[zz]libvirt - Progress monitoring & cancellation of jobs

最新推荐文章于 2022-11-16 00:10:41 发布

转载最新推荐文章于 2022-11-16 00:10:41 发布 · 125 阅读

本文介绍了一系列新API，允许用户监控并取消长时间运行的任务，适用于virDomainMigrate、virDomainSave等操作。具体实现了QEMU的API，但其他支持的API可以自定义实现。使用这些API需要多线程或多连接，因为主要API调用仍然完全阻塞。通过virsh命令可以查看任务状态，如保存、迁移和核心转储。新API还引入了virDomainAbortJob()方法，用于在另一个线程中终止正在进行的任务。该方法在QEMU中不支持监控传入迁移，因此无法完成virDomainRestore的配置。此外，新的virDomainJobInfo()方法提供了查询状态的功能，包括剩余数据和内存使用情况。

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This series introduces 2 new APIs to allow long running jobs to
be monitored and cancelled. This applies to virDomainMigrate,
virDomainSave, virDomainRestore and virDomainCoreDump at least.
The implementation is provided for QEMU only, any others that
are able to implementation can do so as desired.

Usefulness of these new APIs requires use of multiple threads on
a single connection, or multiple connections, since the main
API calls are still all fully blocking. Instead a parallel thread
or process can monitor. This can be seen with virsh

In termainl 1

 $ virsh save demo demo.img

In terminal 2

 $ ./virsh domjobinfo demo
  Job type:         Unbounded   
  Time elapsed:     795          ms
  Data processed:   22446080     bytes
  Data remaining:   219119616    bytes
  Data total:       241565696    bytes
  Memory processed: 22446080     bytes
  Memory remaining: 219119616    bytes
  Memory total:     241565696    bytes

 $ ./virsh domjobinfo demo
  Job type:         Unbounded   
  Time elapsed:     1669         ms
  Data processed:   139784192    bytes
  Data remaining:   101781504    bytes
  Data total:       241565696    bytes
  Memory processed: 139784192    bytes
  Memory remaining: 101781504    bytes
  Memory total:     241565696    bytes

 $ ./virsh domjobabort demo


Back in terminal 1

  error: Failed to save domain demo to demo.img
  error: operation failed: Migration was cancelled by client

Daniel P. Berrange — 2010年02月05日星期五 01时25分07秒

The new virDomainAbortJob() method provides a way for a second
thread to abort an ongoing job run by another thread. This
extends to any API with  which the virDomainGetJobInfo() API
is intended to work. Cancellation is not guarenteed, rather best
effort on part of the hypervisor and not required to be implmented.

* include/libvirt/libvirt.h.in: Define virDomainAbortJob()
---
 include/libvirt/libvirt.h.in |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 5058bc0..0ffcf11 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -1804,6 +1804,8 @@ struct _virDomainJobInfo {
 int virDomainGetJobInfo(virDomainPtr dom,
                         virDomainJobInfoPtr info);+int virDomainAbortJob(virDomainPtr dom);
+
 #ifdef __cplusplus
 }
 #endif

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Daniel P. Berrange — 2010年02月05日星期五 01时25分09秒

Introduce support for  virDomainGetJobInfo in the QEMU driver. This
allows for monitoring of any API that uses the 'info migrate' monitor
command. ie virDomainMigrate, virDomainSave and virDomainCoreDump

Unfortunately QEMU does not provide a way to monitor incoming migration
so we can't wire up virDomainRestore yet.

The virsh tool gets a new command 'domjobinfo' to query status