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| author | Fam Zheng <famz@redhat.com> | 2017-02-09 16:40:47 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-02-17 21:52:30 +0200 |
| commit | 0793169870f376bc9959b7d81df48ab4a90dcceb (patch) | |
| tree | 706cd7d990534f97bcf1dd9ca8ca09c4e7d350ff /docs/nvdimm.txt | |
| parent | 4bb571d857d973d9308d9fdb1f48d983d6639bd4 (diff) | |
| download | qemu-0793169870f376bc9959b7d81df48ab4a90dcceb.zip qemu-0793169870f376bc9959b7d81df48ab4a90dcceb.tar.gz qemu-0793169870f376bc9959b7d81df48ab4a90dcceb.tar.bz2 | |
virtio: Report real progress in VQ aio poll handler
In virtio_queue_host_notifier_aio_poll, not all "!virtio_queue_empty()"
cases are making true progress.
Currently the offending one is virtio-scsi event queue, whose handler
does nothing if no event is pending. As a result aio_poll() will spin on
the "non-empty" VQ and take 100% host CPU.
Fix this by reporting actual progress from virtio queue aio handlers.
Reported-by: Ed Swierk <eswierk@skyportsystems.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Tested-by: Ed Swierk <eswierk@skyportsystems.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'docs/nvdimm.txt')
0 files changed, 0 insertions, 0 deletions