Messages in this thread | | | Date | Tue, 8 Nov 2005 14:44:42 +1100 | From | David Gibson <> | Subject | Re: [RFC 2/2] Hugetlb COW |
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On Mon, Nov 07, 2005 at 03:47:55PM -0600, Adam Litke wrote: > On Mon, 2005-11-07 at 15:38 -0600, Adam Litke wrote: > > [RFC] COW for hugepages > > (Patch originally from David Gibson <dwg@au1.ibm.com>) > > > > This patch implements copy-on-write for hugepages, hence allowing > > MAP_PRIVATE mappings of hugetlbfs. > > > > This is chiefly useful for cases where we want to use hugepages > > "automatically" - that is to map hugepages without the knowledge of > > the code in the final application (either via kernel hooks, or with > > LD_PRELOAD). We can use various heuristics to determine when > > hugepages might be a good idea, but changing the semantics of > > anonymous memory from MAP_PRIVATE to MAP_SHARED without the app's > > knowledge is clearly wrong. > > I forgot to mention in the original post that this patch is currently > broken on ppc64 due to a problem with update_mmu_cache(). The proper > fix is understood but backed up behind the powerpc merge activity.
Now that the merge tree and 64k pages have been pulled into mainline I updated this patch, and sent it off to paulus. You'll fnid it under the subject "ppc64: Make hash_preload() and update_mmu_cache() cope with hugepages".
-- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson - 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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