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authorAndrew Morton <akpm@osdl.org>2006-03-24 03:18:12 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-24 07:33:26 -0800
commit9c50823eebf7c256b92b4e0f02b5fb30e97788c2 (patch)
tree241b754698c3501355d1061c828ab6d894dba617 /mm/msync.c
parent4741c9fd36b3bcadd37238321c469049da94a4b9 (diff)
downloadlinux-sh-9c50823eebf7c256b92b4e0f02b5fb30e97788c2.tar.gz
[PATCH] msync(): perform dirty page levelling
It seems sensible to perform dirty page throttling in msync: as the application dirties pages we can kick off pdflush early, or even force the msync() caller to perform writeout, or even throttle the msync() caller. The main effect of this is to start disk writeback earlier if we've just discovered that a large amount of pagecache has been dirtied. (Otherwise it wouldn't happen for up to five seconds, next time pdflush wakes up). It also will cause the page-dirtying process to get panalised for dirtying those pages rather than whacking someone else with the problem. We should do this for munmap() and possibly even exit(), too. We drop the mmap_sem while performing the dirty page balancing. It doesn't seem right to hold mmap_sem for that long. Note that this patch only affects MS_ASYNC. MS_SYNC will be syncing all the dirty pages anyway. We note that msync(MS_SYNC) does a full-file-sync inside mmap_sem, and always has. We can fix that up... The patch also tightens up the mmap_sem coverage in sys_msync(): no point in taking it while we perform the incoming arg checking. Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/msync.c')
-rw-r--r--mm/msync.c93
1 files changed, 61 insertions, 32 deletions
diff --git a/mm/msync.c b/mm/msync.c
index 3563a56e1a51..8a66f5d5d4f0 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -12,17 +12,20 @@
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/hugetlb.h>
+#include <linux/writeback.h>
+#include <linux/file.h>
#include <linux/syscalls.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
-static void msync_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+static unsigned long msync_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end)
{
pte_t *pte;
spinlock_t *ptl;
int progress = 0;
+ unsigned long ret = 0;
again:
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
@@ -43,58 +46,64 @@ again:
if (!page)
continue;
if (ptep_clear_flush_dirty(vma, addr, pte) ||
- page_test_and_clear_dirty(page))
- set_page_dirty(page);
+ page_test_and_clear_dirty(page))
+ ret += set_page_dirty(page);
progress += 3;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
if (addr != end)
goto again;
+ return ret;
}
-static inline void msync_pmd_range(struct vm_area_struct *vma, pud_t *pud,
- unsigned long addr, unsigned long end)
+static inline unsigned long msync_pmd_range(struct vm_area_struct *vma,
+ pud_t *pud, unsigned long addr, unsigned long end)
{
pmd_t *pmd;
unsigned long next;
+ unsigned long ret = 0;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
- msync_pte_range(vma, pmd, addr, next);
+ ret += msync_pte_range(vma, pmd, addr, next);
} while (pmd++, addr = next, addr != end);
+ return ret;
}
-static inline void msync_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
- unsigned long addr, unsigned long end)
+static inline unsigned long msync_pud_range(struct vm_area_struct *vma,
+ pgd_t *pgd, unsigned long addr, unsigned long end)
{
pud_t *pud;
unsigned long next;
+ unsigned long ret = 0;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- msync_pmd_range(vma, pud, addr, next);
+ ret += msync_pmd_range(vma, pud, addr, next);
} while (pud++, addr = next, addr != end);
+ return ret;
}
-static void msync_page_range(struct vm_area_struct *vma,
+static unsigned long msync_page_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end)
{
pgd_t *pgd;
unsigned long next;
+ unsigned long ret = 0;
/* For hugepages we can't go walking the page table normally,
* but that's ok, hugetlbfs is memory based, so we don't need
* to do anything more on an msync().
