Messages in this thread | | | From | wind@cocodril ... | Date | Tue, 18 Mar 2003 01:12:10 +0100 | Subject | Re: 2.4 vm, program load, page faulting, ... |
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On Mon, Mar 17, 2003 at 03:28:55PM -0800, Andrew Morton wrote: > wind@cocodriloo.com wrote: > > > > > This is all a bit dubious for several reasons. Most particularly, the > > > up-front instantiation of the pages in pagetables makes unneeded pages harder > > > to reclaim. It would be really neat if someone could try putting the > > > madvise(MADV_WILLNEED) into glibc and test that. Maybe on a 2.4 kernel. > > > > > > something like this one? > > > > No, not at all. I meant a patch against glibc, not against the kernel! > > Like this: > > map = mmap(..., PROT_EXEC, ...); > + if (getenv("MAP_PREFAULT")) > + madvise(map, length, MADV_WILLNEED);
I know what you mean, but right now it's far easier hacking the kernel than libc, at least if running a uml-kernel ;)
Anyways, I booted my patch but I don't know if it's working, because I've got no test machine to try it on... but, it didn't freak out so I think it works :)))
As for the libc patch, I think it can be easier to make an exec-prefault.so library and LD_PRELOAD it, at least for testing purposes.
If you could tell me the locking is right, I might try patching my physical machine 2.4.19-ck4 with the kernel patch just to see if it works. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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