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* [CPUFREQ] Only set sampling_rate_max deprecated, sampling_rate_min is usefulThomas Renninger2009-06-15
| | | | | | | | Update the documentation accordingly. Cleanup and use printk_once. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] ondemand: Uncouple minimal sampling rate from HZ in NO_HZ caseThomas Renninger2009-06-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | With this patch you have following minimal sampling rate restrictions: Kernel restrictions: If CONFIG_NO_HZ is set, the limit is 10ms fixed. If CONFIG_NO_HZ is not set or no_hz=off boot parameter is used, the limits depend on the CONFIG_HZ option: HZ=1000: min=20000us (20ms) HZ=250: min=80000us (80ms) HZ=100: min=200000us (200ms) HW restrictions: Do not sample/poll more often than HW latency * 100 exported by the low level cpufreq HW driver The higher value of above restrictions is the minimal sampling rate that can be set (and can be seen via ondemand/sampling_rate_min sysfs file) Default sampling rate still is HW latency * 1000, but this will now end up in lower values on latest (Intel and AMD) hardware as these can switch really fast and sampling rate mostly was limited to the 80ms or 200ms (depending on whether HZ=250 or HZ=1000 is used). Signed-off-by: Thomas Renninger <trenn@suse.de> Cc: Pallipadi Venkatesh <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* cpumask: alloc zeroed cpumask for static cpumask_var_tsYinghai Lu2009-06-09
| | | | | | | | These are defined as static cpumask_var_t so if MAXSMP is not used, they are cleared already. Avoid surprises when MAXSMP is enabled. Signed-off-by: Yinghai Lu <yinghai.lu@kernel.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* [CPUFREQ] fix timer teardown in ondemand governorMathieu Desnoyers2009-05-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Rafael J. Wysocki (rjw@sisk.pl) wrote: > This message has been generated automatically as a part of a report > of regressions introduced between 2.6.28 and 2.6.29. > > The following bug entry is on the current list of known regressions > introduced between 2.6.28 and 2.6.29. Please verify if it still should > be listed and let me know (either way). > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13186 > Subject : cpufreq timer teardown problem > Submitter : Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> > Date : 2009-04-23 14:00 (24 days old) > References : http://marc.info/?l=linux-kernel&m=124049523515036&w=4 > Handled-By : Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> > Patch : http://patchwork.kernel.org/patch/19754/ > http://patchwork.kernel.org/patch/19753/ > (updated changelog) cpufreq fix timer teardown in ondemand governor The problem is that dbs_timer_exit() uses cancel_delayed_work() when it should use cancel_delayed_work_sync(). cancel_delayed_work() does not wait for the workqueue handler to exit. The ondemand governor does not seem to be affected because the "if (!dbs_info->enable)" check at the beginning of the workqueue handler returns immediately without rescheduling the work. The conservative governor in 2.6.30-rc has the same check as the ondemand governor, which makes things usually run smoothly. However, if the governor is quickly stopped and then started, this could lead to the following race : dbs_enable could be reenabled and multiple do_dbs_timer handlers would run. This is why a synchronized teardown is required. The following patch applies to, at least, 2.6.28.x, 2.6.29.1, 2.6.30-rc2. Depends on patch cpufreq: remove rwsem lock from CPUFREQ_GOV_STOP call Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> CC: Andrew Morton <akpm@linux-foundation.org> CC: gregkh@suse.de CC: stable@kernel.org CC: cpufreq@vger.kernel.org CC: Ingo Molnar <mingo@elte.hu> CC: rjw@sisk.pl CC: Ben Slusky <sluskyb@paranoiacs.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] fix timer teardown in conservative governorMathieu Desnoyers2009-05-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Rafael J. Wysocki (rjw@sisk.pl) wrote: > This message has been generated automatically as a part of a report > of regressions introduced between 2.6.28 and 2.6.29. > > The following bug entry is on the current list of known regressions > introduced between 2.6.28 and 2.6.29. Please verify if it still should > be listed and let me know (either way). > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13186 > Subject : cpufreq timer teardown problem > Submitter : Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> > Date : 2009-04-23 14:00 (24 days old) > References : http://marc.info/?l=linux-kernel&m=124049523515036&w=4 > Handled-By : Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> > Patch : http://patchwork.kernel.org/patch/19754/ > http://patchwork.kernel.org/patch/19753/ > (re-send with updated changelog) cpufreq fix timer teardown in conservative governor The problem is that dbs_timer_exit() uses cancel_delayed_work() when it should use cancel_delayed_work_sync(). cancel_delayed_work() does not wait for the workqueue handler to exit. The ondemand governor does not seem to be affected because the "if (!dbs_info->enable)" check at the beginning of the workqueue handler returns immediately without rescheduling the work. The conservative governor in 2.6.30-rc has the same check as the ondemand governor, which makes things usually run smoothly. However, if the governor is quickly stopped and then started, this could lead to the following race : dbs_enable could be reenabled and multiple do_dbs_timer handlers would run. This is why a synchronized teardown is required. Depends on patch cpufreq: remove rwsem lock from CPUFREQ_GOV_STOP call The following patch applies to 2.6.30-rc2. Stable kernels have a similar issue which should also be fixed, but the code changed between 2.6.29 and 2.6.30, so this patch only applies to 2.6.30-rc. