Re: Bug in kernel 2.6.31, Slow wb_kupdate writeout

[Martin Bligh]

> Note that this is a simple fix that may have suboptimal write performance.
> Here is an old reasoning:
>
>        http://lkml.org/lkml/2009/3/28/235

The other thing I've been experimenting with is to disable the per-page
check in write_cache_pages, ie:

                        if (wbc->nonblocking && bdi_write_congested(bdi)) {
                                wb_stats_inc(WB_STATS_WCP_SECTION_CONG);
                                wbc->encountered_congestion = 1;
                                /* done = 1; */

This treats the congestion limits as soft, but encourages us to write
back in larger, more efficient chunks. If that's not going to scare
people unduly, I can submit that as well.
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