Messages in this thread | | | Date | Tue, 16 Mar 2010 18:07:11 -0500 | From | Anthony Liguori <> | Subject | Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side |
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On 03/16/2010 12:39 PM, Ingo Molnar wrote: >> If we look at the use-case, it's going to be something like, a user is >> creating virtual machines and wants to get performance information about >> them. >> >> Having to run a separate tool like perf is not going to be what they would >> expect they had to do. Instead, they would either use their existing GUI >> tool (like virt-manager) or they would use their management interface >> (either QMP or libvirt). >> >> The complexity of interaction is due to the fact that perf shouldn't be a >> stand alone tool. It should be a library or something with a programmatic >> interface that another tool can make use of. >> > But ... a GUI interface/integration is of course possible too, and it's being > worked on. > > perf is mainly a kernel developer tool, and kernel developers generally dont > use GUIs to do their stuff: which is the (sole) reason why its first ~850 > commits of tools/perf/ were done without a GUI. We go where our developers > are. > > In any case it's not an excuse to have no proper command-line tooling. In fact > if you cannot get simpler, more atomic command-line tooling right then you'll > probably doubly suck at doing a GUI as well. >
It's about who owns the user interface.
If qemu owns the user interface, than we can satisfy this in a very simple way by adding a perf monitor command. If we have to support third party tools, then it significantly complicates things.
Regards,
Anthony Liguori
> Ingo >
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