diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 39 |
1 files changed, 39 insertions, 0 deletions
@@ -30,6 +30,7 @@ #include "qjson.h" #include "qemu-coroutine.h" #include "qmp-commands.h" +#include "qemu-timer.h" #ifdef CONFIG_BSD #include <sys/types.h> @@ -105,6 +106,36 @@ int is_windows_drive(const char *filename) } #endif +/* throttling disk I/O limits */ +static void bdrv_block_timer(void *opaque) +{ + BlockDriverState *bs = opaque; + + qemu_co_queue_next(&bs->throttled_reqs); +} + +void bdrv_io_limits_enable(BlockDriverState *bs) +{ + qemu_co_queue_init(&bs->throttled_reqs); + bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); + bs->slice_time = 5 * BLOCK_IO_SLICE_TIME; + bs->slice_start = qemu_get_clock_ns(vm_clock); + bs->slice_end = bs->slice_start + bs->slice_time; + memset(&bs->io_base, 0, sizeof(bs->io_base)); + bs->io_limits_enabled = true; +} + +bool bdrv_io_limits_enabled(BlockDriverState *bs) +{ + BlockIOLimit *io_limits = &bs->io_limits; + return io_limits->bps[BLOCK_IO_LIMIT_READ] + || io_limits->bps[BLOCK_IO_LIMIT_WRITE] + || io_limits->bps[BLOCK_IO_LIMIT_TOTAL] + || io_limits->iops[BLOCK_IO_LIMIT_READ] + || io_limits->iops[BLOCK_IO_LIMIT_WRITE] + || io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; +} + /* check if the path starts with "<protocol>:" */ static int path_has_protocol(const char *path) { @@ -1526,6 +1557,14 @@ void bdrv_get_geometry_hint(BlockDriverState *bs, *psecs = bs->secs; } +/* throttling disk io limits */ +void bdrv_set_io_limits(BlockDriverState *bs, + BlockIOLimit *io_limits) +{ + bs->io_limits = *io_limits; + bs->io_limits_enabled = bdrv_io_limits_enabled(bs); +} + /* Recognize floppy formats */ typedef struct FDFormat { FDriveType drive; |