[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] export cpu idle time to guests
The attached patch exports cpu idle time to guests. This is one of the things necessary for cpu frequency scaling to work well. It works, but has the problem that the sysctl hypercall is really only designed to be used from userspace, so we would need a userspace cpufreq daemon running in dom0. Mark, does this look reasonable to you? Signed-off-by: Rik van Riel <riel@xxxxxxxxxx> -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. diff -r 93f77a5a8437 xen/common/sysctl.c --- a/xen/common/sysctl.c Sun Jun 10 19:58:22 2007 +0100 +++ b/xen/common/sysctl.c Wed Jun 13 15:42:24 2007 -0400 @@ -136,6 +136,33 @@ long do_sysctl(XEN_GUEST_HANDLE(xen_sysc } break; + case XEN_SYSCTL_getidletime: + { + uint32_t cpu; + uint32_t max_cpus = op->u.getidletime.max_cpus; + uint64_t idletime; + + for_each_online_cpu (cpu) { + if ( cpu >= max_cpus ) + break; + + idletime = idle_vcpu[cpu]->runstate.time[RUNSTATE_running]; + + if ( copy_to_guest_offset(op->u.getidletime.buffer, cpu, + &idletime, 1) ) { + ret = -EFAULT; + break; + } + } + + op->u.getidletime.num_cpus = cpu; + + if ( copy_to_guest(u_sysctl, op, 1) ) + ret = -EFAULT; + } + break; + + default: ret = arch_do_sysctl(op, u_sysctl); break; diff -r 93f77a5a8437 xen/include/public/sysctl.h --- a/xen/include/public/sysctl.h Sun Jun 10 19:58:22 2007 +0100 +++ b/xen/include/public/sysctl.h Wed Jun 13 15:41:58 2007 -0400 @@ -152,6 +152,17 @@ typedef struct xen_sysctl_debug_keys xen typedef struct xen_sysctl_debug_keys xen_sysctl_debug_keys_t; DEFINE_XEN_GUEST_HANDLE(xen_sysctl_debug_keys_t); +#define XEN_SYSCTL_getidletime 8 +struct xen_sysctl_getidletime { + /* IN variables. */ + uint32_t max_cpus; + XEN_GUEST_HANDLE(uint64_t) buffer; + /* OUT variables. */ + uint32_t num_cpus; +}; +typedef struct xen_sysctl_getidletime xen_sysctl_getidletime_t; +DEFINE_XEN_GUEST_HANDLE(xen_sysctl_getidletime_t); + struct xen_sysctl { uint32_t cmd; uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */ @@ -163,6 +174,7 @@ struct xen_sysctl { struct xen_sysctl_perfc_op perfc_op; struct xen_sysctl_getdomaininfolist getdomaininfolist; struct xen_sysctl_debug_keys debug_keys; + struct xen_sysctl_getidletime getidletime; uint8_t pad[128]; } u; }; _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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