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> CC: Andrew Morton <akpm@linux-foundation.org> CC: gregkh@suse.de CC: stable@kernel.org CC: cpufreq@vger.kernel.org CC: Ingo Molnar <mingo@elte.hu> CC: rjw@sisk.pl CC: Ben Slusky <sluskyb@paranoiacs.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP callMathieu Desnoyers2009-05-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Rafael J. Wysocki (rjw@sisk.pl) wrote: > This message has been generated automatically as a part of a report > of regressions introduced between 2.6.28 and 2.6.29. > > The following bug entry is on the current list of known regressions > introduced between 2.6.28 and 2.6.29. Please verify if it still should > be listed and let me know (either way). > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13186 > Subject : cpufreq timer teardown problem > Submitter : Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> > Date : 2009-04-23 14:00 (24 days old) > References : http://marc.info/?l=linux-kernel&m=124049523515036&w=4 > Handled-By : Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> > Patch : http://patchwork.kernel.org/patch/19754/ > http://patchwork.kernel.org/patch/19753/ The patches linked above depend on the following patch to remove circular locking dependency : cpufreq: remove rwsem lock from CPUFREQ_GOV_STOP call (the following issue was faced when using cancel_delayed_work_sync() in the timer teardown (which fixes a race). * KOSAKI Motohiro (kosaki.motohiro@jp.fujitsu.com) wrote: > Hi > > my box output following warnings. > it seems regression by commit 7ccc7608b836e58fbacf65ee4f8eefa288e86fac. > > A: work -> do_dbs_timer() -> cpu_policy_rwsem > B: store() -> cpu_policy_rwsem -> cpufreq_governor_dbs() -> work > > Hrm, I think it must be due to my attempt to fix the timer teardown race in ondemand governor mixed with new locking behavior in 2.6.30-rc. The rwlock seems to be taken around the whole call to cpufreq_governor_dbs(), when it should be only taken around accesses to the locked data, and especially *not* around the call to dbs_timer_exit(). Reverting my fix attempt would put the teardown race back in place (replacing the cancel_delayed_work_sync by cancel_delayed_work). Instead, a proper fix would imply modifying this critical section : cpufreq.c: __cpufreq_remove_dev() ... if (cpufreq_driver->target) __cpufreq_governor(data, CPUFREQ_GOV_STOP); unlock_policy_rwsem_write(cpu); To make sure the __cpufreq_governor() callback is not called with rwsem held. This would allow execution of cancel_delayed_work_sync() without being nested within the rwsem. Applies on top of the 2.6.30-rc5 tree. Required to remove circular dep in teardown of both conservative and ondemande governors so they can use cancel_delayed_work_sync(). CPUFREQ_GOV_STOP does not modify the policy, therefore this locking seemed unneeded. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Greg KH <greg@kroah.com> CC: Ingo Molnar <mingo@elte.hu> CC: "Rafael J. Wysocki" <rjw@sisk.pl> CC: Ben Slusky <sluskyb@paranoiacs.org> CC: Chris Wright <chrisw@sous-sol.org> CC: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Jones <davej@redhat.com>
* Merge branch 'next' of ↵Linus Torvalds2009-03-26
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: (35 commits) [CPUFREQ] Prevent p4-clockmod from auto-binding to the ondemand governor. [CPUFREQ] Make cpufreq-nforce2 less obnoxious [CPUFREQ] p4-clockmod reports wrong frequency. [CPUFREQ] powernow-k8: Use a common exit path. [CPUFREQ] Change link order of x86 cpufreq modules [CPUFREQ] conservative: remove 10x from def_sampling_rate [CPUFREQ] conservative: fixup governor to function more like ondemand logic [CPUFREQ] conservative: fix dbs_cpufreq_notifier so freq is not locked [CPUFREQ] conservative: amend author's email address [CPUFREQ] Use swap() in longhaul.c [CPUFREQ] checkpatch cleanups for acpi-cpufreq [CPUFREQ] powernow-k8: Only print error message once, not per core. [CPUFREQ] ondemand/conservative: sanitize sampling_rate restrictions [CPUFREQ] ondemand/conservative: deprecate sampling_rate{min,max} [CPUFREQ] powernow-k8: Always compile powernow-k8 driver with ACPI support [CPUFREQ] Introduce /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_transition_latency [CPUFREQ] checkpatch cleanups for powernow-k8 [CPUFREQ] checkpatch cleanups for ondemand governor. [CPUFREQ] checkpatch cleanups for powernow-k7 [CPUFREQ] checkpatch cleanups for speedstep related drivers. ...
