semi-stable page writes

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Hi everyone,

Are people still annoyed about writes taking unexpectedly long amounts of tme
due to the stable page write patchset?  I'm guessing yes...

I'm close to posting a patchset that (a) gates the wait_on_page_writeback calls
on a flag that you can set in the bdi to indicate that you need stable writes
(which blk_integrity_register will set); (b) (ab)uses a page flag bit (PG_slab)
to indicate that a page is actually being sent out to disk hardware; and (c)
changes the three calls to wait_on_page_writeback()s that were in the original
patchset to only wait if the bit in (b) is set.  Sort of a hack, but it'll fix
some of the latency complaints.

I guess I should let that run overnight, and clean up/mail out the set tomorrow.

--D
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