTURE in effect Michel Lespinasse
2013-01-03 2:56 ` Rik van Riel
2012-12-21 0:49 ` [PATCH 6/9] mm: use mm_populate() for mremap() of VM_LOCKED vmas Michel Lespinasse
2013-01-03 5:47 ` Rik van Riel
2012-12-21 0:49 ` [PATCH 7/9] mm: remove flags argument to mmap_region Michel Lespinasse
2013-01-03 5:49 ` Rik van Riel
2012-12-21 0:49 ` [PATCH 8/9] mm: directly use __mlock_vma_pages_range() in find_extend_vma() Michel Lespinasse
2013-01-03 5:50 ` Rik van Riel
2012-12-21 0:49 ` [PATCH 9/9] mm: introduce VM_POPULATE flag to better deal with racy userspace programs Michel Lespinasse
2013-01-03 6:20 ` Rik van Riel
2012-12-21 10:46 ` [PATCH 0/9] Avoid populating unbounded num of ptes with mmap_sem held Michel Lespinasse
2012-12-22 15:02 ` Greg Ungerer
2013-01-23 13:37 ` Greg Ungerer
2012-12-22 0:36 ` Andy Lutomirski
2012-12-22 0:59 ` Michel Lespinasse
2012-12-22 1:09 ` Andy Lutomirski
2012-12-22 1:59 ` Michel Lespinasse
2012-12-22 2:16 ` Andy Lutomirski
2012-12-22 9:37 ` Michel Lespinasse
2012-12-22 9:45 ` [PATCH 10/9] mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool Michel Lespinasse
2013-01-03 6:21 ` Rik van Riel
2013-01-03 18:54 ` Andy Lutomirski
2013-01-03 18:56 ` [PATCH 0/9] Avoid populating unbounded num of ptes with mmap_sem held Andy Lutomirski
2013-01-04 18:16 ` Andy Lutomirski
2013-01-04 22:58 ` Michel Lespinasse
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