Doug / smarc-fsl-linux-kernel

01 Apr, 2013

8 commits

  • 987658477   cpufreq: conservative: Use an inline function to evaluate freq_target ... Browse Code »

    Use an inline function to evaluate freq_target to avoid duplicate code.

    Also, define a macro for the default frequency step.

    Signed-off-by: Stratos Karafotis
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Stratos Karafotis
     
  • 27ed3cd2e   cpufreq: conservative: Fix the logic in frequency decrease checking ... Browse Code »

    When we evaluate the CPU load for frequency decrease we have to compare
    the load against down_threshold. There is no need to subtract 10 points
    from down_threshold.

    Instead, we have to use the default down_threshold or user's selection
    unmodified.

    Signed-off-by: Stratos Karafotis
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Stratos Karafotis
     
  • 7af1c0568   cpufreq: conservative: Fix sampling_down_factor functionality ... Browse Code »

    sampling_down_factor tunable is unused since commit
    8e677ce83bf41ba9c74e5b6d9ee60b07d4e5ed93 (4 years ago).

    This patch restores the original functionality and documents the
    tunable.

    Signed-off-by: Stratos Karafotis
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Stratos Karafotis
     
  • 9366d8405   cpufreq: governors: Calculate iowait time only when necessary ... Browse Code »

    Currently we always calculate the CPU iowait time and add it to idle time.
    If we are in ondemand and we use io_is_busy, we re-calculate iowait time
    and we subtract it from idle time.

    With this patch iowait time is calculated only when necessary avoiding
    the double call to get_cpu_iowait_time_us. We use a parameter in
    function get_cpu_idle_time to distinguish when the iowait time will be
    added to idle time or not, without the need of keeping the prev_io_wait.

    Signed-off-by: Stratos Karafotis
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Stratos Karafotis
     
  • fed573d5c   cpufreq: conservative: Fix relation when decreasing frequency ... Browse Code »

    The relation should be CPUFREQ_RELATION_L to find optimal frequency
    when decreasing.

    Signed-off-by: Namhyung Kim
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Namhyung Kim
     
  • ad529a9cd   cpufreq: conservative: Break out earlier on the lowest frequency ... Browse Code »

    If we're on the lowest frequency, no need to calculate new freq.
    Break out even earlier in this case.

    Signed-off-by: Namhyung Kim
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Namhyung Kim
     
  • 031299b3b   cpufreq: governors: Avoid unnecessary per cpu timer interrupts ... Browse Code »

    Following patch has introduced per cpu timers or works for ondemand and
    conservative governors.

    commit 2abfa876f1117b0ab45f191fb1f82c41b1cbc8fe
    Author: Rickard Andersson
    Date: Thu Dec 27 14:55:38 2012 +0000

    cpufreq: handle SW coordinated CPUs

    This causes additional unnecessary interrupts on all cpus when the load is
    recently evaluated by any other cpu. i.e. When load is recently evaluated by cpu
    x, we don't really need any other cpu to evaluate this load again for the next
    sampling_rate time.

    Some sort of code is present to avoid that but we are still getting timer
    interrupts for all cpus. A good way of avoiding this would be to modify delays
    for all cpus (policy->cpus) whenever any cpu has evaluated load.

    This patch does this change and some related code cleanup.

    Signed-off-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Viresh Kumar
     
  • 4d5dcc421   cpufreq: governor: Implement per policy instances of governors ... Browse Code »

    Currently, there can't be multiple instances of single governor_type.
    If we have a multi-package system, where we have multiple instances
    of struct policy (per package), we can't have multiple instances of
    same governor. i.e. We can't have multiple instances of ondemand
    governor for multiple packages.

    Governors directory in sysfs is created at /sys/devices/system/cpu/cpufreq/
    governor-name/. Which again reflects that there can be only one
    instance of a governor_type in the system.

    This is a bottleneck for multicluster system, where we want different
    packages to use same governor type, but with different tunables.

    This patch uses the infrastructure provided by earlier patch and
    implements init/exit routines for ondemand and conservative
    governors.

    Signed-off-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Viresh Kumar
     

09 Feb, 2013

1 commit

02 Feb, 2013

5 commits

  • 4447266b8   cpufreq: governors: Remove code redundancy between governors ... Browse Code »

    With the inclusion of following patches:

    9f4eb10 cpufreq: conservative: call dbs_check_cpu only when necessary
    772b4b1 cpufreq: ondemand: call dbs_check_cpu only when necessary

    code redundancy between the conservative and ondemand governors is
    introduced again, so get rid of it.

