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Re: [Xen-devel] Insane contiguous physical memory requirements in blkbk/
| To: | "Stephen C. Tweedie" <sct@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Insane contiguous physical memory requirements in blkbk/blktap |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 05 Oct 2006 17:43:37 +0100 |
| Cc: | Aron Griffis <aron@xxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 05 Oct 2006 09:45:05 -0700 |
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| Thread-topic: | [Xen-devel] Insane contiguous physical memory requirements in blkbk/blktap |
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On 5/10/06 17:40, "Stephen C. Tweedie" <sct@xxxxxxxxxx> wrote: > OK, I was looking at blkback in this case. Indexing is easy, we already > have page->index for that purpose, and I don't think there's anything > else using that for these pages once they are detached from the main VM. > > Is there any reason we're not using memory in the vmalloc area for these > things? That memory is *supposed* to be allocated out for virtual use > on demand. In most cases we want the 'struct page' as well as the virtual address space. For example, to stuff into skbuff fragment lists or block-device scatter-gather lists. Kmalloc() gets us both those things -- it's just the underlying mapped RAM we don't want. ;-) -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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