1. 21 Jun, 2013 1 commit
    • Stephen Boyd's avatar
      sched_clock: Add temporary asm/sched_clock.h · 629a6a2b
      Stephen Boyd authored
      Some new users of the ARM sched_clock framework are going through
      the arm-soc tree. Before 38ff87f7 (sched_clock: Make ARM's
      sched_clock generic for all architectures, 2013-06-01) the header
      file was in asm, but now it's in linux. One solution would be to
      do an evil merge of the arm-soc tree and fix up the asm users,
      but it's easier to add a temporary asm header that we can remove
      along with the few stragglers after the merge window is over.
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      629a6a2b
  2. 18 Jun, 2013 1 commit
  3. 17 Jun, 2013 1 commit
    • Stephen Boyd's avatar
      ARM: sched_clock: Load cycle count after epoch stabilizes · 336ae118
      Stephen Boyd authored
      There is a small race between when the cycle count is read from
      the hardware and when the epoch stabilizes. Consider this
      scenario:
      
       CPU0                           CPU1
       ----                           ----
       cyc = read_sched_clock()
       cyc_to_sched_clock()
                                       update_sched_clock()
                                        ...
                                        cd.epoch_cyc = cyc;
        epoch_cyc = cd.epoch_cyc;
        ...
        epoch_ns + cyc_to_ns((cyc - epoch_cyc)
      
      The cyc on cpu0 was read before the epoch changed. But we
      calculate the nanoseconds based on the new epoch by subtracting
      the new epoch from the old cycle count. Since epoch is most likely
      larger than the old cycle count we calculate a large number that
      will be converted to nanoseconds and added to epoch_ns, causing
      time to jump forward too much.
      
      Fix this problem by reading the hardware after the epoch has
      stabilized.
      
      Cc: Russell King <linux@arm.linux.org.uk>
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      336ae118
  4. 12 Jun, 2013 4 commits
  5. 08 Jun, 2013 1 commit
  6. 06 Jun, 2013 3 commits
  7. 29 May, 2013 4 commits
    • John Stultz's avatar
      x86: Fix vrtc_get_time/set_mmss to use new timespec interface · ce0b0989
      John Stultz authored
      The patch "x86: Increase precision of x86_platform.get/set_wallclock"
      changed the x86 platform set_wallclock/get_wallclock interfaces to
      use nsec granular timespecs instead of a second granular interface.
      
      However, that patch missed converting the vrtc code, so this patch
      converts those functions to use timespecs.
      
      Many thanks to the kbuild test robot for finding this!
      Reported-by: default avatarkbuild test robot <fengguang.wu@intel.com>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      ce0b0989
    • Colin Cross's avatar
      power: Add option to log time spent in suspend · 5c83545f
      Colin Cross authored
      Below is a patch from android kernel that maintains a histogram of
      suspend times. Please review and provide feedback.
      
      Statistices on the time spent in suspend are kept in
      /sys/kernel/debug/sleep_time.
      
      Cc: Android Kernel Team <kernel-team@android.com>
      Cc: Colin Cross <ccross@android.com>
      Cc: Todd Poynor <toddpoynor@google.com>
      Cc: San Mehat <san@google.com>
      Cc: Benoit Goby <benoit@android.com>
      Cc: John Stultz <john.stultz@linaro.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarColin Cross <ccross@android.com>
      Signed-off-by: default avatarTodd Poynor <toddpoynor@google.com>
      [zoran.markovic@linaro.org: Re-formatted suspend time table to better
      fit expected values. Moved accounting of suspend time into timekeeping
      core. Removed CONFIG_SUSPEND_TIME flag and made the feature conditional
      on CONFIG_DEBUG_FS. Changed the file name to sleep_time to better fit
      terminology in timekeeping core. Changed seq_printf to seq_puts. Tweaked
      commit message]
      Signed-off-by: default avatarZoran Markovic <zoran.markovic@linaro.org>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      5c83545f
    • Todd Poynor's avatar
      timerfd: Add alarm timers · 11ffa9d6
      Todd Poynor authored
      Add support for clocks CLOCK_REALTIME_ALARM and CLOCK_BOOTTIME_ALARM,
      thereby enabling wakeup alarm timers via file descriptors.
      Signed-off-by: default avatarTodd Poynor <toddpoynor@google.com>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      11ffa9d6
    • Todd Poynor's avatar
      alarmtimer: Add functions for timerfd support · 6cffe00f
      Todd Poynor authored
      Add functions needed for hooking up alarmtimer to timerfd:
      
      * alarm_restart: Similar to hrtimer_restart, restart an alarmtimer after
        the expires time has already been updated (as with alarm_forward).
      
      * alarm_forward_now: Similar to hrtimer_forward_now, move the expires
        time forward to an interval from the current time of the associated clock.
      
      * alarm_start_relative: Start an alarmtimer with an expires time relative to
        the current time of the associated clock.
      
      * alarm_expires_remaining: Similar to hrtimer_expires_remaining, return the
        amount of time remaining until alarm expiry.
      Signed-off-by: default avatarTodd Poynor <toddpoynor@google.com>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      6cffe00f
  8. 28 May, 2013 7 commits
  9. 16 May, 2013 15 commits
  10. 15 May, 2013 3 commits