The patch introduce one new command block_set_io_throttle; For its usage syntax, if you have better idea, pls let me know.
Signed-off-by: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
---
blockdev.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
blockdev.h | 2 +
hmp-commands.hx | 15 ++++++++++++
qerror.c | 4 +++
qerror.h | 3 ++
qmp-commands.hx | 52 ++++++++++++++++++++++++++++++++++++++++-
6 files changed, 144 insertions(+), 1 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 9c78548..ddf7af9 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -782,6 +782,75 @@ int do_change_block(Monitor *mon, const char *device,
return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);
}
+/* throttling disk I/O limits */
+int do_block_set_io_throttle(Monitor *mon,
+ const QDict *qdict, QObject **ret_data)
+{
+ const char *devname = qdict_get_str(qdict, "device");
+ uint64_t bps = qdict_get_try_int(qdict, "bps", -1);
+ uint64_t bps_rd = qdict_get_try_int(qdict, "bps_rd", -1);
+ uint64_t bps_wr = qdict_get_try_int(qdict, "bps_wr", -1);
+ uint64_t iops = qdict_get_try_int(qdict, "iops", -1);
+ uint64_t iops_rd = qdict_get_try_int(qdict, "iops_rd", -1);
+ uint64_t iops_wr = qdict_get_try_int(qdict, "iops_wr", -1);
+ BlockDriverState *bs;
+
+ bs = bdrv_find(devname);
+ if (!bs) {
+ qerror_report(QERR_DEVICE_NOT_FOUND, devname);
+ return -1;
+ }
+
+ if ((bps == -1) && (bps_rd == -1) && (bps_wr == -1)
+ && (iops == -1) && (iops_rd == -1) && (iops_wr == -1)) {
+ qerror_report(QERR_MISSING_PARAMETER,
+ "bps/bps_rd/bps_wr/iops/iops_rd/iops_wr");
+ return -1;
+ }
+
+ if (((bps != -1) && ((bps_rd != -1) || (bps_wr != -1)))
+ || ((iops != -1) && ((iops_rd != -1) || (iops_wr != -1)))) {
+ qerror_report(QERR_INVALID_PARAMETER_COMBINATION);
+ return -1;
+ }
+
+ if (bps != -1) {
+ bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps;
+ bs->io_limits.bps[BLOCK_IO_LIMIT_READ] = 0;
+ bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE] = 0;
+ }
+
+ if ((bps_rd != -1) || (bps_wr != -1)) {
+ bs->io_limits.bps[BLOCK_IO_LIMIT_READ] =
+ (bps_rd == -1) ? bs->io_limits.bps[BLOCK_IO_LIMIT_READ] : bps_rd;
+ bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE] =
+ (bps_wr == -1) ? bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE] : bps_wr;
+ bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = 0;
+ }
+
+ if (iops != -1) {
+ bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = iops;
+ bs->io_limits.iops[BLOCK_IO_LIMIT_READ] = 0;
+ bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE] = 0;
+ }
+
+ if ((iops_rd != -1) || (iops_wr != -1)) {
+ bs->io_limits.iops[BLOCK_IO_LIMIT_READ] =
+ (iops_rd == -1) ? bs->io_limits.iops[BLOCK_IO_LIMIT_READ] : iops_rd;
+ bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE] =
+ (iops_wr == -1) ? bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE] : iops_wr;
+ bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = 0;
+ }
+
+ if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) {
+ bdrv_io_limits_enable(bs);
+ } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) {
+ bdrv_io_limits_disable(bs);
+ }
+
+ return 0;
+}
+
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
const char *id = qdict_get_str(qdict, "id");
diff --git a/blockdev.h b/blockdev.h
index 0a5144c..d0d0d77 100644
--- a/blockdev.h
+++ b/blockdev.h
@@ -63,6 +63,8 @@ int do_block_set_passwd(Monitor *mon, const QDict *qdict, QObject **ret_data);
int do_change_block(Monitor *mon, const char *device,
const char *filename, const char *fmt);
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
+int do_block_set_io_throttle(Monitor *mon,
+ const QDict *qdict, QObject **ret_data);
int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data);
int do_block_resize(Monitor *mon, const QDict *qdict, QObject **ret_data);
diff --git a/hmp-commands.hx b/hmp-commands.hx
