On Tuesday 09 October 2007 02:54, Peter Zijlstra wrote:
> It seems that with the recent usage of ->page_mkwrite() a little detail
> was overlooked.
>
> .22-rc1 merged OCFS2 usage of this hook
> .23-rc1 merged XFS usage
> .24-rc1 will most likely merge NFS usage
>
> Please consider this for .23 final and maybe even .22.x
>
> ---
> Subject: mm: set_page_dirty_balance() vs ->page_mkwrite()
>
> All the current page_mkwrite() implementations also set the page dirty.
> Which results in the set_page_dirty_balance() call to _not_ call balance,
> because the page is already found dirty.
>
> This allows us to dirty a _lot_ of pages without ever hitting
> balance_dirty_pages(). Not good (tm).
>
> Force a balance call if ->page_mkwrite() was successful.
Would it be better to just have the callers set_page_dirty_balance()?
> Signed-off-by: Peter Zijlstra <[email protected]>
> ---
> include/linux/writeback.h | 2 +-
> mm/memory.c | 9 +++++++--
> mm/page-writeback.c | 4 ++--
> 3 files changed, 10 insertions(+), 5 deletions(-)
>
> Index: linux-2.6/include/linux/writeback.h
> ===================================================================
> --- linux-2.6.orig/include/linux/writeback.h
> +++ linux-2.6/include/linux/writeback.h
> @@ -137,7 +137,7 @@ int sync_page_range(struct inode *inode,
> loff_t pos, loff_t count);
> int sync_page_range_nolock(struct inode *inode, struct address_space
> *mapping, loff_t pos, loff_t count);
> -void set_page_dirty_balance(struct page *page);
> +void set_page_dirty_balance(struct page *page, int page_mkwrite);
> void writeback_set_ratelimit(void);
>
> /* pdflush.c */
> Index: linux-2.6/mm/memory.c
> ===================================================================
> --- linux-2.6.orig/mm/memory.c
> +++ linux-2.6/mm/memory.c
> @@ -1559,6 +1559,7 @@ static int do_wp_page(struct mm_struct *
> struct page *old_page, *new_page;
> pte_t entry;
> int reuse = 0, ret = 0;
> + int page_mkwrite = 0;
> struct page *dirty_page = NULL;
>
> old_page = vm_normal_page(vma, address, orig_pte);
> @@ -1607,6 +1608,8 @@ static int do_wp_page(struct mm_struct *
> page_cache_release(old_page);
> if (!pte_same(*page_table, orig_pte))
> goto unlock;
> +
> + page_mkwrite = 1;
> }
> dirty_page = old_page;
> get_page(dirty_page);
> @@ -1691,7 +1694,7 @@ unlock:
> * do_no_page is protected similarly.
> */
> wait_on_page_locked(dirty_page);
> - set_page_dirty_balance(dirty_page);
> + set_page_dirty_balance(dirty_page, page_mkwrite);
> put_page(dirty_page);
> }
> return ret;
> @@ -2238,6 +2241,7 @@ static int __do_fault(struct mm_struct *
> struct page *dirty_page = NULL;
> struct vm_fault vmf;
> int ret;
> + int page_mkwrite = 0;
>
> vmf.virtual_address = (void __user *)(address & PAGE_MASK);
> vmf.pgoff = pgoff;
> @@ -2315,6 +2319,7 @@ static int __do_fault(struct mm_struct *
> anon = 1; /* no anon but release vmf.page */
> goto out;
> }
> + page_mkwrite = 1;
> }
> }
>
> @@ -2375,7 +2380,7 @@ out_unlocked:
> if (anon)
> page_cache_release(vmf.page);
> else if (dirty_page) {
> - set_page_dirty_balance(dirty_page);
> + set_page_dirty_balance(dirty_page, page_mkwrite);
> put_page(dirty_page);
> }
>
> Index: linux-2.6/mm/page-writeback.c
> ===================================================================
> --- linux-2.6.orig/mm/page-writeback.c
> +++ linux-2.6/mm/page-writeback.c
> @@ -460,9 +460,9 @@ static void balance_dirty_pages(struct a
> pdflush_operation(background_writeout, 0);
> }
>
> -void set_page_dirty_balance(struct page *page)
> +void set_page_dirty_balance(struct page *page, int page_mkwrite)
> {
> - if (set_page_dirty(page)) {
> + if (set_page_dirty(page) || page_mkwrite) {
> struct address_space *mapping = page_mapping(page);
>
> if (mapping)
-
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