linux-kernel - [PATCH 0/6] Drivers: hv: vmbus: fair round robin algorithm for vmbus_get_outgoing

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Date:	Tue, 21 Apr 2015 16:27:34 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	Haiyang Zhang <haiyangz@...rosoft.com>,
	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH 0/6] Drivers: hv: vmbus: fair round robin algorithm for vmbus_get_outgoing_channel()

This series is a continuation of the "Drivers: hv: vmbus: Use a round-robin
algorithm for picking the outgoing channel" work. It is supposed to bring two
significant changes:
1) Subchannels for a channel are distributed evenly across all vcpus we have.
   Currently we try to distribute all channels (including subchannels) across
   all vcpus, this approach doesn't guarantee that the particular channel's
   subchannels will be distributed in the same way as we process all offer
   requests in some random order. (Patch 05)
2) Channel picking based on the current vcpu is dropped from
   vmbus_get_outgoing_channel() in favor of a fair round robin. (Patch 06)

Patches 01 - 04 are cleanup/refactoring.

It would be also possible to make the change the other way around: always pick
the subchannel based on the current vcpu (and fallback to a round robin in case
there is no subchannel for the current vcpu). Please let me know if you think
it is preferable.

Vitaly Kuznetsov (6):
  Drivers: hv: vmbus: unify calls to percpu_channel_enq()
  Drivers: hv: vmbus: briefly comment num_sc and next_oc
  Drivers: hv: vmbus: decrease num_sc on subchannel removal
  Drivers: hv: vmbus: move init_vp_index() call to vmbus_process_offer()
  Drivers: hv: vmbus: distribute subchannels among all vcpus
  Drivers: hv: vmbus: do a fair round robin when selecting an outgoing
    channel

 drivers/hv/channel_mgmt.c | 248 +++++++++++++++++++++++-----------------------
 include/linux/hyperv.h    |  12 ++-
 2 files changed, 135 insertions(+), 125 deletions(-)

-- 
1.9.3

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