    [rjw: Changelog]
    Signed-off-by: Viresh Kumar
    Tested-by: Fabio Baltieri
    Signed-off-by: Rafael J. Wysocki

    Viresh Kumar
     
  • 09dca5ae7   cpufreq: governors: fix misuse of cdbs.cpu ... Browse Code »

    Fix governors code to set all cpu's cdbs->cpu to the the actual cpu id
    and use cur_policy->cpu istead of cdbs->cpu to track current governor's
    leader cpu.

    Reported-by: Viresh Kumar
    Signed-off-by: Fabio Baltieri
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Fabio Baltieri
     
  • 2624f90c1   cpufreq: governors: implement generic policy_is_shared ... Browse Code »

    Implement a generic helper function policy_is_shared() to replace the
    current dbs_sw_coordinated_cpus() at cpufreq level, so that it can be
    used by code other than cpufreq governors.

    Suggested-by: Viresh Kumar
    Signed-off-by: Fabio Baltieri
    Acked-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Fabio Baltieri
     
  • 66df2a01d   cpufreq: conservative: call dbs_check_cpu only when necessary ... Browse Code »

    Modify conservative timer to not resample CPU utilization if recently
    sampled from another SW coordinated core.

    Signed-off-by: Fabio Baltieri
    Signed-off-by: Rafael J. Wysocki

    Fabio Baltieri
     
  • 2abfa876f   cpufreq: handle SW coordinated CPUs ... Browse Code »

    This patch fixes a bug that occurred when we had load on a secondary CPU
    and the primary CPU was sleeping. Only one sampling timer was spawned
    and it was spawned as a deferred timer on the primary CPU, so when a
    secondary CPU had a change in load this was not detected by the cpufreq
    governor (both ondemand and conservative).

    This patch make sure that deferred timers are run on all CPUs in the
    case of software controlled CPUs that run on the same frequency.

    Signed-off-by: Rickard Andersson
    Signed-off-by: Fabio Baltieri
    Signed-off-by: Rafael J. Wysocki

    Rickard Andersson
     

15 Nov, 2012

2 commits

  • 4471a34f9   cpufreq: governors: remove redundant code ... Browse Code »

    Initially ondemand governor was written and then using its code conservative
    governor is written. It used a lot of code from ondemand governor, but copy of
    code was created instead of using the same routines from both governors. Which
    increased code redundancy, which is difficult to manage.

    This patch is an attempt to move common part of both the governors to
    cpufreq_governor.c file to come over above mentioned issues.

    This shouldn't change anything from functionality point of view.

    Signed-off-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    Viresh Kumar
     
  • 2aacdfff9   cpufreq: Move common part from governors to separate file, v2 ... Browse Code »

    Multiple cpufreq governers have defined similar get_cpu_idle_time_***()
    routines. These routines must be moved to some common place, so that all
    governors can use them.

    So moving them to cpufreq_governor.c, which seems to be a better place for
    keeping these routines.

    Signed-off-by: Viresh Kumar
    Signed-off-by: Rafael J. Wysocki

    viresh kumar
     

03 Oct, 2012

1 commit

  • 16642a2e7   Merge tag 'pm-for-3.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm ... Browse Code »

    Pull power management updates from Rafael J Wysocki:

    - Improved system suspend/resume and runtime PM handling for the SH
    TMU, CMT and MTU2 clock event devices (also used by ARM/shmobile).

    - Generic PM domains framework extensions related to cpuidle support
    and domain objects lookup using names.

    - ARM/shmobile power management updates including improved support for
    the SH7372's A4S power domain containing the CPU core.

    - cpufreq changes related to AMD CPUs support from Matthew Garrett,
    Andre Przywara and Borislav Petkov.

    - cpu0 cpufreq driver from Shawn Guo.

    - cpufreq governor fixes related to the relaxing of limit from Michal
    Pecio.

    - OMAP cpufreq updates from Axel Lin and Richard Zhao.

    - cpuidle ladder governor fixes related to the disabling of states from
    Carsten Emde and me.

    - Runtime PM core updates related to the interactions with the system
    suspend core from Alan Stern and Kevin Hilman.

    - Wakeup sources modification allowing more helper functions to be
    called from interrupt context from John Stultz and additional
    diagnostic code from Todd Poynor.

    - System suspend error code path fix from Feng Hong.

    Fixed up conflicts in cpufreq/powernow-k8 that stemmed from the
    workqueue fixes conflicting fairly badly with the removal of support for
    hardware P-state chips. The changes were independent but somewhat
    intertwined.

