btrfs: fix dirtied pages accounting on sub-page writes
When doing 1KB sequential writes to the same page, balance_dirty_pages_ratelimited_nr() should be called once instead of 4 times, the latter makes the dirtier tasks be throttled much too heavy. Fix it with proper de-accounting on clear_page_dirty_for_io(). CC: Chris Mason <chris.mason@oracle.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
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@ -1136,7 +1136,8 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
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GFP_NOFS);
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}
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for (i = 0; i < num_pages; i++) {
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clear_page_dirty_for_io(pages[i]);
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if (clear_page_dirty_for_io(pages[i]))
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account_page_redirty(pages[i]);
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set_page_extent_mapped(pages[i]);
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WARN_ON(!PageLocked(pages[i]));
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}
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