Messages in this thread | | | Date | Wed, 14 Jan 2015 09:43:53 +0100 | From | Richard Weinberger <> | Subject | Re: [PATCH] hostfs: Use noop_fsync for directories |
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Am 14.01.2015 um 09:39 schrieb Christoph Hellwig: > On Tue, Jan 13, 2015 at 11:26:38PM +0100, Richard Weinberger wrote: >> hostfs tries do reduce the amount of syscall between guest and host as much >> as possible. For file operations it passes everything down to the host but >> for directory operations only ->iterate() does. >> >> It is already horrible slow, if we add an ->open() for directory too it would >> get even more slower. :-( > > This sounds fairlt dangerous. At least add some good documentation > explaining these semantics.
Understood. Maybe it is time to rebenchmark hostfs with full directory pass-through support. Daniel, are you interested in a small kernel project? As explained on IRC adding real support for directory fsync() should be an easy task. The only interesting point is how much overhead it will add.
Thanks, //richard
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