2012/1/30 Olof Johansson <olof@xxxxxxxxx>: > On Sat, Jan 28, 2012 at 6:58 AM, Barry Song <21cnbao@xxxxxxxxx> wrote: >> hi guys, >> As tegra3 is using vSMP (Variable Symmetric Multiprocessing) arch, >> there are 4 high-performance(G) cores and one low-power(LP) core. At >> runtime, both cpu dynamic hotplug and dynamic LP/G swith are used in a >> real tegra3 product as a DVFS way to save power. kernel log in EeePad: >> *cpu dynamic hotplug* >> <4>[104626.426957] CPU1: Booted secondary processor >> <7>[104627.427412] tegra CPU: force EDP limit 720000 kHz >> <4>[104627.427670] CPU2: Booted secondary processor >> <4>[104628.537005] stop_machine_cpu_stop cpu=0 >> <4>[104628.537017] stop_machine_cpu_stop cpu=2 >> <4>[104628.537059] stop_machine_cpu_stop cpu=1 >> <4>[104628.537702] __stop_cpus: wait_for_completion_timeout+ >> <4>[104628.537810] __stop_cpus: smp=0 done.executed=1 done.ret =0- >> <5>[104628.537960] CPU1: clean shutdown >> <4>[104630.537092] stop_machine_cpu_stop cpu=0 >> <4>[104630.537172] stop_machine_cpu_stop cpu=2 >> <4>[104630.537739] __stop_cpus: wait_for_completion_timeout+ >> <4>[104630.538060] __stop_cpus: smp=0 done.executed=1 done.ret =0- >> <5>[104630.538203] CPU2: clean shutdown >> <4>[104631.306984] tegra_watchdog_touch >> >> *G<->LP switch* >> <3>[104666.799152] LP=>G: prolog 22 us, switch 2129 us, epilog 24 us, >> total 2175 us >> <3>[104667.807273] G=>LP: prolog 18 us, switch 157 us, epilog 25 us, >> total 200 us >> <4>[104671.407008] tegra_watchdog_touch >> <4>[104671.408816] nct1008_get_temp: ret temp=35C >> <3>[104671.939060] LP=>G: prolog 17 us, switch 2127 us, epilog 22 us, >> total 2166 us >> <3>[104672.938091] G=>LP: prolog 18 us, switch 156 us, epilog 24 us, >> total 198 us >> >> Related codes don't exist in both http://nv-tegra.nvidia.com/gitweb >> and kernel org, any people know the address to locate these kernel >> source codes? > > > You need to contact the manufacturer of the device to get the exact > sources (I expect). i guess the manufacturer of the device got these kernel codes from Nvidia, not by themselves. > > That being said, from a quick glance I found code that prints out > those messages on the freshest branch (named rel-14r7) at > nv-tegra.nvidia.com's linux-2.6 repo. Olof, thanks a lot. i saw that tree before, but didn't grep in detail. now i do find auto hotplug and big/little switch codes in it after you point out. there is something interesting in arch/arm/mach-tegra/cpu-tegra3.c and arch/arm/mach-tegra/cpu-tegra.c but not in lkml yet. > > > -Olof -barry -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
