UPDATE: If I call curTaskPIDFromTaskStruct() instead of curTaskPID() both kernels give the same error of "panic: vtophys page walk returned fault"
On Mon, Jan 14, 2019 at 12:19 PM Shehab Elsayed <shehaby...@gmail.com> wrote: > So, I tried adding this patch to kernels 4.3 and 4.8.13. Both kernels > compile successfully but then I run into problems in gem5. Here is what > happens: > > 1- Kernel 4.3: > When curThreadInfo() gets called on a context switch it gives this error > "panic:curThreadInfo() not implemented for this ISA" > > 2- Kernel 4.8.13: > When curTaskPID() gets called on a context switch it gives this error > "panic: vtophys page walk returned fault" > > Also, I don't think I mentioned this before. I am running full system > simulation with X86 cores. > > > On Sat, Jan 12, 2019 at 12:17 PM Paul Rosenfeld (prosenfeld) < > prosenf...@micron.com> wrote: > >> You’ll need to build a kernel with the extra annotations. I’m not sure if >> they are supported in the latest kernels but I know it was supported in >> v4.3. Here is the commit that adds those symbols: >> https://github.com/gem5/linux-arm-gem5-legacy/commit/516ba2d255b502b1dad07662bd18110f3bf37b1b >> >> >> >> *From:* gem5-users [mailto:gem5-users-boun...@gem5.org] *On Behalf Of *Shehab >> Elsayed >> *Sent:* Friday, January 11, 2019 10:58 PM >> *To:* gem5 users mailing list <gem5-users@gem5.org> >> *Subject:* Re: [gem5-users] [EXT] Accessing logical (software) thread ID >> in gem5 >> >> >> >> Thank you all for your help. I have been trying to to get what Paul >> suggested to work, however, I keep running into this problem: >> >> >> >> warn: Unable to find kernel symbol thread_info_task >> warn: Kernel not compiled with task_struct info; can't get currently >> executing task/process/thread name/ids! >> >> >> >> I am not sure what I need to modify in the kernel in order to get it to >> work. Any suggestions? >> >> >> >> On Fri, Jan 11, 2019 at 9:27 AM Paul Rosenfeld (prosenfeld) < >> prosenf...@micron.com> wrote: >> >> You could take the approach previously implemented by ARM, which is to >> add a few annotations to your kernel that allow you to find the task_info >> structures in kernel memory and then ask gem5 to hook the kernel process >> switch function. Each time the kernel context switches on a core, you get a >> callback into gem5 and you can look up the process info. It’s been a while >> since I’ve worked on this sort of thing but you might be able to look at >> this patch for some hints about where to look: >> >> >> >> https://gem5-review.googlesource.com/c/public/gem5/+/2640 >> >> >> >> >> >> Cheeers, >> >> Paul >> >> >> >> *From:* gem5-users [mailto:gem5-users-boun...@gem5.org] *On Behalf Of *Shehab >> Elsayed >> *Sent:* Thursday, January 10, 2019 11:53 AM >> *To:* gem5-users@gem5.org >> *Subject:* [EXT] [gem5-users] Accessing logical (software) thread ID in >> gem5 >> >> >> >> Hello All, >> >> >> >> I was wondering if there is a way to differentiate between different >> logical (software) threads in gem5. I am trying to collect some stats for >> each logical thread and so far all I could find in gem5 is access to >> physical threads. I know that logical threads is the responsibility of the >> OS but is there anyway for gem5 to access the logical thread ID. >> >> >> >> One option is to pin threads to cores but this only works if the number >> of cores is at least equal to the number of logical threads. However, I >> will need to run some experiments where the number of logical threads >> exceed the number of cores, in which case, multiple logical threads will be >> assigned to the same core and in order to differentiate between them I need >> the logical thread ID. >> >> >> >> Thank you very much in advance. >> >> >> >> Best Regards, >> >> Shehab >> >> _______________________________________________ >> gem5-users mailing list >> gem5-users@gem5.org >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> >> _______________________________________________ >> gem5-users mailing list >> gem5-users@gem5.org >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > >
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