On Thu, 2007-11-01 at 17:49 +0100, Miklos Szeredi wrote: > Hi, > > It looks like bdi_thresh will always be zero if filesystem does > synchronous writepage, resulting in very poor write performance. > > Hostfs (UML) is one such example, but there might be others. > > The only solution I can think of is to add a set_page_writeback(); > end_page_writeback() pair (or some reduced variant, that only does > the proportions magic). But that means auditing quite a few > filesystems... Ouch... I take it there is no other function that is shared between all these writeout paths which we could stick a bdi_writeout_inc(bdi) in?
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