| * [CPUFREQ] conservative: remove 10x from def_sampling_rateAlexander Clouter2009-02-24
| | | | | | | | | | | | | | | | | | | | AMD users get particular hit by this issue (bug 8081) as it caps at typically 90 seconds as the minimum period for a frequency change. Harsh eh? Years ago I borked this buy puting the 10x in the wrong place...I fix that by removing it altogether. Signed-off-by: Alexander Clouter <alex@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] conservative: fixup governor to function more like ondemand logicAlexander Clouter2009-02-24
| | | | | | | | | | | | | | | | As conservative is based off ondemand the codebases occasionally need to be resync'd. This patch, although ugly, does this. Signed-off-by: Alexander Clouter <alex@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] conservative: fix dbs_cpufreq_notifier so freq is not lockedAlexander Clouter2009-02-24
| | | | | | | | | | | | | | | | | | | | | | | | When someone added the dbs_cpufreq_notifier section to the governor the code ended up causing the frequency to only fall. This is because requested_freq is tinkered with and that should only modified if it has an invlaid value due to changes in the available frequency ranges This should fix #10055. Signed-off-by: Alexander Clouter <alex@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] conservative: amend author's email addressAlexander Clouter2009-02-24
| | | | | | | | | | | | | | Amend author's email address. Signed-off-by: Alexander Clouter <alex@digriz.org.uk> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] ondemand/conservative: sanitize sampling_rate restrictionsThomas Renninger2009-02-24
| | | | | | | | | | | | | | | | Limit sampling rate to transition_latency * 100 or kernel limits. If sampling_rate is tried to be set too low, set the lowest allowed value. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] ondemand/conservative: deprecate sampling_rate{min,max}Thomas Renninger2009-02-24
| | | | | | | | | | | | | | The same info can be obtained via the transition_latency sysfs file Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] Introduce ↵Thomas Renninger2009-02-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_transition_latency It's not only useful for the ondemand and conservative governors, but also for userspace daemons to know about the HW transition latency of the CPU. It is especially useful for userspace to know about this value when the ondemand or conservative governors are run. The sampling rate control value depends on it and for userspace being able to set sane tuning values there it has to know about the transition latency. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] checkpatch cleanups for ondemand governor.Dave Jones2009-02-24
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] checkpatch cleanups for freq_tableDave Jones2009-02-24
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] checkpatch cleanups for userspace governorDave Jones2009-02-24
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] checkpatch cleanups for cpufreq_statsDave Jones2009-02-24
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] checkpatch cleanups for conservative governorDave Jones2009-02-24
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
| * [CPUFREQ] checkpatch cleanups for cpufreq coreDave Jones2009-02-24
| | | | | | | | Signed-off-by: Dave Jones <davej@redhat.com>
* | Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod."Dave Jones2009-03-09
|/ | | | | | | | | | | | | | | | | | | | This reverts commit e088e4c9cdb618675874becb91b2fd581ee707e6. Removing the sysfs interface for p4-clockmod was flagged as a regression in bug 12826. Course of action: - Find out the remaining causes of overheating, and fix them if possible. ACPI should be doing the right thing automatically. If it isn't, we need to fix that. - mark p4-clockmod ui as deprecated - try again with the removal in six months. It's not really feasible to printk about the deprecation, because it needs to happen at all the sysfs entry points, which means adding a lot of strcmp("p4-clockmod".. calls to the core, which.. bleuch. Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Make ignore_nice_load setting of ondemand work as expected.Venkatesh Pallipadi2009-02-05
