On Mon, Jan 28, 2013 at 8:04 PM, Frederic Weisbecker <fweis...@gmail.com> wrote: > While remotely reading the cputime of a task running in a > full dynticks CPU, the values stored in utime/stime fields > of struct task_struct may be stale. Its values may be those > of the last kernel <-> user transition time snapshot and > we need to add the tickless time spent since this snapshot. > > To fix this, flush the cputime of the dynticks CPUs on > kernel <-> user transition and record the time / context > where we did this. Then on top of this snapshot and the current > time, perform the fixup on the reader side from task_times() > accessors. > > Signed-off-by: Frederic Weisbecker <fweis...@gmail.com> > Cc: Andrew Morton <a...@linux-foundation.org> > Cc: Ingo Molnar <mi...@kernel.org> > Cc: Li Zhong <zh...@linux.vnet.ibm.com> > Cc: Namhyung Kim <namhyung....@lge.com> > Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> > Cc: Paul Gortmaker <paul.gortma...@windriver.com> > Cc: Peter Zijlstra <pet...@infradead.org> > Cc: Steven Rostedt <rost...@goodmis.org> > Cc: Thomas Gleixner <t...@linutronix.de> > [fixed kvm module related build errors] > Signed-off-by: Sedat Dilek <sedat.di...@gmail.com> >
Can you explain a bit what is the difference between "3.8-rc4-nohz3" and "full-dynticks-cputime-for-mingo" patchsets? Does the latter need no more EXPORT_SYMBOL_GPL for vtime_guest_enter() and vtime_guest_exit() when CONFIG_KVM=m (see [1])? - Sedat - [1] https://lkml.org/lkml/2013/1/23/473 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
