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authorK. Y. Srinivasan <kys@microsoft.com>2014-04-09 05:45:53 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-04 03:24:26 +0400
commitd3ba720dd58cdf6630fee4b89482c465d5ad0d0f (patch)
tree03ea0aba6f0509bf7c501dee9ae6e931634f3c4b /include/linux/hyperv.h
parente4d8270e604c3202131bac607969605ac397b893 (diff)
downloadlinux-d3ba720dd58cdf6630fee4b89482c465d5ad0d0f.tar.xz
Drivers: hv: Eliminate the channel spinlock in the callback path
By ensuring that we set the callback handler to NULL in the channel close path on the same CPU that the channel is bound to, we can eliminate this lock acquisition and release in a performance critical path. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/hyperv.h')
-rw-r--r--include/linux/hyperv.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2d7b4f139c32..a274e089df78 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -696,6 +696,8 @@ struct vmbus_channel {
* preserve the earlier behavior.
*/
u32 target_vp;
+ /* The corresponding CPUID in the guest */
+ u32 target_cpu;
/*
* Support for sub-channels. For high performance devices,
* it will be useful to have multiple sub-channels to support