linux-kernel - [PATCH V3 0/6] vhost code cleanup and minor enhancement

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Message-Id: <1378111261-14826-1-git-send-email-jasowang@redhat.com>
Date:	Mon,  2 Sep 2013 16:40:55 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	mst@...hat.com, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Jason Wang <jasowang@...hat.com>
Subject: [PATCH V3 0/6] vhost code cleanup and minor enhancement

This series tries to unify and simplify vhost codes especially for
zerocopy. With this series, 5% - 10% improvement for per cpu throughput were
seen during netperf guest sending test.

Plase review.

Changes from V2:
- Typo fixes and code style fix
- Add performance gain in the commit log of patch 2/6
- Retest the update the result in patch 6/6

Changes from V1:
- Fix the zerocopy enabling check by changing the check of upend_idx != done_idx
  to (upend_idx + 1) % UIO_MAXIOV == done_idx.
- Switch to use put_user() in __vhost_add_used_n() if there's only one used
- Keep the max pending check based on Michael's suggestion.

Jason Wang (6):
  vhost_net: make vhost_zerocopy_signal_used() return void
  vhost_net: use vhost_add_used_and_signal_n() in
    vhost_zerocopy_signal_used()
  vhost: switch to use vhost_add_used_n()
  vhost_net: determine whether or not to use zerocopy at one time
  vhost_net: poll vhost queue after marking DMA is done
  vhost_net: correctly limit the max pending buffers

 drivers/vhost/net.c   |   92 ++++++++++++++++++++++--------------------------
 drivers/vhost/vhost.c |   54 ++++++----------------------
 2 files changed, 54 insertions(+), 92 deletions(-)

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