I'm trying to find rb_node's structure and I can't find it with ctags or in the http://lxr.linux.no website. How do you search these things out? Ruben On Thu, Apr 09, 2015 at 10:52:03PM -0400, nick wrote: > > > On 2015-04-09 10:12 PM, Ruben Safir wrote: > > 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 yets :) > > > > I'm looking over /home/ruben/linux-3.19.3/Documentation/scheduler > > [ruben@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?? > > > The way that these structures are related is sched_enity is the entity for the task's scheduling > information or the task_struct of the a excuting process to be exact. Furthermore cfs_rq is the > runquenue on which the task is running or selected to run on by schedule,the main scheduling function > of the kernel. Finally here is the function definition for rq_of to answer your question, > static inline struct rq *rq_of(struct cfs_rq *cfs_rq) > { > return cfs_rq->rq; > } > Before asking questions again like this please look into either using lxr or ctags > to navigate the kernel tree for answers as can be faster then waiting for me or > someone else to respond. > Thanks, > Nick > > 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? > > > > > > > > > > > >> 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@xxxxxxxxxxxxxxxxx > >>>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >>>>> > >>>> > >>>> _______________________________________________ > >>>> Kernelnewbies mailing list > >>>> Kernelnewbies@xxxxxxxxxxxxxxxxx > >>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >>>> > >>>> . > >>>> > >>> > >>> > >>> _______________________________________________ > >>> Kernelnewbies mailing list > >>> Kernelnewbies@xxxxxxxxxxxxxxxxx > >>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >>> > >> > >> > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998 http://www.mrbrklyn.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com - Leadership Development in Free Software http://www2.mrbrklyn.com/resources - Unpublished Archive http://www.coinhangout.com - coins! http://www.brooklyn-living.com Being so tracked is for FARM ANIMALS and and extermination camps, but incompatible with living as a free human being. -RI Safir 2013 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
