Messages in this thread | | | Date | Tue, 7 Apr 2015 17:09:50 -0400 | From | Dave Jones <> | Subject | Re: Hang on large copy_from_user with PREEMPT_NONE |
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On Tue, Apr 07, 2015 at 11:12:31AM -0700, Linus Torvalds wrote: > On Apr 7, 2015 10:58 AM, "Dave Jones" <davej@codemonkey.org.uk> wrote: > > > > > > +#define COPY_CHUNK_SIZE (16*PAGE_SIZE) > > > > This needs to be bigger, just to accomodate things like xfs, which > > on my system is over 1mb. I think some out-of-tree modules > > (not that I care deeply) are even bigger. > > Umm. It will happily copy megabytes of data. Or gigabytes. It just doors it > in smaller chunks, and make sure to test the return value and possibly > reschedule in between.
brain no worky. You are of course, correct.
Dave
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