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| author | David Vrabel <david.vrabel@citrix.com> | 2015-03-11 14:49:57 +0000 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-03-16 14:49:15 +0000 |
| commit | 4e8c0c8c4bf3a5b5c98046e146ab3884bf7a7d0e (patch) | |
| tree | e2da5980fd405c7109a342b13f0a2a1214f94b61 /arch/arm/xen | |
| parent | 628c28eefd6f2cef03b212081b466ae43fd093a3 (diff) | |
| download | lwn-4e8c0c8c4bf3a5b5c98046e146ab3884bf7a7d0e.tar.gz lwn-4e8c0c8c4bf3a5b5c98046e146ab3884bf7a7d0e.zip | |
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.c | 20 |
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, |