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DATE 2015-04-01

HANGOUT

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Key: Value:

Key: Value:

MESSAGE
DATE 2015-04-09
FROM Ruben Safir
SUBJECT Subject: [NYLXS - HANGOUT] Re: Kernel thread scheduling

On 04/09/2015 10:00 PM, nick wrote:
>
>
> On 2015-04-09 09:51 PM, Ruben Safir wrote:
>>
>> It is passover so I've read over much of this text, but I have to say
>> that in general, I'm way ahead of this book. Although I have limited
>> knowledge of Kernel technology in the specific, the C code, data
>> structs, and programming concepts are spoon feed in this text and its
>> wasting too much time with words that are more easily explained with
>> coding examples and UML charts. I don't need a chapter explaining how
>> to use ps and the basis of Unix architecture. This text is targeted to
>> a different audience, and FWIW, I'm not certain it does a good job of
>> that either. The guys who write these texts fall in love with their own
>> voices. I know, I've suffered this disease myself when I've written
>> tech articles and books.
>>
>> I can''t recommend this book to anyone. Anyone who doesn't understand
>> the basics of I/O processer blocks is not going to understand
>>
>> static void update_curr(struct cfs_rq *cfs_rq)
>>
>>
>> and OTOH void update_curr(struct cfs_rq *cfs_rq) is not explained well
>> enough for coders unfamiliar with the kernel data structs of which BTW
>> struct cfs_rq is not one defined in the text.
>>
>> :(
>>
>> I'm looking for something more like this, but flushed out more as a textbook
>>
>> http://www.ibm.com/developerworks/library/l-completely-fair-scheduler/index.html,
>> and some mentoring, I hope.
>>
>>
>> Ruben
>>
> Ruben,
> The book is for an intro to the kernel not a complete walk through of each subsystem.
> If that is the case,why not read the subsystem code and docs in the kernel. I am a
> novice myself in terms of patch and coding experience but will be glad to explain the
> code as I have read lots of it.


Thank you nick. Yes, I downloaded the entire source from Kernel.org and
it is sitting on both my laptop and in virtual machines where I have
already compiled some stuff and not broken my VMs yet :)

I'm looking over /home/ruben/linux-3.19.3/Documentation/scheduler
[ruben-at-stat13 scheduler]$ ls

00-INDEX sched-deadline.txt sched-rt-group.txt
media=legal -o sides=two-sided-long-edg sched-design-CFS.txt
sched-stats.txt sched-arch.txt sched-domains.txt
sched-bwc.txt sched-nice-design.txt


I also see in the code there is significant documentation.

Right now I am trying to figure out what is the relationship between
struct sched_entity and
struct cfs_rq and
struct rq_of

why do we have both??

there is a cast in update_curr
u64 now = rq_of(cfs_rq)->clock;

or is rq_of a function that returns a pointer is a struct that I missed?


Reuvain


> Nick
>> On 03/22/2015 08:35 PM, nick wrote:
>>>
>>>
>>> On 2015-03-22 08:05 PM, Ruben Safir wrote:
>>>> On 03/22/2015 07:30 PM, nick wrote:
>>>>> I would recommend reading Chapters 3 and 4 of Linux Kernel Development by Robert Love
>>>>> as when I was learning the scheduler and process management
>>>>
>>>>
>>>> how much has the scheduler changed since then. It was completely
>>>> overhauled when the CFS was created
>>>>
>>>>
>>>>
>>> The 3rd edition of this book was written after CFS was in the kernel so the chapters
>>> are pretty up to date.
>>> Nick
>>>> _______________________________________________
>>>> Kernelnewbies mailing list
>>>> Kernelnewbies-at-kernelnewbies.org
>>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>>
>>>
>>> _______________________________________________
>>> Kernelnewbies mailing list
>>> Kernelnewbies-at-kernelnewbies.org
>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>
>>> .
>>>
>>
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies-at-kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>


