[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] stubdom: optimize block io completion polling
stubdom: optimize block io completion polling by not polling all the time but just when some requests have completed. Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> diff -r c9122280dd86 extras/mini-os/blkfront.c --- a/extras/mini-os/blkfront.c Wed Feb 13 12:13:42 2008 +0000 +++ b/extras/mini-os/blkfront.c Wed Feb 13 13:56:48 2008 +0000 @@ -370,6 +370,10 @@ moretodo: RING_FINAL_CHECK_FOR_RESPONSES(&dev->ring, more); if (more) goto moretodo; +#ifdef HAVE_LIBC + if (!nr_consumed) + files[dev->fd].read = 0; +#endif return nr_consumed; } diff -r c9122280dd86 tools/ioemu/block-vbd.c --- a/tools/ioemu/block-vbd.c Wed Feb 13 12:13:42 2008 +0000 +++ b/tools/ioemu/block-vbd.c Wed Feb 13 13:56:48 2008 +0000 @@ -67,6 +67,12 @@ static int vbd_probe(const uint8_t *buf, return 100; } +static void vbd_io_completed(void *opaque) +{ + BDRVVbdState *s = opaque; + blkfront_aio_poll(s->dev); +} + static int vbd_open(BlockDriverState *bs, const char *filename, int flags) { BDRVVbdState *s = bs->opaque; @@ -85,6 +91,7 @@ static int vbd_open(BlockDriverState *bs } s->fd = blkfront_open(s->dev); + qemu_set_fd_handler(s->fd, vbd_io_completed, NULL, s); QEMU_LIST_INSERT_HEAD(&vbds, s, list); @@ -102,9 +109,6 @@ void qemu_aio_init(void) void qemu_aio_poll(void) { - BDRVVbdState *s; - for (s = vbds.lh_first; s; s = s->list.le_next) - blkfront_aio_poll(s->dev); } /* Wait for all IO requests to complete. */ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |