On Thu, Sep 4, 2014 at 10:54 AM, Brian Norris <computersforpe...@gmail.com> wrote: > On Thu, Sep 04, 2014 at 09:14:12AM +0200, Pavel Machek wrote: >> > When CONFIG_PM_DEBUG=y, we provide a sysfs file (/sys/power/pm_test) for >> > selecting one of a few suspend test modes, where rather than entering a >> > full suspend state, the kernel will perform some subset of suspend >> > steps, wait 5 seconds, and then resume back to normal operation. >> > >> > This mode is useful for (among other things) observing the state of the >> > system just before entering a sleep mode, for debugging or analysis >> > purposes. However, a constant 5 second wait is not sufficient for some >> > sorts of analysis; for example, on an SoC, one might want to use >> > external tools to probe the power states of various on-chip controllers >> > or clocks. >> >> When you are doing this kind of analysis, perhaps directly modifying >> kernel source is the way to go ...? > > That's what I've been doing for now, but I have a few engineers who need > to do this sort of testing and aren't kernel developers. I could > continue to maintain my own patch for this, but I just thought I'd see > what others thought. > > Is there a good reason this can't be in mainline? These features are > hidden behind a Kconfig symbol called PM_DEBUG anyway, and I think this > classifies as a pretty simple extension to the limited existing PM > debugging options. >
We're currently carrying a similar patch in the chrome os kernel tree. I would also like to see this go into mainline. -Chirantan > Regards, > Brian > -- > To unsubscribe from this list: send the line "unsubscribe linux-pm" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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/
