2013/1/28 Sedat Dilek <sedat.di...@gmail.com>: > 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?
3.8-rc4-nohz3 is the latest experimental tree that implements full dynticks. It includes an earlier version of full dynticks cputime and many other things to make the full dynticks possible: nohz printk, many tweaks on the scheduler and timers...etc > > Does the latter need no more EXPORT_SYMBOL_GPL for vtime_guest_enter() > and vtime_guest_exit() when CONFIG_KVM=m (see [1])? It doesn't need export symbol on vtime_guest_() APIs, only on guest_enter and guest_exit. Thanks. -- 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/
