Messages in this thread |  | | From | Andreas Grünbacher <> | Date | Sat, 24 Jul 2021 10:05:17 +0200 | Subject | Re: [PATCH v3 1/7] iov_iter: Introduce fault_in_iov_iter helper |
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Am Sa., 24. Juli 2021 um 03:53 Uhr schrieb Al Viro <viro@zeniv.linux.org.uk>: > On Fri, Jul 23, 2021 at 10:58:34PM +0200, Andreas Gruenbacher wrote: > > Introduce a new fault_in_iov_iter helper for manually faulting in an iterator. > > Other than fault_in_pages_writeable(), this function is non-destructive. > > > > We'll use fault_in_iov_iter in gfs2 once we've determined that the iterator > > passed to .read_iter or .write_iter isn't in memory. > > Hmm... I suspect that this is going to be much heavier for read access > than the existing variant. Do we ever want it for anything other than > writes?
I don't know if it actually is slower when pages need to be faulted in, but I'm fine turning it into a write-only function.
Thanks, Andreas
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