lkml.org 
[lkml]   [2015]   [May]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[RFC 10/23] xen/biomerge: WORKAROUND always says the biovec are not mergeable
    Date
    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


    \
     
     \ /
      Last update: 2015-05-14 20:01    [W:4.143 / U:1.152 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site