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authorDavid Vrabel <david.vrabel@citrix.com>2015-03-11 14:49:57 +0000
committerDavid Vrabel <david.vrabel@citrix.com>2015-03-16 14:49:15 +0000
commit4e8c0c8c4bf3a5b5c98046e146ab3884bf7a7d0e (patch)
treee2da5980fd405c7109a342b13f0a2a1214f94b61 /arch/arm/xen
parent628c28eefd6f2cef03b212081b466ae43fd093a3 (diff)
downloadlinux-4e8c0c8c4bf3a5b5c98046e146ab3884bf7a7d0e.tar.bz2
xen/privcmd: improve performance of MMAPBATCH_V2
Make the IOCTL_PRIVCMD_MMAPBATCH_V2 (and older V1 version) map multiple frames at a time rather than one at a time, despite the pages being non-consecutive GFNs. xen_remap_foreign_mfn_array() is added which maps an array of GFNs (instead of a consecutive range of GFNs). Since per-frame errors are returned in an array, privcmd must set the MMAPBATCH_V1 error bits as part of the "report errors" phase, after all the frames are mapped. Migrate times are significantly improved (when using a PV toolstack domain). For example, for an idle 12 GiB PV guest: Before After real 0m38.179s 0m26.868s user 0m15.096s 0m13.652s sys 0m28.988s 0m18.732s Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'arch/arm/xen')
-rw-r--r--arch/arm/xen/enlighten.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 5c04389fc9ef..224081ccc92f 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -53,15 +53,27 @@ EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
static __read_mostly int xen_events_irq = -1;
-int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
+int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
unsigned long addr,
- xen_pfn_t mfn, int nr,
- pgprot_t prot, unsigned domid,
+ xen_pfn_t *mfn, int nr,
+ int *err_ptr, pgprot_t prot,
+ unsigned domid,
struct page **pages)
{
- return xen_xlate_remap_gfn_range(vma, addr, mfn, nr,
+ return xen_xlate_remap_gfn_array(vma, addr, mfn, nr, err_ptr,
prot, domid, pages);
}
+EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
+
+/* Not used by XENFEAT_auto_translated guests. */
+int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
+ unsigned long addr,
+ xen_pfn_t mfn, int nr,
+ pgprot_t prot, unsigned domid,
+ struct page **pages)
+{
+ return -ENOSYS;
+}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,