| | | | | | | | | | | | | ondemand micro-accounting of idle time changes broke ignore_nice_load sysfs setting due to a thinko in the code. The bug entry: http://bugzilla.kernel.org/show_bug.cgi?id=12310 Reported-by: Jim Bray <jimsantelmo@gmail.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* Merge branch 'cpus4096-for-linus' of ↵Linus Torvalds2009-01-10
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: [IA64] fix typo in cpumask_of_pcibus() x86: fix x86_32 builds for summit and es7000 arch's cpumask: use work_on_cpu in acpi-cpufreq.c for read_measured_perf_ctrs cpumask: use work_on_cpu in acpi-cpufreq.c for drv_read and drv_write cpumask: use cpumask_var_t in acpi-cpufreq.c cpumask: use work_on_cpu in acpi/cstate.c cpumask: convert struct cpufreq_policy to cpumask_var_t cpumask: replace CPUMASK_ALLOC etc with cpumask_var_t x86: cleanup remaining cpumask_t ops in smpboot code cpumask: update pci_bus_show_cpuaffinity to use new cpumask API cpumask: update local_cpus_show to use new cpumask API ia64: cpumask fix for is_affinity_mask_valid()
| * cpumask: convert struct cpufreq_policy to cpumask_var_tRusty Russell2009-01-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: use new cpumask API to reduce memory usage This is part of an effort to reduce structure sizes for machines configured with large NR_CPUS. cpumask_t gets replaced by cpumask_var_t, which is either struct cpumask[1] (small NR_CPUS) or struct cpumask * (large NR_CPUS). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Acked-by: Dave Jones <davej@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | trivial: fix an -> a typos in documentation and commentsFrederik Schwarzer2009-01-06
|/ | | | | | | | | | | It is always "an" if there is a vowel _spoken_ (not written). So it is: "an hour" (spoken vowel) but "a uniform" (spoken 'j') Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* [CPUFREQ] Fix on resume, now preserves user policy min/max.Mike Chan2008-12-05
| | | | | | | | | | | Previously driver resume would always set the current policy min/max with the cpuinfo min/max, defined by user_policy.min/max. Resulting in a reset of policy settings when policy.min/max != cpuinfo.min/max when coming out of suspend. Now user_policy is saved as the policy instead of cpuinfo to preserve what the user actually set. Signed-off-by: Mike Chan <mike@android.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Disable sysfs ui for p4-clockmod.Matthew Garrett2008-12-05
| | | | | | | | | | | | | | | | | | | | p4-clockmod has a long history of abuse. It pretends to be a CPU frequency scaling driver, even though it doesn't actually change the CPU frequency, but instead just modulates the frequency with wait-states. The biggest misconception is that when running at the lower 'frequency' p4-clockmod is saving power. This isn't the case, as workloads running slower take longer to complete, preventing the CPU from entering deep C states. However p4-clockmod does have a purpose. It can prevent overheating. Having it hooked up to the cpufreq interfaces is the wrong way to achieve cooling however. It should instead be hooked up to ACPI. This diff introduces a means for a cpufreq driver to register with the cpufreq core, but not present a sysfs interface. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Fix BUG: using smp_processor_id() in preemptible codeAndrea Righi2008-10-09
| | | | | | | | | | | | | | | | | | | | Use get_cpu()/put_cpu() in cpufreq_ondemand init routine, instead of smp_processor_id() to avoid the following BUG: [ 35.313118] BUG: using smp_processor_id() in preemptible [00000000] code=: modprobe/4952 [ 35.313132] caller is cpufreq_gov_dbs_init+0xa/0x8f [cpufreq_ondemand] [ 35.313140] Pid: 4952, comm: modprobe Not tainted 2.6.27-rc5-mm1 #23 [ 35.313145] Call Trace: [ 35.313158] [<ffffffff80361ff7>] debug_smp_processor_id+0xd7/0xe0 [ 35.313167] [<ffffffffa010800a>] cpufreq_gov_dbs_init+0xa/0x8f [cpufreq_ondemand] [ 35.313176] [<ffffffff8020903b>] _stext+0x3b/0x160 [ 35.313185] [<ffffffff804768c5>] __mutex_unlock_slowpath+0xe5/0x190 [ 35.313195] [<ffffffff8026236a>] trace_hardirqs_on_caller+0xca/0x140 [ 35.313205] [<ffffffff8026ef4c>] sys_init_module+0xdc/0x210 [ 35.313212] [<ffffffff8020b7cb>] system_call_fastpath+0x16/0x1b Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Don't export governors for default governorSven Wegener2008-10-09
