On Wed, Mar 28, 2018 at 09:26:33AM +0200, Christoph Hellwig wrote:

Hi all,

this patch adds workqueue based fsync offload.  Version of this
patch have been floating around for a couple years, but we now
have a user with seastar used by ScyllaDB (who sponsored this
work) that really wants this in addition to the aio poll support.
More details are in the patch itself.

Because the iocb types have been defined sine day one (and probably
were supported by RHEL3) libaio already supports these calls as-is.

This also pulls in the aio cleanups and io_pgetevents support previously
submitted and review as part of the aio poll series.  The aio poll
series will be resubmitted on top of this series

BTW, this is only tangentially related, but... does *anything* call
io_submit() for huge amounts of iocb?  Check in do_io_submit() is
insane - "no more than MAX_LONG total of _pointers_".  Compat variant
goes for "no more than a page worth of pointers" and there's
a hard limit in ioctx_alloc() - we can't ever get more than
8M slots in ring buffer...

--
To unsubscribe, send a message with 'unsubscribe linux-aio' in
the body to majordomo@kvack.org.  For more info on Linux AIO,
see: http://www.kvack.org/aio/
Don't email: <a href=mailto:"aart@kvack.org">aart@kvack.org</a>