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path: root/drivers/cpufreq/cpufreq_ondemand.c
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2006-03-26[PATCH] cpufreq_ondemand: add range checkDominik Brodowski
Assert that cpufreq_target is, at least, called with the minimum frequency allowed by this policy, not something lower. It triggered problems on ARM. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2006-03-26[PATCH] cpufreq_ondemand: keep ignore_nice_load value when it is reselectedEric Piel
Keep the value of ignore_nice_load of the ondemand governor even after the governor has been deselected and selected back. This is the behavior of the other exported values of the ondemand governor and it's much more user-friendly. Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2006-03-26[PATCH] cpufreq_ondemand: Warn if it cannot run due to too long transition ↵Eric Piel
latency Display a warning if the ondemand governor can not be selected due to a transition latency of the cpufreq driver which is too long. Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2006-02-28[CPUFREQ] Lots of whitespace & CodingStyle cleanup.Dave Jones
Signed-off-by: Dave Jones <davej@redhat.com>
2006-01-18[CPUFREQ] Convert drivers/cpufreq semaphores to mutexes.akpm@osdl.org
Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Dave Jones <davej@redhat.com>
2005-12-01[PATCH] cpufreq_conservative/ondemand: invert meaning of 'ignore nice'Alexander Clouter
The use of the 'ignore_nice' sysfs file is confusing to anyone using it. This removes the sysfs file 'ignore_nice' and in its place creates a 'ignore_nice_load' entry that defaults to '0'; meaning nice'd processes _are_ counted towards the 'business' calculation. WARNING: this obvious breaks any userland tools that expected ignore_nice' to exist, to draw attention to this fact it was concluded on the mailing list that the entry should be removed altogether so the userland app breaks and so the author can build simple to detect workaround. Having said that it seems currently very few tools even make use of this functionality; all I could find was a Gentoo Wiki entry. Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Dave Jones <davej@redhat.com>
2005-09-20[CPUFREQ] Avoid the ondemand cpufreq governor to use a too high frequency ↵Dave Jones
for stats. The problem is in the ondemand governor, there is a periodic measurement of the CPU usage. This CPU usage is updated by the scheduler after every tick (basically, by adding 1 either to "idle" or to "user" or to "system"). So if the frequency of the governor is too high, the stat will be meaningless (as mostly no number have changed). So this patch checks that the measurements are separated by at least 10 ticks. It means that by default, stats will have about 5% error (20 ticks). Of course those numbers can be argued but, IMHO, they look sane. The patch also includes a small clean-up to check more explictly the result of the conversion from ns to µs being null. Let's note that (on x86) this has never been really needed before 2.6.13 because HZ was always 1000. Now that HZ can be 100, some CPU might be affected by this problem. For instance when HZ=100, the centrino ,which has a 10µs transition latency, would lead to the governor allowing to read stats every tick (10ms)! Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] ondemand governor default sampling downfactor as 1Dave Jones
[PATCH] [5/5] ondemand governor default sampling downfactor as 1 Make default sampling downfactor 1. This works better with earlier auto downscaling change in ondemand governor. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] ondemand governor automatic downscalingDave Jones
[PATCH] [4/5] ondemand governor automatic downscaling Here is a change of policy for the ondemand governor. The modification concerns the frequency downscaling. Instead of decreasing to a lower frequency when the CPU usage is under 20%, this new policy automatically scales to the optimal frequency. The optimal frequency being the lowest frequency which provides enough power to not trigger the upscaling policy. Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] ondemand,conservative governor idle_tick clean-upDave Jones
[PATCH] [3/5] ondemand,conservative governor idle_tick clean-up Ondemand and conservative governor clean-up, it factorises the idle ticks measurement. Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] ondemand,conservative governor store the idle ticks for all cpusDave Jones
[PATCH] [2/5] ondemand,conservative governor store the idle ticks for all cpus Ondemand, conservative governor did not store prev_cpu_idle_up into prev_cpu_idle_down for other CPUs than the current CPU. Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] ondemand,conservative minor bug-fix and cleanupDave Jones
[PATCH] [1/5] ondemand,conservative minor bug-fix and cleanup Attached patch fixes some minor issues with Alexander's patch and related cleanup in both ondemand and conservative governor. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] Allow ondemand stepping to be changed by user.Dave Jones
Adds support so that the cpufreq change stepping is no longer fixed at 5% and can be changed dynamically by the user Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] Prevents un-necessary cpufreq changes if we are already at min/maxDave Jones
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] Add support to cpufreq_ondemand to ignore 'nice' cpu timeDave Jones
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] make cpufreq_gov_dbs staticDave Jones
This patch makes a needlessly global and EXPORT_SYMBOL'ed struct static. Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Dave Jones <davej@redhat.com>
2005-05-31[CPUFREQ] ondemand: trivial clean-upsDave Jones
Trivial ondemand governor clean-ups: - change from sampling_rate_in_HZ() to the official function usecs_to_jiffies(). - use for_each_online_cpu() to instead of using "if (cpu_online(i))" Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Dave Jones <davej@redhat.com>
2005-04-16Linux-2.6.12-rc2Linus Torvalds
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!