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qemu: process: Setup disk io throttling for -blockdev

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The proper way to do this would be to use the 'throttle' driver but
unfortunately it can't change the 'throttle_group' so we can't provide
feature parity. This hack uses the block_set_io_throttle command to do
so until we can properly replace it.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2018-06-13 17:21:02 +02:00
parent 8e40795dc2
commit 37c21ebec3
1 changed files with 49 additions and 0 deletions
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49
src/qemu/qemu_process.c
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@ -6233,6 +6233,52 @@ qemuProcessGenID(virDomainObjPtr vm,
}
/**
* qemuProcessSetupDiskThrottlingBlockdev:
*
* Sets up disk trottling for -blockdev via block_set_io_throttle monitor
* command. This hack should be replaced by proper use of the 'throttle'
* blockdev driver in qemu once it will support changing of the throttle group.
*/
static int
qemuProcessSetupDiskThrottlingBlockdev(virQEMUDriverPtr driver,
virDomainObjPtr vm,
qemuDomainAsyncJob asyncJob)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
size_t i;
int ret = -1;
if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV))
return 0;
VIR_DEBUG("Setting up disk throttling for -blockdev via block_set_io_throttle");
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
for (i = 0; i < vm->def->ndisks; i++) {
virDomainDiskDefPtr disk = vm->def->disks[i];
qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
if (!qemuDiskConfigBlkdeviotuneEnabled(disk))
continue;
if (qemuMonitorSetBlockIoThrottle(qemuDomainGetMonitor(vm), NULL,
diskPriv->qomName, &disk->blkdeviotune,
true, true, true) < 0)
goto cleanup;
}
ret = 0;
cleanup:
if (qemuDomainObjExitMonitor(driver, vm) < 0)
ret = -1;
return ret;
}
/**
* qemuProcessLaunch:
*
@ -6551,6 +6597,9 @@ qemuProcessLaunch(virConnectPtr conn,
if (qemuProcessSetupBalloon(driver, vm, asyncJob) < 0)
goto cleanup;
if (qemuProcessSetupDiskThrottlingBlockdev(driver, vm, asyncJob) < 0)
goto cleanup;
/* Since CPUs were not started yet, the balloon could not return the memory
* to the host and thus cur_balloon needs to be updated so that GetXMLdesc
* and friends return the correct size in case they can't grab the job */