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  1. 16 3月, 2013 3 次提交
    • F
      timekeeping: utilize the suspend-nonstop clocksource to count suspended time · e445cf1c
      由 Feng Tang 提交于 
      There are some new processors whose TSC clocksource won't stop during
suspend. Currently, after system resumes, kernel will use persistent
clock or RTC to compensate the sleep time, but with these nonstop
clocksources, we could skip the special compensation from external
sources, and just use current clocksource for time recounting.

This can solve some time drift bugs caused by some not-so-accurate or
error-prone RTC devices.

The current way to count suspended time is first try to use the persistent
clock, and then try the RTC if persistent clock can't be used. This
patch will change the trying order to:
	suspend-nonstop clocksource -> persistent clock -> RTC

When counting the sleep time with nonstop clocksource, use an accurate way
suggested by Jason Gunthorpe to cover very large delta cycles.
Signed-off-by: NFeng Tang <feng.tang@intel.com>
[jstultz: Small optimization, avoiding re-reading the clocksource]
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      e445cf1c
    • J
      timekeeping: Use inject_offset in warp_clock · 7859e404
      由 John Stultz 提交于 
      When warping the clock (from a local time RTC), use
timekeeping_inject_offset() to atomically add the offset.

This avoids any minor time error caused by the delay between
reading the time, and then setting the adjusted time.
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      7859e404
    • D
      timekeeping: Avoid adjust kernel time once hwclock kept in UTC time · c30bd099
      由 Dong Zhu 提交于 
      If the Hardware Clock kept in local time,kernel will adjust the time
to be UTC time.But if Hardware Clock kept in UTC time,system will make
a dummy settimeofday call first (sys_tz.tz_minuteswest = 0) to make sure
the time is not shifted,so at this point I think maybe it is not necessary
to set the kernel time once the sys_tz.tz_minuteswest is zero.
Signed-off-by: NDong Zhu <bluezhudong@gmail.com>
[jstultz: Updated to merge with conflicting changes ]
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
      c30bd099
  3. 09 3月, 2013 1 次提交
  5. 07 3月, 2013 2 次提交
    • S
      tracing: Do not return EINVAL in snapshot when not allocated · c9960e48
      由 Steven Rostedt (Red Hat) 提交于 
      To use the tracing snapshot feature, writing a '1' into the snapshot
file causes the snapshot buffer to be allocated if it has not already
been allocated and dose a 'swap' with the main buffer, so that the
snapshot now contains what was in the main buffer, and the main buffer
now writes to what was the snapshot buffer.

To free the snapshot buffer, a '0' is written into the snapshot file.

To clear the snapshot buffer, any number but a '0' or '1' is written
into the snapshot file. But if the file is not allocated it returns
-EINVAL error code. This is rather pointless. It is better just to
do nothing and return success.
Acked-by: NHiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      c9960e48
    • S
      tracing: Add help of snapshot feature when snapshot is empty · d8741e2e
      由 Steven Rostedt (Red Hat) 提交于 
      When cat'ing the snapshot file, instead of showing an empty trace
header like the trace file does, show how to use the snapshot
feature.

Also, this is a good place to show if the snapshot has been allocated
or not. Users may want to "pre allocate" the snapshot to have a fast
"swap" of the current buffer. Otherwise, a swap would be slow and might
fail as it would need to allocate the snapshot buffer, and that might
fail under tight memory constraints.

Here's what it looked like before:

 # tracer: nop
 #
 # entries-in-buffer/entries-written: 0/0   #P:4
 #
 #                              _-----=> irqs-off
 #                             / _----=> need-resched
 #                            | / _---=> hardirq/softirq
 #                            || / _--=> preempt-depth
 #                            ||| /     delay
 #           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
 #              | |       |   ||||       |         |

Here's what it looks like now:

 # tracer: nop
 #
 #
 # * Snapshot is freed *
 #
 # Snapshot commands:
 # echo 0 > snapshot : Clears and frees snapshot buffer
 # echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.
 #                      Takes a snapshot of the main buffer.
 # echo 2 > snapshot : Clears snapshot buffer (but does not allocate)
 #                      (Doesn't have to be '2' works with any number that
 #                       is not a '0' or '1')
Acked-by: NHiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      d8741e2e
  7. 03 3月, 2013 2 次提交
    • A
      fix compat_sys_rt_sigprocmask() · db61ec29
      由 Al Viro 提交于 
      Converting bitmask to 32bit granularity is fine, but we'd better
_do_ something with the result.  Such as "copy it to userland"...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      db61ec29
    • J
      trace/ring_buffer: handle 64bit aligned structs · 649508f6
      由 James Hogan 提交于 
      Some 32 bit architectures require 64 bit values to be aligned (for
example Meta which has 64 bit read/write instructions). These require 8
byte alignment of event data too, so use
!CONFIG_HAVE_64BIT_ALIGNED_ACCESS instead of !CONFIG_64BIT ||
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS to decide alignment, and align
buffer_data_page::data accordingly.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org> (previous version subtly different)
      649508f6
  9. 02 3月, 2013 8 次提交
  11. 01 3月, 2013 1 次提交
    • F
      irq: Don't re-enable interrupts at the end of irq_exit · 4cd5d111
      由 Frederic Weisbecker 提交于 
      Commit 74eed016
"irq: Ensure irq_exit() code runs with interrupts disabled"
restore interrupts flags in the end of irq_exit() for archs
that don't define __ARCH_IRQ_EXIT_IRQS_DISABLED.

However always returning from irq_exit() with interrupts
disabled should not be a problem for these archs. Prior to
this commit this was already happening anytime we processed
pending softirqs anyway.
Suggested-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      4cd5d111
  13. 28 2月, 2013 23 次提交