Messages in this thread | | | Date | Sat, 09 Jun 2007 10:09:38 +0200 | From | Carsten Otte <> | Subject | Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP |
| |
Justin Treon wrote: > --- Carsten Otte <cotte@de.ibm.com> wrote: >> The nice thing about this approach is: we use page->count and rmap, >> both already exist and are perfectly suited for our purpose. >> The downside: We need mem_map[] struct page entries behind all memory >> segments. Nowerdays we can easily create those via vmem_map/sparsemem. > Can you give an example of the proper way to use sparsemem in this case? We use vmem_map on 390: - __segment_load[arch/s390/mm/extmem.c] calls add_shared_memory() to create struct page entries behind a segment - segment_unload (same file) calls remove_shared_memory() to remove parts of the mem_map array again - arch/s390/mm/vmem.c implements both callbacks
As far as I know, this can also be archived with sparsemem. Unfortunately I don't have an example for sparsemem at hand, I would try to use sparse_add_one_section()[mm/sparse.c].
sorry, Carsten - 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/
| |