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| author | Stephen Hemminger <stephen@networkplumber.org> | 2017-06-25 12:30:29 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-17 17:16:05 +0200 |
| commit | 15e1674de747d58c5a6154ba6e85bc61e5009b08 (patch) | |
| tree | 31ac562fa3b16908a069a5657d386957e782c7fb /drivers/hv | |
| parent | 03bad714a1619c0074eb44d6f217c505fe27030f (diff) | |
| download | linux-stable-15e1674de747d58c5a6154ba6e85bc61e5009b08.tar.gz linux-stable-15e1674de747d58c5a6154ba6e85bc61e5009b08.tar.bz2 linux-stable-15e1674de747d58c5a6154ba6e85bc61e5009b08.zip | |
vmbus: add prefetch to ring buffer iterator
When iterating over incoming ring elements from the host, prefetch
the next descriptor so that it is cache hot.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/ring_buffer.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 741daa6e2fc7..12eb8caa4263 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -357,11 +357,16 @@ static u32 hv_pkt_iter_avail(const struct hv_ring_buffer_info *rbi) struct vmpacket_descriptor *hv_pkt_iter_first(struct vmbus_channel *channel) { struct hv_ring_buffer_info *rbi = &channel->inbound; + struct vmpacket_descriptor *desc; if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor)) return NULL; - return hv_get_ring_buffer(rbi) + rbi->priv_read_index; + desc = hv_get_ring_buffer(rbi) + rbi->priv_read_index; + if (desc) + prefetch((char *)desc + (desc->len8 << 3)); + + return desc; } EXPORT_SYMBOL_GPL(hv_pkt_iter_first); |