Messages in this thread | | | Date | Thu, 7 May 2015 00:16:18 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH v3 1/4] fs: kiocb: introduce IOCB_DONT_DIRTY_PAGE flag for direct IO |
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On Thu, May 07, 2015 at 01:08:23AM +0800, Ming Lei wrote: > When direct IO is submitted from kernel, it is often unnecessary > to dirty pages, for example of loop, dirtying pages have been > considered in the upper filesystem(over loop) side already, and > they don't need to be dirtied again. > > So this patch introduces IOCB_DONT_DIRTY_PAGE flag for direct IO, > and other ITER_BVEC and ITER_KVEC cases might benefit from it too. > > The patch is based on previous Dave's patch.
in-kernel I/O should never dirty the pages written to or read from, so just checking the iov_iter type should be enough.
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