*/
if (vma->vm_flags & VM_HUGETLB)
- return;
+ return 0;
BUG_ON(addr >= end);
pgd = pgd_offset(vma->vm_mm, addr);
@@ -103,8 +112,9 @@ static void msync_page_range(struct vm_area_struct *vma,
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- msync_pud_range(vma, pgd, addr, next);
+ ret += msync_pud_range(vma, pgd, addr, next);
} while (pgd++, addr = next, addr != end);
+ return ret;
}
/*
@@ -118,8 +128,9 @@ static void msync_page_range(struct vm_area_struct *vma,
* So my _not_ starting I/O in MS_ASYNC we provide complete flexibility to
* applications.
*/
-static int msync_interval(struct vm_area_struct *vma,
- unsigned long addr, unsigned long end, int flags)
+static int msync_interval(struct vm_area_struct *vma, unsigned long addr,
+ unsigned long end, int flags,
+ unsigned long *nr_pages_dirtied)
{
int ret = 0;
struct file *file = vma->vm_file;
@@ -128,7 +139,7 @@ static int msync_interval(struct vm_area_struct *vma,
return -EBUSY;
if (file && (vma->vm_flags & VM_SHARED)) {
- msync_page_range(vma, addr, end);
+ *nr_pages_dirtied = msync_page_range(vma, addr, end);
if (flags & MS_SYNC) {
struct address_space *mapping = file->f_mapping;
@@ -157,11 +168,8 @@ asmlinkage long sys_msync(unsigned long start, size_t len, int flags)
unsigned long end;
struct vm_area_struct *vma;
int unmapped_error, error = -EINVAL;
+ int done = 0;
- if (flags & MS_SYNC)
- current->flags |= PF_SYNCWRITE;
-
- down_read(&current->mm->mmap_sem);
if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
goto out;
if (start & ~PAGE_MASK)
@@ -180,13 +188,19 @@ asmlinkage long sys_msync(unsigned long start, size_t len, int flags)
* If the interval [start,end) covers some unmapped address ranges,
* just ignore them, but return -ENOMEM at the end.
*/
+ down_read(&current->mm->mmap_sem);
+ if (flags & MS_SYNC)
+ current->flags |= PF_SYNCWRITE;
vma = find_vma(current->mm, start);
unmapped_error = 0;
- for (;;) {
+ do {
+ unsigned long nr_pages_dirtied = 0;
+ struct file *file;
+
/* Still start < end. */
error = -ENOMEM;
if (!vma)
- goto out;
+ goto out_unlock;
/* Here start < vma->vm_end. */
if (start < vma->vm_start) {
unmapped_error = -ENOMEM;
@@ -195,22 +209,37 @@ asmlinkage long sys_msync(unsigned long start, size_t len, int flags)
/* Here vma->vm_start <= start < vma->vm_end. */
if (end <= vma->vm_end) {
if (start < end) {
- error = msync_interval(vma, start, end, flags);
+ error = msync_interval(vma, start, end, flags,
+ &nr_pages_dirtied);
if (error)
- goto out;
+ goto out_unlock;
}
error = unmapped_error;
- goto out;
+ done = 1;
+ } else {
+ /* Here vma->vm_start <= start < vma->vm_end < end. */
+ error = msync_interval(vma, start, vma->vm_end, flags,
+ &nr_pages_dirtied);
+ if (error)
+ goto out_unlock;
}
- /* Here vma->vm_start <= start < vma->vm_end < end. */
- error = msync_interval(vma, start, vma->vm_end, flags);
- if (error)
- goto out;
+ file = vma->vm_file;
start = vma->vm_end;
- vma = vma->vm_next;
- }
-out:
- up_read(&current->mm->mmap_sem);
+ if ((flags & MS_ASYNC) && file && nr_pages_dirtied) {
+ get_file(file);
+ up_read(&current->mm->mmap_sem);
+ balance_dirty_pages_ratelimited_nr(file->f_mapping,
+ nr_pages_dirtied);
+ fput(file);
+ down_read(&current->mm->mmap_sem);
+ vma = find_vma(current->mm, start);
+ } else {
+ vma = vma->vm_next;
+ }
+ } while (!done);
+out_unlock:
current->flags &= ~PF_SYNCWRITE;
+ up_read(&current->mm->mmap_sem);
+out:
return error;
}