  1. 2015-04-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] omp pthread madness
  2. 2015-04-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: omp pthread madness
  3. 2015-04-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: omp pthread madness
  4. 2015-04-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: [New discussion] which technologies/skills are good to have
  5. 2015-04-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: omp pthread madness
  6. 2015-04-02 mrbrklyn-at-panix.com Subject: [NYLXS - HANGOUT] [LinuxJournalservices-at-linuxjournalservices.com: Free Geek
  7. 2015-04-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Fw: Perl Developer / Linux SysAdmin Opportunities in South Florida
  8. 2015-04-07 Elfen Magix <elfen_magix-at-yahoo.com> Subject: [NYLXS - HANGOUT] Low Cost or Free Raspberry Pi's?
  9. 2015-04-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Let My People Go
  10. 2015-04-08 Rick Moen <rick-at-linuxmafia.com> Subject: [NYLXS - HANGOUT] (forw) Re: DistroWatch.com: Put the fun back into computing. Use
  11. 2015-04-08 adrba-at-nyct.net Re: [NYLXS - HANGOUT] Let My People Go
  12. 2015-04-08 adrba-at-nyct.net Re: [NYLXS - HANGOUT] JOUNAL MEETING AT 10AM TOMORROW
  13. 2015-04-08 Steven Ovadia <steve.ovadia-at-gmail.com> Subject: [NYLXS - HANGOUT] Explore Privacy Issues at the LACUNY Institute!
  14. 2015-04-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: Kernel thread scheduling
  15. 2015-04-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: Kernel thread scheduling
  16. 2015-04-10 Elfen Magix <elfen_magix-at-yahoo.com> Subject: [NYLXS - HANGOUT] Bulk Raspberry Pi Deal A Failure.
  17. 2015-04-12 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Kernel Hacking Workshop - Focusing on the CFS Scheduler
  18. 2015-04-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Schedule Meetings
  19. 2015-04-13 Robert Menes <viewtiful.icchan-at-gmail.com> Re: [NYLXS - HANGOUT] Schedule Meetings
  20. 2015-04-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Kernel Hacking Resources
  21. 2015-04-14 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Invitation: Vintage Computer Festival
  22. 2015-04-14 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Fwd: Invitation: Vintage Computer Festival
  23. 2015-04-15 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Monday: Join 121 HackerNestologists at "HackerNest NYC April
  24. 2015-04-15 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: Re: Heap Management Problem]
  25. 2015-04-15 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: [HackerNestNYC] Security Info for Monday's HackerNest NYC
  26. 2015-04-15 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Re: [LIU Comp Sci] BASh Shell Scripting
  27. 2015-04-16 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Schedule Meetings
  28. 2015-04-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] linsched
  29. 2015-04-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Re: virtualbox
  30. 2015-04-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Re: Kernel thread scheduling
  31. 2015-04-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Kernel Scheduling Project
  32. 2015-04-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Graduate School goes in circles
  33. 2015-04-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Come Sunday Morning
  34. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: The more I learn the less I know
  35. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] interesting jobs
  36. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] marco typeof and 0
  37. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Summers Here
  38. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Fwd: [NYLXS - HANGOUT] Summers Here
  39. 2015-04-19 Ruben <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Fwd: [NYLXS - HANGOUT] Summers Here
  40. 2015-04-19 Elfen Magix <elfen_magix-at-yahoo.com> Re: [NYLXS - HANGOUT] Summers Here
  41. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Syria and Sarin Gas
  42. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] extract video
  43. 2015-04-19 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Syria and Sarin Gas
  44. 2015-04-20 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] sytemd crimes
  45. 2015-04-20 Ruben <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] OS Homework
  46. 2015-04-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Skinner Box
  47. 2015-04-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Business children and Privacy
  48. 2015-04-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] nukes in NYC
  49. 2015-04-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] nukes in NYC
  50. 2015-04-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Nukes over NYC
  51. 2015-04-24 adrba-at-nyct.net Re: [NYLXS - HANGOUT] Summers Here LET'S
  52. 2015-04-25 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Kernel Scheduling and wait queues
  53. 2015-04-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] While the weather is heating up ...
  54. 2015-04-27 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] While the weather is heating up ...
  55. 2015-04-27 mrbrklyn-at-panix.com Subject: [NYLXS - HANGOUT] [info-at-fsf.org: DMCA exemption commenting process broken beyond
  56. 2015-04-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: Arduino article for next Linux Journal
  57. 2015-04-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] final project - Linux Scheduler
  58. 2015-04-29 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] trolling newsgroupds
  59. 2015-04-30 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] usenet and systemd
  60. 2015-04-30 Elfen Magix <elfen_magix-at-yahoo.com> Subject: [NYLXS - HANGOUT] NYC ROBO Conference

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