On Tue, Feb 09, 2016 at 01:02:09PM +0300, Vladimir Davydov wrote:
> On Mon, Feb 08, 2016 at 11:32:12AM +0300, Cyrill Gorcunov wrote:
> > +static int ve_ts_read(struct cgroup *cg, struct cftype *cft, struct
> > seq_file *m)
> > +{
> > + struct ve_struct *ve = cgroup_ve(cg);
> > + struct timespec ts, *delta;
> > +
> > + do_posix_clock_monotonic_gettime(&ts);
> > + if (cft->private == VE_CF_START_TIMESPEC) {
> > + delta = &ve->start_timespec;
> > + } else if (cft->private == VE_CF_REAL_START_TIMESPEC) {
> > + delta = &ve->real_start_timespec;
> > + monotonic_to_bootbased(&ts);
> > + } else {
> > + delta = &ts;
> > + memset(&ts, 0, sizeof(ts));
> > + WARN_ON_ONCE(1);
> > + }
> > +
> > + set_normalized_timespec(&ts, ts.tv_sec - delta->tv_sec,
> > + ts.tv_nsec - delta->tv_nsec);
> > + seq_printf(m, "%ld %ld", ts.tv_sec, ts.tv_nsec);
> > + return 0;
> > +}
>
> So the output of ve.start_timespec is going to evolve over time, right?
> This looks weird to me. Wouldn't it be better if we returned the
> timespec as is?
>
The idea is that we can read the content of these files and write them back
on the another host to restore "a time namespace".
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