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1. UNIX for Beginners Questions & Answers
Hi All,
Is there any way I can prioritize my VMs when there is resource crunch in host machine so that some VMs will be allocated more vcpu, more memory than other VMs in kvm/qemu hypervisor based virtual machines?
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Hi,
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5. Linux
:eek:
Hi guys,
I'm pulling my hair out over this one. I am trying to set up a virtual server environment. ( I am using VirtualBox, but I think this is irrelevant to this problem.) I have downloaded a pre-packaged Linux virtual disk, with which I have successfully started a virtual instance of a... (4 Replies)
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KVM(3) BSD Library Functions Manual KVM(3)
NAME
kvm -- kernel memory interface
LIBRARY
Kernel Data Access Library (libkvm, -lkvm)
DESCRIPTION
The kvm library provides a uniform interface for accessing kernel virtual memory images, including live systems and crash dumps. Access to
live systems is via sysctl(3) for some functions, and mem(4) and kmem(4) for other functions, while crash dumps can be examined via the core
file generated by savecore(8). The interface behaves similarly in both cases. Memory can be read and written, kernel symbol addresses can
be looked up efficiently, and information about user processes can be gathered.
The kvm_open() function is first called to obtain a descriptor for all subsequent calls.
COMPATIBILITY
The kvm interface was first introduced in SunOS. A considerable number of programs have been developed that use this interface, making back-
ward compatibility highly desirable. In most respects, the Sun kvm interface is consistent and clean. Accordingly, the generic portion of
the interface (i.e., kvm_open(), kvm_close(), kvm_read(), kvm_write(), and kvm_nlist()) has been incorporated into the BSD interface.
Indeed, many kvm applications (i.e., debuggers and statistical monitors) use only this subset of the interface.
The process interface was not kept. This is not a portability issue since any code that manipulates processes is inherently machine depen-
dent.
Finally, the Sun kvm error reporting semantics are poorly defined. The library can be configured either to print errors to stderr automati-
cally, or to print no error messages at all. In the latter case, the nature of the error cannot be determined. To overcome this, the BSD
interface includes a routine, kvm_geterr(3), to return (not print out) the error message corresponding to the most recent error condition on
the given descriptor.
SEE ALSO
kvm_close(3), kvm_getargv(3), kvm_getenvv(3), kvm_geterr(3), kvm_getfiles(3), kvm_getloadavg(3), kvm_getprocs(3), kvm_getswapinfo(3),
kvm_nlist(3), kvm_open(3), kvm_openfiles(3), kvm_read(3), kvm_write(3), sysctl(3), kmem(4), mem(4)
BSD
April 25, 2010 BSD
