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author | Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> | 2011-11-03 16:57:25 +0800 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2011-12-05 14:51:35 +0100 |
commit | 0563e191516289c9d2f282a8c50f2eecef2fa773 (patch) | |
tree | ede6d148a62baf0b2cb2fc067403a48464f2cc91 /blockdev.c | |
parent | 3535a9c6bef5234ab4df3f143763a0e89a1ad29c (diff) | |
download | qemu-0563e191516289c9d2f282a8c50f2eecef2fa773.zip qemu-0563e191516289c9d2f282a8c50f2eecef2fa773.tar.gz qemu-0563e191516289c9d2f282a8c50f2eecef2fa773.tar.bz2 |
block: add the blockio limits command line support
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'blockdev.c')
-rw-r--r-- | blockdev.c | 44 |
1 files changed, 44 insertions, 0 deletions
@@ -216,6 +216,26 @@ static int parse_block_error_action(const char *buf, int is_read) } } +static bool do_check_io_limits(BlockIOLimit *io_limits) +{ + bool bps_flag; + bool iops_flag; + + assert(io_limits); + + bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) + && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) + || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); + iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) + && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) + || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); + if (bps_flag || iops_flag) { + return false; + } + + return true; +} + DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) { const char *buf; @@ -235,6 +255,7 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) int on_read_error, on_write_error; const char *devaddr; DriveInfo *dinfo; + BlockIOLimit io_limits; int snapshot = 0; int ret; @@ -353,6 +374,26 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) } } + /* disk I/O throttling */ + io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = + qemu_opt_get_number(opts, "bps", 0); + io_limits.bps[BLOCK_IO_LIMIT_READ] = + qemu_opt_get_number(opts, "bps_rd", 0); + io_limits.bps[BLOCK_IO_LIMIT_WRITE] = + qemu_opt_get_number(opts, "bps_wr", 0); + io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = + qemu_opt_get_number(opts, "iops", 0); + io_limits.iops[BLOCK_IO_LIMIT_READ] = + qemu_opt_get_number(opts, "iops_rd", 0); + io_limits.iops[BLOCK_IO_LIMIT_WRITE] = + qemu_opt_get_number(opts, "iops_wr", 0); + + if (!do_check_io_limits(&io_limits)) { + error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " + "cannot be used at the same time"); + return NULL; + } + on_write_error = BLOCK_ERR_STOP_ENOSPC; if ((buf = qemu_opt_get(opts, "werror")) != NULL) { if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { @@ -460,6 +501,9 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); + /* disk I/O throttling */ + bdrv_set_io_limits(dinfo->bdrv, &io_limits); + switch(type) { case IF_IDE: case IF_SCSI: |