Re: [gem5-users] [EXT] Accessing logical (software) thread ID in gem5
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 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 >> *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 > > ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] [EXT] Accessing logical (software) thread ID in gem5
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 > *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 ___ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
Re: [gem5-users] [EXT] Accessing logical (software) thread ID in gem5
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 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) mailto: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<mailto:gem5-users-boun...@gem5.org>] On Behalf Of Shehab Elsayed Sent: Thursday, January 10, 2019 11:53 AM To: gem5-users@gem5.org<mailto: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<mailto: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
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
Re: [gem5-users] [EXT] Accessing logical (software) thread ID in gem5
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