index aceba74..3ca496d 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1210,6 +1210,21 @@ ETEXI
},
STEXI
+@item block_set_io_throttle @var{device} @var{bps} @var{bps_rd} @var{bps_wr} @var{iops} @var{iops_rd} @var{iops_wr}
+@findex block_set_io_throttle
+Change I/O throttle limits for a block drive to @var{bps} @var{bps_rd} @var{bps_wr} @var{iops} @var{iops_rd} @var{iops_wr}
+ETEXI
+
+ {
+ .name = "block_set_io_throttle",
+ .args_type = "device:B,bps:i?,bps_rd:i?,bps_wr:i?,iops:i?,iops_rd:i?,iops_wr:i?",
+ .params = "device [bps] [bps_rd] [bps_wr] [iops] [iops_rd] [iops_wr]",
+ .help = "change I/O throttle limts for a block drive",
+ .user_print = monitor_user_noop,
+ .mhandler.cmd_new = do_block_set_io_throttle,
+ },
+
+STEXI
@item block_passwd @var{device} @var{password}
@findex block_passwd
Set the encrypted device @var{device} password to @var{password}
diff --git a/qerror.c b/qerror.c
index d7fcd93..3a21560 100644
--- a/qerror.c
+++ b/qerror.c
@@ -213,6 +213,10 @@ static const QErrorStringTable qerror_table[] = {
.error_fmt = QERR_VNC_SERVER_FAILED,
.desc = "Could not start VNC server on %(target)",
},
+ {
+ .error_fmt = QERR_INVALID_PARAMETER_COMBINATION,
+ .desc = "Invalid paramter combination",
+ },
{}
};
diff --git a/qerror.h b/qerror.h
index 16c830d..81cfe79 100644
--- a/qerror.h
+++ b/qerror.h
@@ -181,4 +181,7 @@ QError *qobject_to_qerror(const QObject *obj);
#define QERR_FEATURE_DISABLED \
"{ 'class': 'FeatureDisabled', 'data': { 'name': %s } }"
+#define QERR_INVALID_PARAMETER_COMBINATION \
+ "{ 'class': 'InvalidParameterCombination', 'data': {} }"
+
#endif /* QERROR_H */
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 92c5c3a..9b594cd 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -828,6 +828,44 @@ Example:
EQMP
{
+ .name = "block_set_io_throttle",
+ .args_type = "device:B,bps:i?,bps_rd:i?,bps_wr:i?,iops:i?,iops_rd:i?,iops_wr:i?",
+ .params = "device [bps] [bps_rd] [bps_wr] [iops] [iops_rd] [iops_wr]",
+ .help = "change I/O throttle limts for a block drive",
+ .user_print = monitor_user_noop,
+ .mhandler.cmd_new = do_block_set_io_throttle,
+ },
+
+SQMP
+block_set_io_throttle
+------------
+
+Change I/O throttle limits for a block drive.
+
+Arguments:
+
+- "device": device name (json-string)
+- "bps": total throughput limit in bytes per second(json-int, optional)
+- "bps_rd": read throughput limit in bytes per second(json-int, optional)
+- "bps_wr": read throughput limit in bytes per second(json-int, optional)
+- "iops": total I/O operations per second(json-int, optional)
+- "iops_rd": read I/O operations per second(json-int, optional)
+- "iops_wr": write I/O operations per second(json-int, optional)
+
+Example:
+
+-> { "execute": "block_set_io_throttle", "arguments": { "device": "virtio0",
+ "bps": "1000000",
+ "bps_rd": "0",
+ "bps_wr": "0",
+ "iops": "0",
+ "iops_rd": "0",
+ "iops_wr": "0" } }
+<- { "return": {} }
+
+EQMP
+
+ {
.name = "set_password",
.args_type = "protocol:s,password:s,connected:s?",
.params = "protocol password action-if-connected",
@@ -1082,6 +1120,12 @@ Each json-object contain the following:
"tftp", "vdi", "vmdk", "vpc", "vvfat"
- "backing_file": backing file name (json-string, optional)
- "encrypted": true if encrypted, false otherwise (json-bool)
+ - "bps": limit total bytes per second (json-int)
+ - "bps_rd": limit read bytes per second (json-int)
+ - "bps_wr": limit write bytes per second (json-int)
+ - "iops": limit total I/O operations per second (json-int)
+ - "iops_rd": limit read operations per second (json-int)
+ - "iops_wr": limit write operations per second (json-int)
Example:
@@ -1096,7 +1140,13 @@ Example:
"ro":false,
"drv":"qcow2",
"encrypted":false,
- "file":"disks/test.img"
+ "file":"disks/test.img",
+ "bps":1000000,
+ "bps_rd":0,
+ "bps_wr":0,
+ "iops":1000000,
+ "iops_rd":0,
+ "iops_wr":0,
},
"type":"unknown"
},
--
1.7.2.3
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