    * tag 'pm-for-3.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits)
    Revert "PM QoS: Use spinlock in the per-device PM QoS constraints code"
    PM / Runtime: let rpm_resume() succeed if RPM_ACTIVE, even when disabled, v2
    cpuidle: rename function name "__cpuidle_register_driver", v2
    cpufreq: OMAP: Check IS_ERR() instead of NULL for omap_device_get_by_hwmod_name
    cpuidle: remove some empty lines
    PM: Prevent runtime suspend during system resume
    PM QoS: Use spinlock in the per-device PM QoS constraints code
    PM / Sleep: use resume event when call dpm_resume_early
    cpuidle / ACPI : move cpuidle_device field out of the acpi_processor_power structure
    ACPI / processor: remove pointless variable initialization
    ACPI / processor: remove unused function parameter
    cpufreq: OMAP: remove loops_per_jiffy recalculate for smp
    sections: fix section conflicts in drivers/cpufreq
    cpufreq: conservative: update frequency when limits are relaxed
    cpufreq / ondemand: update frequency when limits are relaxed
    properly __init-annotate pm_sysrq_init()
    cpufreq: Add a generic cpufreq-cpu0 driver
    PM / OPP: Initialize OPP table from device tree
    ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp
    cpufreq: Remove support for hardware P-state chips from powernow-k8
    ...

    Linus Torvalds
     

15 Sep, 2012

1 commit

04 Sep, 2012

1 commit

22 Aug, 2012

1 commit

20 Dec, 2011

1 commit

15 Dec, 2011

1 commit

06 Dec, 2011

1 commit

  • 3292beb34   sched/accounting: Change cpustat fields to an array ... Browse Code »

    This patch changes fields in cpustat from a structure, to an
    u64 array. Math gets easier, and the code is more flexible.

    Signed-off-by: Glauber Costa
    Reviewed-by: KAMEZAWA Hiroyuki
    Cc: Linus Torvalds
    Cc: Andrew Morton
    Cc: Paul Tuner
    Signed-off-by: Peter Zijlstra
    Link: http://lkml.kernel.org/r/1322498719-2255-2-git-send-email-glommer@parallels.com
    Signed-off-by: Ingo Molnar

    Glauber Costa
     

08 Sep, 2011

1 commit

  • 6beea0cda   nohz: Fix update_ts_time_stat idle accounting ... Browse Code »

    update_ts_time_stat currently updates idle time even if we are in
    iowait loop at the moment. The only real users of the idle counter
    (via get_cpu_idle_time_us) are CPU governors and they expect to get
    cumulative time for both idle and iowait times.
    The value (idle_sleeptime) is also printed to userspace by print_cpu
    but it prints both idle and iowait times so the idle part is misleading.

    Let's clean this up and fix update_ts_time_stat to account both counters
    properly and update consumers of idle to consider iowait time as well.
    If we do this we might use get_cpu_{idle,iowait}_time_us from other
    contexts as well and we will get expected values.

    Signed-off-by: Michal Hocko
    Cc: Dave Jones
    Cc: Arnd Bergmann
    Cc: Alexey Dobriyan
    Link: http://lkml.kernel.org/r/e9c909c221a8da402c4da07e4cd968c3218f8eb1.1314172057.git.mhocko@suse.cz
    Signed-off-by: Thomas Gleixner

    Michal Hocko
     

17 Mar, 2011

4 commits

26 Jan, 2011

1 commit

  • 57df5573a   cpufreq: use system_wq instead of dedicated workqueues ... Browse Code »

    With cmwq, there's no reason for cpufreq drivers to use separate
    workqueues. Remove the dedicated workqueues from cpufreq_conservative
    and cpufreq_ondemand and use system_wq instead. The work items are
    already sync canceled on stop, so it's already guaranteed that no work
    is running on module exit.

    Signed-off-by: Tejun Heo
    Acked-by: Dave Jones
    Cc: cpufreq@vger.kernel.org

    Tejun Heo
     

09 May, 2010

1 commit

10 Apr, 2010

1 commit

  • 6dad2a296   cpufreq: Unify sysfs attribute definition macros ... Browse Code »

    Multiple modules used to define those which are with identical
    functionality and were needlessly replicated among the different cpufreq
    drivers. Push them into the header and remove duplication.

    Signed-off-by: Borislav Petkov
    LKML-Reference:
    Reviewed-by: Thomas Renninger
    Signed-off-by: H. Peter Anvin

    Borislav Petkov
     

01 Apr, 2010

1 commit

25 Nov, 2009

1 commit

18 Nov, 2009

1 commit

  • 54c9a35d9   [CPUFREQ] Resolve time unit thinko in ondemand/conservative govs ... Browse Code »

    ondemand and conservative governors are messing up time units in the
    code path where NO_HZ is not enabled and ignore_nice is set. The walltime
    idletime stored is in jiffies and nice time calculation is happening in
    microseconds.

    The problem was reported and diagnosed by Alexander here.
    http://marc.info/?l=linux-kernel&m=125752550404513&w=2

    The patch below fixes this thinko.

