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Drivers: hv: vmbus: Implement per-CPU mapping of relid to channel

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Currently the mapping of the relID to channel is done under the protection of a
single spin lock. Starting with ws2012, each channel is bound to a specific VCPU
in the guest. Use this binding to eliminate the spin lock by setting up
per-cpu state for mapping relId to the channel.

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>
This commit is contained in:
K. Y. Srinivasan 2014-04-08 18:45:54 -07:00 • committed by Greg Kroah-Hartman
parent d3ba720dd5
commit 3a28fa35d6
5 changed files with 75 additions and 2 deletions
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5
include/linux/hyperv.h
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@ -734,6 +734,11 @@ struct vmbus_channel {
* Support per-channel state for use by vmbus drivers.
*/
void *per_channel_state;
/*
* To support per-cpu lookup mapping of relid to channel,
* link up channels based on their CPU affinity.
*/
struct list_head percpu_list;
};
static inline void set_channel_read_state(struct vmbus_channel *c, bool state)