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authorDave Hansen <dave@linux.vnet.ibm.com>2008-08-11 10:01:45 -0700
committerAvi Kivity <avi@qumranet.com>2008-10-15 10:15:18 +0200
commitf0d662759a2465babdba1160749c446648c9d159 (patch)
treed98d36f37df91bab55e2cb74cd5647fbf2bfb13e /virt
parent4d5c5d0fe89c921336b95f5e7e4f529a9df92f53 (diff)
downloadop-kernel-dev-f0d662759a2465babdba1160749c446648c9d159.zip
op-kernel-dev-f0d662759a2465babdba1160749c446648c9d159.tar.gz
KVM: Reduce kvm stack usage in kvm_arch_vm_ioctl()
On my machine with gcc 3.4, kvm uses ~2k of stack in a few select functions. This is mostly because gcc fails to notice that the different case: statements could have their stack usage combined. It overflows very nicely if interrupts happen during one of these large uses. This patch uses two methods for reducing stack usage. 1. dynamically allocate large objects instead of putting on the stack. 2. Use a union{} member for all of the case variables. This tricks gcc into combining them all into a single stack allocation. (There's also a comment on this) Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions
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