Hi Deepthi, > Texas Instruments France SA, 821 Avenue Jack Kilby, 06270 Villeneuve Loubet. 036 420 040 R.C.S Antibes. Capital de EUR 753.920 -----Original Message----- > From: Deepthi Dharwar [mailto:deepthi@xxxxxxxxxxxxxxxxxx] > Sent: Wednesday, November 09, 2011 12:13 PM > To: Hilman, Kevin > Cc: linux-kernel@xxxxxxxxxxxxxxx; Arjan van de Ven; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx; linux- > pm@xxxxxxxxxxxxxxxxxxxxxxxxxx; Chalhoub, Nicole > Subject: Re: [PATCH] CPUIdle: Reevaluate C-states under CPU load to favor > deeper C-states [...] > By setting timers when we enter non-deepest C-state possible, such that > when it fires we > can re-evaluate and try moving into deeper and deeper C-states enhancing > the > power savings is a good feature to have. > > Looking at the current implementation, is it possible to have it as > configurable option > where one can enable/disable this functionality through the backhand > driver ? The timeout values of the c state timers are set in the backhand driver. By setting the timeout to 0 the timers will not fire so you'll not have this functionality enabled > Also I am thinking, instead of having them in governor > wouldnt it be a good idea to have it implemented in > the backhand driver itself ? > --Deepthi In fact each C-state had its own configurable timer, so it is a parameter characterizing a C-state as it is for the exit_latency and target_residency parameters. And we wanted the timer to fire only when we do not go in deep Cstate due to a high load. This decision is made in the CPU idle governor. So the functionality should be seen from the governor.. Thanks and Regards Nicole _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
