On Wed, Aug 6, 2014 at 6:23 PM, Venkatram Tummala <venkatram867@xxxxxxxxx> wrote: > On 08/06/2014 03:11 PM, Nick Krause wrote: >> I am new to kernel programming and have a lot questions about this >> structure. Also if after you guys reply I have a few \ >> questions for Greg Kroah Hartman about usb development and stable >> trees. I am very excited about learning this properly >> now and if anyone notices something wrong in my understanding please >> let me known :). >> Thanks So Much, >> Nick >> Questions about task_struct >> 1.volatile long state; Is this line like jiffies for timers with >> regards to the keyword volatile? >> 2.void *stack; Is this a pointer to the kernel stack for the process >> related to the process >> that the structure is keeping data for and is void to make it an >> opaque data type? Is this >> normally an int or some other data type when called with most processes? >> 3.unsigned int flags; /* per process flags, defined below */, My only >> question about this is >> what flags are there and are these the ifdef statements in the struct? >> 4.Why are we making the usage count atomic?(pretty obvious but real >> world reasons would be great) >> 5.I assume int ptrace is for ptrace or debugged processes? If I wrong >> please let me known too. >> 6. What is wakkee_flips and wakkee_flips_decay used for? >> 7.This is probably a stupid question but are these the scheduler cases for CFS? >> 1240 int on_rq; >> 1241 >> 1242 int prio, static_prio, normal_prio; >> 1243 unsigned int rt_priority; >> 1244 const struct sched_class *sched_class; >> 1245 struct sched_entity se; >> 1246 struct sched_rt_entity rt; >> 1247 #ifdef CONFIG_CGROUP_SCHED >> 1248 struct task_group *sched_task_group; >> 1249 #endif >> 1250 struct sched_dl_entity dl; >> 8.What are preempt notifiers and what are they for?(another stupid question) >> 9. Are these lines for the policy used and to block certain processes >> to only a few processors? >> 1261 unsigned int policy; >> 1262 int nr_cpus_allowed; >> 1263 cpumask_t cpus_allowed; >> 8.What are the options like CONFIG_PREEMPT_RCU used for in terms of >> workloads or locking as I heard a lot about >> them on the threads on the lkml? > > Go learn C first. > > BTW, We all know that you were here on the mailing list before with the > name "James Bond". Now, its Nick Krause. You have irritated many guys > before this. Unfortunately, changing the name wont change the attitude. > > I am pretty sure you will come back with a different name now. > > Dude, seriously. Stop it.! > >> >> P.S. Sorry about some many questions,. Answer then whenever you guys >> have time and if there stupid and easily found >> somewhere let me known. >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies No I not coming back with another name, I would like my questions answered first. Nick _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
