Commit Graph

8 Commits

Author SHA1 Message Date
Thomas Gleixner
7a338472f2 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
Based on 1 normalized pattern(s):

  this work is licensed under the terms of the gnu gpl version 2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 48 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Enrico Weigelt <info@metux.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081204.624030236@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:52 +02:00
Michael S. Tsirkin
a49795054a ringtest: support test specific parameters
Add a new flag for passing test-specific parameters.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2017-05-09 16:43:23 +03:00
Dan Carpenter
4f6d9bfc88 ringtest: fix an assert statement
There is an || vs && typo so the assert can never be triggered.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
2017-05-02 23:41:42 +03:00
Paolo Bonzini
948a8ac296 ringtest: poll for new buffers once before updating event index
Updating the event index has a memory barrier and causes more work
on the other side to actually signal the event.  It is unnecessary
if a new buffer has already appeared on the ring, so poll once before
doing the update.

The effect of this on the 0.9 ring implementation is pretty much
invisible, but on the new-style ring it provides a consistent 3%
performance improvement.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-10-31 00:21:43 +02:00
Paolo Bonzini
d3c3589b8b ringtest: commonize implementation of poll_avail/poll_used
Provide new primitives used_empty/avail_empty and
build poll_avail/poll_used on top of it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-10-31 00:21:43 +02:00
Paolo Bonzini
44d65ea161 ringtest: use link-time optimization
By using -flto and -fwhole-program, all functions from the ring implementation
can be treated as static and possibly inlined.  Force this to happen through
the GCC flatten attribute.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-10-31 00:21:42 +02:00
Michael S. Tsirkin
bb99128872 ringtest: pass buf != NULL
just a stub pointer for now.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-05-22 19:44:14 +03:00
Michael S. Tsirkin
481eaec37e tools/virtio: add ringtest utilities
This adds micro-benchmarks useful for tuning virtio ring layouts.
Three layouts are currently implemented:

- virtio 0.9 compatible one
- an experimental extension bypassing the ring index, polling ring
  itself instead
- an experimental extension bypassing avail and used ring completely

Typical use:

sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring

It doesn't depend on the kernel directly, but it's handy
to have as much virtio stuff as possible in one tree.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-01-26 10:18:30 +02:00