Re: [PATCH] writeback: avoid possible balance_dirty_pages() lockup on a light-load bdi

Fengguang Wu
2007-10-02T13:27:18Z

On Tue, Oct 02, 2007 at 08:13:27PM +0800, Fengguang Wu wrote:
[...]
> One more serious problem is, a busy writer could also drain all the
> dirty pages and make (nr_writeback == dirty_limit+1MB). In that case,
> I suspect the light-load sdb writer still have good chance to
> make progress(need confirmation).

Well it seems to be a really tricky issue without knowing the per-bdi
numbers. Maybe we could just encourage users to upgrade to 2.6.24...