Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: [BUG] get_unmapped_area() change -> non booting machine | Date | Fri, 13 Feb 2004 06:26:10 +0000 (UTC) |
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Followup to: <Pine.LNX.4.58.0402120833000.5816@home.osdl.org> By author: Linus Torvalds <torvalds@osdl.org> In newsgroup: linux.dev.kernel > > I really think that we should aim for "brk()" just working. It's often > faster than mmap, and it's one of those very basic things (ie we should > _not_ assume we have glibc and malloc(), and others may well want to use > brk() too). >
Okay... I'll ask... what is the point with brk(), i.e. what makes it faster? If we didn't have brk(), we could get rid of UNMAPPED_BASE and therefore get rid of the artificial splitting of userspace memory (modulo prelink, but that's optional.)
brk() at least on the surface really looks like a strange legacy interface. Obviously it's important on nommu architectures, but on mmu architectures it seems rather redundant.
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