Tests show that the original large intervals can easily make the dirty limit exceeded on 100 concurrent dd's. So adapt to as large as the next check point selected by the dirty throttling algorithm. Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> --- fs/btrfs/file.c | 2 ++ 1 file changed, 2 insertions(+) --- linux-next.orig/fs/btrfs/file.c 2011-11-17 20:18:51.000000000 +0800 +++ linux-next/fs/btrfs/file.c 2011-11-17 20:18:55.000000000 +0800 @@ -1168,6 +1168,8 @@ static noinline ssize_t __btrfs_buffered nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE, PAGE_CACHE_SIZE / (sizeof(struct page *))); + nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied); + nrptrs = max(nrptrs, 8); pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); if (!pages) return -ENOMEM; -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
