Date: Mon, 15 Aug 2005 18:08:32 -0700 From: Nate Lawson <nate@root.org> To: Hajimu UMEMOTO <ume@freebsd.org> Cc: acpi@freebsd.org Subject: Re: Annoyances with passive thermal code (acpi_thermal) Message-ID: <43013C90.7040901@root.org> In-Reply-To: <ygeacjj81bw.wl%ume@mahoroba.org> References: <20050814023842.C0D845D07@ptavv.es.net> <ygezmrk2van.wl%ume@mahoroba.org> <ygeoe7zacqg.wl%ume@mahoroba.org> <4300C5DF.40409@root.org> <ygek6in5e4t.wl%ume@mahoroba.org> <ygeacjj81bw.wl%ume@mahoroba.org>
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Hajimu UMEMOTO wrote: > I found the cause. The saved_level is not stackable. So, an initial > cpu level was saved, then a cpu level at CPUFREQ_PRIO_USER was not > saved. Here is a patch to solve this problem: > > Index: sys/kern/kern_cpu.c > diff -u -p sys/kern/kern_cpu.c.orig sys/kern/kern_cpu.c > --- sys/kern/kern_cpu.c.orig Mon Apr 11 04:11:23 2005 > +++ sys/kern/kern_cpu.c Tue Aug 16 03:31:55 2005 > @@ -336,6 +336,7 @@ cf_set_method(device_t dev, const struct > */ > if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && > sc->saved_level.total_set.freq == CPUFREQ_VAL_UNKNOWN && > + sc->curr_priority > CPUFREQ_PRIO_LOWEST && > priority > sc->curr_priority) { > CF_DEBUG("saving level, freq %d prio %d\n", > sc->curr_level.total_set.freq, sc->curr_priority); > > I think it is enough to solve CPUFREQ_PRIO_USER v.s. CPUFREQ_PRIO_KERN > issue. However, it may better to have saved_level at each priority, > IMHO. The original intention was that we would save a stack of values and that a CPUFREQ_SET(NULL, prio) would restore the last setting for the priority before "prio". Example: freq = 1000 Mhz CPUFREQ_SET(1200, PRIO_USER) -- saves 1000 Mhz @PRIO_LOWEST freq = 1200 CPUFREQ_SET(1800, PRIO_LOWEST) -- EPERM since prio too low freq = 1200 CPUFREQ_SET(1700, PRIO_KERN) -- saves 1200 Mhz @PRIO_USER freq = 1700 CPUFREQ_SET(1900, PRIO_KERN) -- no saves since prio same as before freq = 1900 CPUFREQ_SET(NULL, PRIO_KERN) -- restores 1200 Mhz @PRIO_USER freq = 1200 CPUFREQ_SET(NULL, PRIO_USER) -- restores 1000 Mhz @PRIO_LOWEST freq = 1000 Implementing this as a simple array would make sense. Would you be willing to do this? If not, your patch should be fine for now. -- Nate
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