Messages in this thread | | | Date | Wed, 7 Mar 2001 19:53:23 +0100 | From | Jens Axboe <> | Subject | Re: 64-bit capable block device layer |
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On Wed, Mar 07 2001, Rik van Riel wrote: > > > how would you feel about having the block device layer 64-bit > > > capable, so Linux can have block devices of more than 2GB in > > > size ? > > > > I already did this here, or something similar at least. Using > > a sector_t type that is 64-bit, regardless of platform. Is it > > really worth it to differentiate and use 32-bit types for old > > machines? > > Wonderful ! > > I'm not sure how expensive 64-bit arithmetic would be on > eg. 386, 486 or 68k machines, or how much impact the extra > memory taken would have. > > OTOH, I'm not sure what problems it could give to make this > a compile-time option...
Plus compile time options are nasty :-). It would probably make bigger sense to completely skip all the merging etc for low end machines. I think they already do this for embedded kernels (ie removing ll_rw_blk.c and elevator.c). That avoids most of the 64-bit arithmetic anyway.
-- Jens Axboe
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