| | | | | | | | | | | | | | | | | We don't need to export the governors for use as the default governor, because the default governor will be built-in anyway and we can access the symbol directly. This also fixes the following sparse warnings: drivers/cpufreq/cpufreq_conservative.c:578:25: warning: symbol 'cpufreq_gov_conservative' was not declared. Should it be static? drivers/cpufreq/cpufreq_ondemand.c:582:25: warning: symbol 'cpufreq_gov_ondemand' was not declared. Should it be static? drivers/cpufreq/cpufreq_performance.c:39:25: warning: symbol 'cpufreq_gov_performance' was not declared. Should it be static? drivers/cpufreq/cpufreq_powersave.c:38:25: warning: symbol 'cpufreq_gov_powersave' was not declared. Should it be static? drivers/cpufreq/cpufreq_userspace.c:190:25: warning: symbol 'cpufreq_gov_userspace' was not declared. Should it be static? Signed-off-by: Sven Wegener <sven.wegener@stealer.net> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ][6/6] cpufreq: Add idle microaccounting in ondemand governorvenkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | Use get_cpu_idle_time_us() to get micro-accounted idle information. This enables ondemand to get more accurate idle and busy timings than the jiffy based calculation. As a result, we can decrease the ondemand safety gaurd band from 80-10 to 95-3. Results in more aggressive power savings. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ][4/6] cpufreq_ondemand: Parameterize down differentialvenkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | Use a parameter for down differential, instead of hardcoded 10%. Follow-on patch changes the down-differential dynamically, based on whether we are using idle micro-accounting or not. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ][3/6] cpufreq: get_cpu_idle_time() changes in ondemand for ↵venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | idle-microaccounting Preparatory changes for doing idle micro-accounting in ondemand governor. get_cpu_idle_time() gets extra parameter and returns idle time and also the wall time that corresponds to the idle time measurement. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ][2/6] cpufreq: Change load calculation in ondemand for software ↵venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | coordination Change the load calculation algorithm in ondemand to work well with software coordination of frequency across the dependent cpus. Multiply individual CPU utilization with the average freq of that logical CPU during the measurement interval (using getavg call). And find the max CPU utilization number in terms of CPU freq. That number is then used to get to the target freq for next sampling interval. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ][1/6] cpufreq: Add cpu number parameter to __cpufreq_driver_getavg()venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | Add a cpu parameter to __cpufreq_driver_getavg(). This is needed for software cpufreq coordination where policy->cpu may not be same as the CPU on which we want to getavg frequency. A follow-on patch will use this parameter to getavg freq from all cpus in policy->cpus. Change since last patch. Fix the offline/online and suspend/resume oops reported by Youquan Song <youquan.song@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] use deferrable delayed work init in conservative governorBen Slusky2008-10-09
| | | | | | | | | | Venki Pallipadi made a similar change to the ondemand governor a while back (in commit 28287033e12463c8ff89f1ea8038783d0360391c). It seems to work just as well in the conservative governor, leading to fewer wakeups as reported by powertop. Signed-off-by: Ben Slusky <sluskyb@paranoiacs.org> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] drivers/cpufreq/cpufreq.c: Adjust error handling code involving ↵Julia Lawall2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cpufreq_cpu_put After calling cpufreq_cpu_get, error handling code should call cpufreq_cpu_put. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r@ expression x,E; statement S; position p1,p2,p3; @@ ( if ((x = cpufreq_cpu_get@p1(...)) == NULL || ...) S | x = cpufreq_cpu_get@p1(...) ... when != x if (x == NULL || ...) S ) <... if@p3 (...) { ... when != cpufreq_cpu_put(x) when != if (x) { ... cpufreq_cpu_put(x); ...} return@p2 ...; } ...> ( return x; | return 0; | x = E | E = x | cpufreq_cpu_put(x) ) @exists@ position r.p1,r.p2,r.p3; expression x; int ret != 0; statement S; @@ * x = cpufreq_cpu_get@p1(...) <... * if@p3 (...) S ...> * return@p2 \(NULL\|ret\); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] add error handling for cpufreq_register_governor() errorAkinobu Mita2008-10-09
