Messages in this thread | | | From | "Manfred Spraul" <> | Subject | Re: Hashing and directories | Date | Wed, 7 Mar 2001 17:23:26 +0100 |
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From: "Jamie Lokier" <lk@tantalophile.demon.co.uk> > Manfred Spraul wrote: > > I'm not sure that this is the right way: It means that every exec() > > must call dup_mmap(), and usually only to copy a few hundert > > bytes. But I don't see a sane alternative. I won't propose to > > create a temporary file in a kernel tmpfs mount ;-) > > Every exec creates a whole new mm anyway, after copying data from the > old mm. The suggestion is to create the new mm before copying the > data, and to copy the data from the old mm directly to the new one. >
exec_mmap currenly avoids mm_alloc()/activate_mm()/mm_drop() for single threaded apps, and that would become impossible. I'm not sure how expensive these calls are.
-- Manfred
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