mm: task dirty accounting fix
YAMAMOTO-san noticed that task_dirty_inc doesn't seem to be called properly for cases where set_page_dirty is not used to dirty a page (eg. mark_buffer_dirty). Additionally, there is some inconsistency about when task_dirty_inc is called. It is used for dirty balancing, however it even gets called for __set_page_dirty_no_writeback. So rather than increment it in a set_page_dirty wrapper, move it down to exactly where the dirty page accounting stats are incremented. Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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610d18f412
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3 changed files with 5 additions and 10 deletions
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@ -777,6 +777,7 @@ static int __set_page_dirty(struct page *page,
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__inc_zone_page_state(page, NR_FILE_DIRTY);
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__inc_zone_page_state(page, NR_FILE_DIRTY);
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__inc_bdi_stat(mapping->backing_dev_info,
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__inc_bdi_stat(mapping->backing_dev_info,
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BDI_RECLAIMABLE);
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BDI_RECLAIMABLE);
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task_dirty_inc(current);
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task_io_account_write(PAGE_CACHE_SIZE);
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task_io_account_write(PAGE_CACHE_SIZE);
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}
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}
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radix_tree_tag_set(&mapping->page_tree,
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radix_tree_tag_set(&mapping->page_tree,
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@ -1159,6 +1159,7 @@ extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
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/* mm/page-writeback.c */
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/* mm/page-writeback.c */
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int write_one_page(struct page *page, int wait);
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int write_one_page(struct page *page, int wait);
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void task_dirty_inc(struct task_struct *tsk);
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/* readahead.c */
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/* readahead.c */
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#define VM_MAX_READAHEAD 128 /* kbytes */
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#define VM_MAX_READAHEAD 128 /* kbytes */
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@ -240,7 +240,7 @@ void bdi_writeout_inc(struct backing_dev_info *bdi)
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}
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}
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EXPORT_SYMBOL_GPL(bdi_writeout_inc);
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EXPORT_SYMBOL_GPL(bdi_writeout_inc);
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static inline void task_dirty_inc(struct task_struct *tsk)
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void task_dirty_inc(struct task_struct *tsk)
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{
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{
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prop_inc_single(&vm_dirties, &tsk->dirties);
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prop_inc_single(&vm_dirties, &tsk->dirties);
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}
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}
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@ -1230,6 +1230,7 @@ int __set_page_dirty_nobuffers(struct page *page)
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__inc_zone_page_state(page, NR_FILE_DIRTY);
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__inc_zone_page_state(page, NR_FILE_DIRTY);
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__inc_bdi_stat(mapping->backing_dev_info,
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__inc_bdi_stat(mapping->backing_dev_info,
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BDI_RECLAIMABLE);
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BDI_RECLAIMABLE);
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task_dirty_inc(current);
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task_io_account_write(PAGE_CACHE_SIZE);
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task_io_account_write(PAGE_CACHE_SIZE);
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}
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}
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radix_tree_tag_set(&mapping->page_tree,
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radix_tree_tag_set(&mapping->page_tree,
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@ -1262,7 +1263,7 @@ EXPORT_SYMBOL(redirty_page_for_writepage);
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* If the mapping doesn't provide a set_page_dirty a_op, then
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* If the mapping doesn't provide a set_page_dirty a_op, then
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* just fall through and assume that it wants buffer_heads.
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* just fall through and assume that it wants buffer_heads.
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*/
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*/
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static int __set_page_dirty(struct page *page)
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int set_page_dirty(struct page *page)
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{
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{
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struct address_space *mapping = page_mapping(page);
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struct address_space *mapping = page_mapping(page);
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@ -1280,14 +1281,6 @@ static int __set_page_dirty(struct page *page)
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}
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}
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return 0;
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return 0;
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}
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}
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int set_page_dirty(struct page *page)
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{
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int ret = __set_page_dirty(page);
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if (ret)
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task_dirty_inc(current);
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return ret;
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}
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EXPORT_SYMBOL(set_page_dirty);
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EXPORT_SYMBOL(set_page_dirty);
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/*
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/*
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