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

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...

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Follow-Ups:
- Re: [PATCH] writeback: avoid possible balance_dirty_pages() lockup on a light-load bdi
  - From: Chuck Ebbert <[email protected]>

References:
- Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?)
  - From: Chuck Ebbert <[email protected]>
- [PATCH] writeback: avoid possible balance_dirty_pages() lockup on a light-load bdi
  - From: Fengguang Wu <[email protected]>
- Re: [PATCH] writeback: avoid possible balance_dirty_pages() lockup on a light-load bdi
  - From: Andrew Morton <[email protected]>

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