    Reported-by: Alexander Miller
    Tested-by: Alexander Miller
    Signed-off-by: Venkatesh Pallipadi
    Signed-off-by: Dave Jones

    Pallipadi, Venkatesh
     

14 Aug, 2009

1 commit

  • 384be2b18   Merge branch 'percpu-for-linus' into percpu-for-next ... Browse Code »

    Conflicts:
    arch/sparc/kernel/smp_64.c
    arch/x86/kernel/cpu/perf_counter.c
    arch/x86/kernel/setup_percpu.c
    drivers/cpufreq/cpufreq_ondemand.c
    mm/percpu.c

    Conflicts in core and arch percpu codes are mostly from commit
    ed78e1e078dd44249f88b1dd8c76dafb39567161 which substituted many
    num_possible_cpus() with nr_cpu_ids. As for-next branch has moved all
    the first chunk allocators into mm/percpu.c, the changes are moved
    from arch code to mm/percpu.c.

    Signed-off-by: Tejun Heo

    Tejun Heo
     

05 Aug, 2009

1 commit

  • 26d204afa   [CPUFREQ] Fix NULL pointer dereference regression in conservative governor ... Browse Code »

    Commit ee88415caf736b89500f16e0a545614541a45005
    introduced this regression when it removed enable bit in cpu_dbs_info_s.
    That added a possibility of dbs_cpufreq_notifier getting called for a
    CPU that is not yet managed by conservative governor. That will happen
    as the transition notifier is set as soon as one CPU switches to
    conservative governor and other CPUs can get a NULL pointer dereference
    without the enable bit check. Add the enable bit back again.

    Reported-by: Lermytte Christophe
    Signed-off-by: Venkatesh Pallipadi
    Signed-off-by: Dave Jones

    Pallipadi, Venkatesh
     

07 Jul, 2009

2 commits

  • ee88415ca   [CPUFREQ] Cleanup locking in conservative governor ... Browse Code »

    Redesign the locking inside conservative driver. Make dbs_mutex handle all the
    global state changes inside the driver and invent a new percpu mutex
    to serialize percpu timer and frequency limit change.

    Signed-off-by: Venkatesh Pallipadi
    Signed-off-by: Dave Jones

    venkatesh.pallipadi@intel.com
     
  • 7d26e2d5e   [CPUFREQ] Eliminate the recent lockdep warnings in cpufreq ... Browse Code »

    Commit b14893a62c73af0eca414cfed505b8c09efc613c although it was very
    much needed to properly cleanup ondemand timer, opened-up a can of worms
    related to locking dependencies in cpufreq.

    Patch here defines the need for dbs_mutex and cleans up its usage in
    ondemand governor. This also resolves the lockdep warnings reported here

    http://lkml.indiana.edu/hypermail/linux/kernel/0906.1/01925.html
    http://lkml.indiana.edu/hypermail/linux/kernel/0907.0/00820.html

    and few others..

    Signed-off-by: Venkatesh Pallipadi
    Signed-off-by: Dave Jones

    venkatesh.pallipadi@intel.com
     

24 Jun, 2009

1 commit

  • 245b2e70e   percpu: clean up percpu variable definitions ... Browse Code »

    Percpu variable definition is about to be updated such that all percpu
    symbols including the static ones must be unique. Update percpu
    variable definitions accordingly.

    * as,cfq: rename ioc_count uniquely

    * cpufreq: rename cpu_dbs_info uniquely

    * xen: move nesting_count out of xen_evtchn_do_upcall() and rename it

    * mm: move ratelimits out of balance_dirty_pages_ratelimited_nr() and
    rename it

    * ipv4,6: rename cookie_scratch uniquely

    * x86 perf_counter: rename prev_left to pmc_prev_left, irq_entry to
    pmc_irq_entry and nmi_entry to pmc_nmi_entry

    * perf_counter: rename disable_count to perf_disable_count

    * ftrace: rename test_event_disable to ftrace_test_event_disable

    * kmemleak: rename test_pointer to kmemleak_test_pointer

    * mce: rename next_interval to mce_next_interval

    [ Impact: percpu usage cleanups, no duplicate static percpu var names ]

    Signed-off-by: Tejun Heo
    Reviewed-by: Christoph Lameter
    Cc: Ivan Kokshaysky
    Cc: Jens Axboe
    Cc: Dave Jones
    Cc: Jeremy Fitzhardinge
    Cc: linux-mm
    Cc: David S. Miller
    Cc: Peter Zijlstra
    Cc: Steven Rostedt
    Cc: Li Zefan
    Cc: Catalin Marinas
    Cc: Andi Kleen

    Tejun Heo
     

15 Jun, 2009

1 commit