On Thu, 2007-11-15 at 20:57 +0100, Miklos Szeredi wrote: > > The next point then, I'd expect your fuse_page_mkwrite() to push > > writeout of your 32-odd mmap pages instead of poll. > > You're talking about this: > > + wait_event(fc->writeback_waitq, > + fc->numwrite < FUSE_WRITEBACK_THRESHOLD); > > right? It's one of the things I need to clean out, there's no point > in fc->numwrite, which is essentially the same as the BDI_WRITEBACK > counter. > > OTOH, I'm thinking about adding a per-fs limit (adjustable for > privileged mounts) of dirty+writeback. > > I'm not sure how hard would it be to add support for this into > balance_dirty_pages(). So I'm thinking of a parameter in struct > backing_dev_info that is used to clip the calculated per-bdi threshold > below this maximum. > > How would that affect the proportions algorithm? What would happen to > the unused portion? Would it adapt to the slowed writeback and > allocate it to some other writer? The unused part is gone, I've not yet found a way to re-distribute this fairly. [ It's one of my open-problems, I can do a min_ratio per bdi, but not yet a max_ratio ] - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
