linux-kernel - [PATCH RFC v2 00/12] Cyclic Scheduler Against RTC

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Date:	Sun, 17 Apr 2016 23:23:29 -0700
From:	"Bill Huey (hui)" <bill.huey@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-kernel@...r.kernel.org
Cc:	luca abeni <luca.abeni@...tn.it>, Juri Lelli <juri.lelli@....com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH RFC v2 00/12] Cyclic Scheduler Against RTC

64/32bit architecture related changes. Change for m68k architecture
compilation problems.

Need to mask out the lower 4 bits of the hash inserts itself into the
rbtree, better statistical reporting of overrun events, more procfs
support for setting the interrupt source, yield testing and backwards
compatible testing next.

bill

---

Sample output from the test program. The delay in the userspace program
is constant but the time frame interval is reduced in half for each row.
It only tests periodic interrupts for now. Note that the number of events
reported increases the frame interval is reduced.

'Slots' shows the frame bit pattern.


billh@...hine:~$ (cd bwi && sudo ./rtctest) 2>&1 | tee out

                        RTC Driver Test Example.


Periodic IRQ rate is 64Hz.
Counting 20 interrupts at:
2Hz:    .1 0x0001,.2 0x0001,.3 0x0001,.4 0x0001,.5 0x0001,
4Hz:    .1 0x0000,.2 0x0001,.3 0x0000,.4 0x0001,.5 0x0000,
8Hz:    .1 0x0001,.2 0x0001,.3 0x0000,.4 0x0001,.5 0x0001,
16Hz:   .1 0x0001,.2 0x0002,.3 0x0002,.4 0x0001,.5 0x0002,
32Hz:   .1 0x0003,.2 0x0003,.3 0x0003,.4 0x0003,.5 0x0003,
64Hz:   .1 0x0007,.2 0x0006,.3 0x0006,.4 0x0007,.5 0x0006,

                         *** Test complete ***

created thread 0
        thread id = 0
slots = 0x9249249249249249

created thread 1
        thread id = 1
slots = 0x4924924924924924

created thread 2
        thread id = 2
slots = 0x2492492492492492
tid 0, 0x0056
        thread exited running SCHED_RR = 0
tid 2, 0x0057
        thread exited running SCHED_RR = 2
tid 1, 0x0052
        thread exited running SCHED_RR = 1
pthread done
billh@...hine:~$ 

---

Bill Huey (hui) (12):
  Kconfig change
  Reroute rtc update irqs to the cyclic scheduler handler
  Add cyclic support to rtc-dev.c
  Anonymous struct initialization
  Task tracking per file descriptor
  Add anonymous struct to sched_rt_entity
  kernel/userspace additions for addition ioctl() support for rtc
  Compilation support
  Add priority support for the cyclic scheduler
  Export SCHED_FIFO/RT requeuing functions
  Cyclic scheduler support
  Cyclic/rtc documentation

 Documentation/scheduler/sched-cyclic-rtc.txt | 468 ++++++++++++++++++++
 drivers/rtc/Kconfig                          |   5 +
 drivers/rtc/class.c                          |   3 +
 drivers/rtc/interface.c                      |  23 +
 drivers/rtc/rtc-dev.c                        | 167 ++++++++
 include/linux/init_task.h                    |  18 +
 include/linux/rtc.h                          |   3 +
 include/linux/sched.h                        |  15 +
 include/uapi/linux/rtc.h                     |   4 +
 kernel/sched/Makefile                        |   1 +
 kernel/sched/core.c                          |  13 +
 kernel/sched/cyclic.c                        | 612 +++++++++++++++++++++++++++
 kernel/sched/cyclic.h                        |  86 ++++
 kernel/sched/cyclic_rt.h                     |   7 +
 kernel/sched/rt.c                            |  41 ++
 15 files changed, 1466 insertions(+)
 create mode 100644 Documentation/scheduler/sched-cyclic-rtc.txt
 create mode 100644 kernel/sched/cyclic.c
 create mode 100644 kernel/sched/cyclic.h
 create mode 100644 kernel/sched/cyclic_rt.h

-- 
2.5.0