Juergen Gross writes ("[PATCH v4 1/3] libxc: do some retries in
xc_cpupool_removecpu() for EBUSY case"):
> The hypervisor might return EBUSY when trying to remove a cpu from a
> cpupool when a domain running in this cpupool has pinned a vcpu
> temporarily. Do some retries in this case, perhaps the situation
> cleans up.
Unfortunately this patch is not acceptable because:
> + for ( retries = 0; retries < NUM_RMCPU_BUSY_RETRIES; retries++ ) {
> + err = do_sysctl_save(xch, &sysctl);
> + if ( err < 0 && errno == EBUSY )
> + sleep(1);
libxc may be called from within long-running daemons such as libvirt.
In such a system this sleep would enable an uncooperative or buggy
guest to block all toolstack operations for an extended period.
Sorry,
Ian.
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