On 01/20/2014 07:12 PM, Thorsten Behrens wrote:
> And provide domain summary stat in that case, for lxc backend.
> Use case is a container inheriting all devices from the host,
> e.g. when doing application containerization.
> ---
>
> Notes on v2:
> - adapted virDomainBlockStats docs
> - adapted virsh domblkstat docs
> - made virsh actually accept empty disk argument
> - pedaling back a bit on the API change - accepting a NULL ptr
> for the disk arg would need changing the remote protocol, so
> better just take the empty string. Makes this less invasive even.
>
> src/libvirt.c | 8 ++++++--
> src/lxc/lxc_driver.c | 10 ++++++++++
> tools/virsh-domain-monitor.c | 11 ++++++++---
> tools/virsh.pod | 5 +++--
> 4 files changed, 27 insertions(+), 7 deletions(-)
>
> diff --git a/src/libvirt.c b/src/libvirt.c
> index 87a4d46..ead0813 100644
> --- a/src/libvirt.c
> +++ b/src/libvirt.c
> @@ -7781,7 +7781,9 @@ error:
> * an unambiguous source name of the block device (the <source
> * file='...'/> sub-element, such as "/path/to/image"). Valid names
> * can be found by calling virDomainGetXMLDesc() and inspecting
> - * elements within //domain/devices/disk.
> + * elements within //domain/devices/disk. Some drivers might also
> + * accept the empty string for the @disk parameter, and then yield
> + * summary stats for the entire domain.
> *
> * Domains may have more than one block device. To get stats for
> * each you should make multiple calls to this function.
> @@ -7847,7 +7849,9 @@ error:
> * an unambiguous source name of the block device (the <source
> * file='...'/> sub-element, such as "/path/to/image"). Valid names
> * can be found by calling virDomainGetXMLDesc() and inspecting
> - * elements within //domain/devices/disk.
> + * elements within //domain/devices/disk. Some drivers might also
> + * accept the empty string for the @disk parameter, and then yield
> + * summary stats for the entire domain.
> *
> * Domains may have more than one block device. To get stats for
> * each you should make multiple calls to this function.
> diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
> index bf6fd5c..31f1625 100644
> --- a/src/lxc/lxc_driver.c
> +++ b/src/lxc/lxc_driver.c
> @@ -2046,6 +2046,16 @@ lxcDomainBlockStats(virDomainPtr dom,
> goto cleanup;
> }
>
> + if (!*path) {
> + /* empty path - return entire domain blkstats instead */
> + ret = virCgroupGetBlkioIoServiced(priv->cgroup,
> + &stats->rd_bytes,
> + &stats->wr_bytes,
> + &stats->rd_req,
> + &stats->wr_req);
> + goto cleanup;
> + }
> +
> if ((idx = virDomainDiskIndexByName(vm->def, path, false)) < 0) {
> virReportError(VIR_ERR_INVALID_ARG,
> _("invalid path: %s"), path);
> diff --git a/tools/virsh-domain-monitor.c b/tools/virsh-domain-monitor.c
> index b29b82a..6be253f 100644
> --- a/tools/virsh-domain-monitor.c
> +++ b/tools/virsh-domain-monitor.c
> @@ -880,7 +880,7 @@ static const vshCmdOptDef opts_domblkstat[] = {
> },
> {.name = "device",
> .type = VSH_OT_DATA,
> - .flags = VSH_OFLAG_REQ,
> + .flags = VSH_OFLAG_EMPTY_OK,
> .help = N_("block device")
> },
> {.name = "human",
> @@ -946,8 +946,13 @@ cmdDomblkstat(vshControl *ctl, const vshCmd *cmd)
> if (!(dom = vshCommandOptDomain(ctl, cmd, &name)))
> return false;
>
> - if (vshCommandOptStringReq(ctl, cmd, "device", &device) < 0)
> - goto cleanup;
> + /* device argument is optional now. if it's missing, supply empty
> + string to denote 'all devices'. A NULL device arg would violate
> + API contract.
> + */
> + rc = vshCommandOptStringReq(ctl, cmd, "device", &device); /* and ignore rc */
> + if (!device)
> + device = "";
>
> rc = virDomainBlockStatsFlags(dom, device, NULL, &nparams, 0);
>
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index 3534b54..c3ca016 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -616,12 +616,13 @@ If I<--graceful> is specified, don't resort to extreme measures
> (e.g. SIGKILL) when the guest doesn't stop after a reasonable timeout;
> return an error instead.
>
> -=item B<domblkstat> I<domain> I<block-device> [I<--human>]
> +=item B<domblkstat> I<domain> [I<block-device>] [I<--human>]
>
> Get device block stats for a running domain. A I<block-device> corresponds
> to a unique target name (<target dev='name'/>) or source file (<source
> file='name'/>) for one of the disk devices attached to I<domain> (see
> -also B<domblklist> for listing these names).
> +also B<domblklist> for listing these names). On a lxc domain, omitting the
> +I<block-device> yields device block stats summarily for the entire domain.
>
> Use I<--human> for a more human readable output.
>
>
Looks good to me
ACK
thanks!
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