| | | | | | | | Add error handling for cpufreq_register_governor() error Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: cpufreq@lists.linux.org.uk Signed-off-by: Dave Jones <davej@redhat.com>
* [CPUFREQ] Fix -Wshadow warning in conservative governor.Dave Jones2008-08-08
| | | | | | | | drivers/cpufreq/cpufreq_conservative.c:336:15: warning: symbol 'freq_step' shadows an earlier one Just rename the local variable. Signed-off-by: Dave Jones <davej@redhat.com>
* cpufreq acpi: only call _PPC after cpufreq ACPI init funcs got called alreadyThomas Renninger2008-07-30
| | | | | | | | | | | | | | | | | | | | | Ingo Molnar provided a fix to not call _PPC at processor driver initialization time in "[PATCH] ACPI: fix cpufreq regression" (git commit e4233dec749a3519069d9390561b5636a75c7579) But it can still happen that _PPC is called at processor driver initialization time. This patch should make sure that this is not possible anymore. Signed-off-by: Thomas Renninger <trenn@suse.de> Cc: Andi Kleen <andi@firstfloor.org> Cc: Len Brown <lenb@kernel.org> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'cpus4096-for-linus' of ↵Linus Torvalds2008-07-23
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (31 commits) NR_CPUS: Replace NR_CPUS in speedstep-centrino.c cpumask: Provide a generic set of CPUMASK_ALLOC macros, FIXUP NR_CPUS: Replace NR_CPUS in cpufreq userspace routines NR_CPUS: Replace per_cpu(..., smp_processor_id()) with __get_cpu_var NR_CPUS: Replace NR_CPUS in arch/x86/kernel/genapic_flat_64.c NR_CPUS: Replace NR_CPUS in arch/x86/kernel/genx2apic_uv_x.c NR_CPUS: Replace NR_CPUS in arch/x86/kernel/cpu/proc.c NR_CPUS: Replace NR_CPUS in arch/x86/kernel/cpu/mcheck/mce_64.c cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c, fix cpumask: Use optimized CPUMASK_ALLOC macros in the centrino_target cpumask: Provide a generic set of CPUMASK_ALLOC macros cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c cpumask: Optimize cpumask_of_cpu in kernel/time/tick-common.c cpumask: Optimize cpumask_of_cpu in drivers/misc/sgi-xp/xpc_main.c cpumask: Optimize cpumask_of_cpu in arch/x86/kernel/ldt.c cpumask: Optimize cpumask_of_cpu in arch/x86/kernel/io_apic_64.c cpumask: Replace cpumask_of_cpu with cpumask_of_cpu_ptr Revert "cpumask: introduce new APIs" cpumask: make for_each_cpu_mask a bit smaller net: Pass reference to cpumask variable in net/sunrpc/svc.c ... Fix up trivial conflicts in drivers/cpufreq/cpufreq.c manually
| * NR_CPUS: Replace NR_CPUS in cpufreq userspace routinesMike Travis2008-07-20
| | | | | | | | | | | | | | | | | | | | | | | | * Replace arrays sized by NR_CPUS with percpu variables. Prior reference: http://marc.info/?l=linux-kernel&m=120251421825989&w=4 Subject: [PATCH 1/4] cpufreq: change cpu freq tables to per_cpu variables From: Mike Travis <travis () sgi ! com> Date: 2008-02-08 23:37:39 Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * Merge commit 'v2.6.26-rc9' into cpus4096Ingo Molnar2008-07-06
| |\
| * | cpufreq: use performance variant for_each_cpu_mask_nrMike Travis2008-05-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Change references from for_each_cpu_mask to for_each_cpu_mask_nr where appropriate Reviewed-by: Paul Jackson <pj@sgi.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | | Merge branch 'next' of ↵Linus Torvalds2008-07-21
|\ \ \ | |_|/ |/| | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] cpufreq: remove CVS keywords [CPUFREQ] change cpu freq arrays to per_cpu variables
| * | [CPUFREQ] change cpu freq arrays to per_cpu variablesMike Travis2008-05-19
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | Change cpufreq_policy and cpufreq_governor pointer tables from arrays to per_cpu variables in the cpufreq subsystem. Also some minor complaints from checkpatch.pl fixed. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Dave Jones <davej@redhat.com>
* | Merge branch 'fixes' of ↵Linus Torvalds2008-06-09
|\ \ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] Fix format string bug.
