VMware balloon: Support 2m page ballooning.

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2m ballooning significantly reduces the hypervisor side (and guest side)
overhead of ballooning and unballooning.

hypervisor only:
      balloon  unballoon
4 KB  2 GB/s   2.6 GB/s
2 MB  54 GB/s  767 GB/s

Use 2 MB pages as the hypervisor is alwys 64bit and 2 MB is the smallest
supported super-page size.

The code has to run on older versions of ESX and old balloon drivers run on
newer version of ESX. Hence match the capabilities with the host before 2m
page ballooning could be enabled.

Signed-off-by: Xavier Deguillard <xdeguillard@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Philip P. Moltmann authored and Greg Kroah-Hartman committed 2015-10-04 12:59:11 +01:00

1 parent 33d268ed00

commit 365bd7ef7e

1 file changed

+257 -117

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drivers/misc/vmw_balloon.c

+257 -117

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