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Subject[PATCH 0/12] Per-bdi writeback flusher threads v7

Here's the 7th version of the writeback patches. Changes since

- Move the sync_supers() to the global bdi_forker_task() thread, so we
don't writeback the supers from all the bdi kupdated() tasks.
- Make bdi_start_writeback() and bdi_writeback_all() be sync when called
with WB_SYNC_ALL only.
- Shuffle some more things around to make a cleaner series. The sync vs
async nature of bdi_writeback_all() and bdi_start_writeback() isn't
consistent through the series, but otherwise things should be sane.

I'd appreciate if Richard and Yanmin could re-run testing with this,
just to make sure that things are sane. For ease of patching, I've
put the full diff here:

and also stored this in a writeback-v7 branch that will not change,
you can pull that into Linus tree from here:

git:// writeback-v7

Jens Axboe

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