| * | [CPUFREQ] Fix format string bug.Chris Wright2008-06-09
| | | | | | | | | | | | | | | | | | | | | | | | Format string bug. Not exploitable, as this is only writable by root, but worth fixing all the same. Spotted-by: Ilja van Sprundel <ilja@netric.org> Signed-off-by: Dave Jones <davej@redhat.com>
* | | cpufreq: fix null object access on Transmeta CPUCHIKAMA masaki2008-06-06
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If cpu specific cpufreq driver(i.e. longrun) has "setpolicy" function, governor object isn't set into cpufreq_policy object at "__cpufreq_set_policy" function in driver/cpufreq/cpufreq.c . This causes a null object access at "store_scaling_setspeed" and "show_scaling_setspeed" function in driver/cpufreq/cpufreq.c when reading or writing through /sys interface (ex. cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed) Addresses: http://bugzilla.kernel.org/show_bug.cgi?id=10654 https://bugzilla.redhat.com/show_bug.cgi?id=443354 Signed-off-by: CHIKAMA Masaki <masaki.chikama@gmail.com> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Chuck Ebbert <cebbert@redhat.com> Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | [CPUFREQ] fix double unlock of cpu_policy_rwsem in drivers/cpufreq/cpufreq.cLothar Waßmann2008-05-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In drivers/cpufreq/cpufreq.c the function cpufreq_add_dev() takes the error exit 'err_out_unregister' from different places once with the 'cpu_policy_rwsem' lock held, once with the lock released: | if (ret) | goto err_out_unregister; | } | | policy->governor = NULL; /* to assure that the starting sequence is | * run in cpufreq_set_policy */ | | /* set default policy */ | ret = __cpufreq_set_policy(policy, &new_policy); | policy->user_policy.policy = policy->policy; | policy->user_policy.governor = policy->governor; | | unlock_policy_rwsem_write(cpu); | | if (ret) { | dprintk("setting policy failed\n"); | goto err_out_unregister; | } This leads to the following error message in case of a failing __cpufreq_set_policy() call: ===================================== [ BUG: bad unlock balance detected! ] ------------------------------------- swapper/1 is trying to release lock (&per_cpu(cpu_policy_rwsem, cpu)) at: [<c01b4564>] unlock_policy_rwsem_write+0x30/0x40 but there are no more locks to release! other info that might help us debug this: 1 lock held by swapper/1: #0: (sysdev_drivers_lock){--..}, at: [<c018fd18>] sysdev_driver_register+0x74/0x130 stack backtrace: [<c002f588>] (dump_stack+0x0/0x14) from [<c00692fc>] (print_unlock_inbalance_bug+0xc8/0x104) [<c0069234>] (print_unlock_inbalance_bug+0x0/0x104) from [<c006b7ac>] (lock_release_non_nested+0xc4/0x19c) r6:00000028 r5:c3c1ab80 r4:c01b4564 [<c006b6e8>] (lock_release_non_nested+0x0/0x19c) from [<c006b9e0>] (lock_release+0x15c/0x18c) r8:60000013 r7:00000001 r6:c01b4564 r5:c0541bb4 r4:c3c1ab80 [<c006b884>] (lock_release+0x0/0x18c) from [<c0061ba0>] (up_write+0x24/0x30) r8:c0541b80 r7:00000000 r6:ffffffea r5:c3c34828 r4:c0541b8c [<c0061b7c>] (up_write+0x0/0x30) from [<c01b4564>] (unlock_policy_rwsem_write+0x30/0x40) r4:c3c34884 [<c01b4534>] (unlock_policy_rwsem_write+0x0/0x40) from [<c01b4c40>] (cpufreq_add_dev+0x324/0x398) [<c01b491c>] (cpufreq_add_dev+0x0/0x398) from [<c018fd64>] (sysdev_driver_register+0xc0/0x130) [<c018fca4>] (sysdev_driver_register+0x0/0x130) from [<c01b3574>] (cpufreq_register_driver+0xbc/0x174) Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Dave Jones <davej@redhat.com>
* | [CPUFREQ] clarify license of freq_table.cDominik Brodowski2008-05-22
|/ | | | | Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Dave Jones <davej@redhat.com>
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