Messages in this thread Patch in this message | | | From | Julien Grall <> | Subject | [RFC 10/23] xen/biomerge: WORKAROUND always says the biovec are not mergeable | Date | Thu, 14 May 2015 18:00:50 +0100 |
| |
When Linux is using 64K page granularity, every page will be slipt in multiple non-contiguous 4K MFN.
I'm not sure how to handle efficiently the check to know whether we can merge 2 biovec with a such case. So for now, always says that biovec are not mergeable.
Signed-off-by: Julien Grall <julien.grall@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> --- drivers/xen/biomerge.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/xen/biomerge.c b/drivers/xen/biomerge.c index 0edb91c..20387c2 100644 --- a/drivers/xen/biomerge.c +++ b/drivers/xen/biomerge.c @@ -9,6 +9,9 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page)); unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page)); + /* TODO: Implement it correctly */ + return 0; + return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) && ((mfn1 == mfn2) || ((mfn1+1) == mfn2)); } -- 2.1.4
| |