btrfs: lower the dirty balance poll interval

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / file.c

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index dafdfa059bf66a489bd3d858990b9025fd50a72f..52305a885c3fc9130e3129a8424c47b3ebdcd079 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1167,6 +1167,8 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
        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;