* [Xenomai-help] accessing context switch counter from rttask @ 2007-06-26 15:01 ` Gsellmann Peter 2007-06-26 15:39 ` Jan Kiszka 0 siblings, 1 reply; 3+ messages in thread From: Gsellmann Peter @ 2007-06-26 15:01 UTC (permalink / raw) To: xenomai Hi! I searched for a while and found this snippet RT_TASK *rt = rt_task_self(); int x = rt->thread_base.stat.csw; should give the number of context switches, but: RT_TASK in non-kernel mode is only RT_TASK_PLACEHOLDER so i have no access to thread_base! Is there an official way to get this info (w/o opening "/proc/xenomai/...")? TIA, Peter ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Xenomai-help] accessing context switch counter from rttask @ 2007-06-26 15:01 ` Gsellmann Peter 2007-06-26 15:39 ` Jan Kiszka 0 siblings, 1 reply; 3+ messages in thread From: Gsellmann Peter @ 2007-06-26 15:01 UTC (permalink / raw) To: xenomai Hi! I searched for a while and found this snippet RT_TASK *rt = rt_task_self(); int x = rt->thread_base.stat.csw; should give the number of context switches, but: RT_TASK in non-kernel mode is only RT_TASK_PLACEHOLDER so i have no access to thread_base! Is there an official way to get this info (w/o opening "/proc/xenomai/...")? TIA, Peter ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xenomai-help] accessing context switch counter from rttask 2007-06-26 15:01 ` Gsellmann Peter @ 2007-06-26 15:39 ` Jan Kiszka 2007-07-08 12:00 ` Jan Kiszka 0 siblings, 1 reply; 3+ messages in thread From: Jan Kiszka @ 2007-06-26 15:39 UTC (permalink / raw) To: Gsellmann Peter; +Cc: xenomai [-- Attachment #1: Type: text/plain, Size: 666 bytes --] Gsellmann Peter wrote: > Hi! > > I searched for a while and found this snippet > > RT_TASK *rt = rt_task_self(); > int x = rt->thread_base.stat.csw; > > should give the number of context switches, but: > RT_TASK in non-kernel mode is only RT_TASK_PLACEHOLDER so i have no > access to thread_base! > > Is there an official way to get this info (w/o opening > "/proc/xenomai/...")? > Not yet. You could extend RT_TASK_INFO with this statistic (obtained via rt_task_inquire). There is currently work in progress to add accumulated execution times to the same interface, so this extension would fit quite well. Patches always welcome. Jan [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 250 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xenomai-help] accessing context switch counter from rttask 2007-06-26 15:39 ` Jan Kiszka @ 2007-07-08 12:00 ` Jan Kiszka 0 siblings, 0 replies; 3+ messages in thread From: Jan Kiszka @ 2007-07-08 12:00 UTC (permalink / raw) To: Gsellmann Peter; +Cc: xenomai [-- Attachment #1: Type: text/plain, Size: 1156 bytes --] Jan Kiszka wrote: > Gsellmann Peter wrote: >> Hi! >> >> I searched for a while and found this snippet >> >> RT_TASK *rt = rt_task_self(); >> int x = rt->thread_base.stat.csw; >> >> should give the number of context switches, but: >> RT_TASK in non-kernel mode is only RT_TASK_PLACEHOLDER so i have no >> access to thread_base! >> >> Is there an official way to get this info (w/o opening >> "/proc/xenomai/...")? >> > > Not yet. You could extend RT_TASK_INFO with this statistic (obtained via > rt_task_inquire). There is currently work in progress to add accumulated > execution times to the same interface, so this extension would fit quite > well. Patches always welcome. Meanwhile, I added this feature to my experimental patch stack while integrating some other new stats. See http://www.rts.uni-hannover.de/rtaddon/patches/xenomai/ against Xenomai SVN trunk, namely http://www.rts.uni-hannover.de/rtaddon/patches/xenomai/enhance-thread-stats.patch Just call rt_task_inquire() and check RT_TASK_INFO::ctxswitches (there are modeswitches and pagefaults too as we are already at it). Feedback welcome! Jan [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 250 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2007-07-08 12:00 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2007-06-26 15:01 [Xenomai-help] accessing context switch counter from rttask Gsellmann Peter 2007-06-26 15:01 ` Gsellmann Peter 2007-06-26 15:39 ` Jan Kiszka 2007-07-08 12:00 ` Jan Kiszka
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