linux-sg2042/drivers/cpufreq
Ashok Raj c32b6b8e52 [PATCH] create and destroy cpufreq sysfs entries based on cpu notifiers
cpufreq entries in sysfs should only be populated when CPU is online state.
 When we either boot with maxcpus=x and then boot the other cpus by echoing
to sysfs online file, these entries should be created and destroyed when
CPU_DEAD is notified.  Same treatement as cache entries under sysfs.

We place the processor in the lowest frequency, so hw managed P-State
transitions can still work on the other threads to save power.

Primary goal was to just make these directories appear/disapper dynamically.

There is one in this patch i had to do, which i really dont like myself but
probably best if someone handling the cpufreq infrastructure could give
this code right treatment if this is not acceptable.  I guess its probably
good for the first cut.

- Converting lock_cpu_hotplug()/unlock_cpu_hotplug() to disable/enable preempt.
  The locking was smack in the middle of the notification path, when the
  hotplug is already holding the lock. I tried another solution to avoid this
  so avoid taking locks if we know we are from notification path. The solution
  was getting very ugly and i decided this was probably good for this iteration
  until someone who understands cpufreq could do a better job than me.

(akpm: export cpucontrol to GPL modules: drivers/cpufreq/cpufreq_stats.c now
does lock_cpu_hotplug())

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Zwane Mwaikambo <zwane@holomorphy.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:14 -08:00
..
Kconfig [CPUFREQ] Conservative cpufreq governer 2005-05-31 19:03:47 -07:00
Makefile [CPUFREQ] Conservative cpufreq governer 2005-05-31 19:03:47 -07:00
cpufreq.c [PATCH] create and destroy cpufreq sysfs entries based on cpu notifiers 2005-10-30 17:37:14 -08:00
cpufreq_conservative.c [PATCH] cpufreq: SMP fix for conservative governor 2005-10-27 16:29:24 -07:00
cpufreq_ondemand.c [CPUFREQ] ondemand governor default sampling downfactor as 1 2005-05-31 19:03:50 -07:00
cpufreq_performance.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpufreq_powersave.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpufreq_stats.c [PATCH] create and destroy cpufreq sysfs entries based on cpu notifiers 2005-10-30 17:37:14 -08:00
cpufreq_userspace.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
freq_table.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00