is it possible to have the same thing for tasks instead of threads? Il dom 3 gen 2021, 11:31 Philippe Gerum <r...@xenomai.org> ha scritto:
> > steve freyder via Xenomai <xenomai@xenomai.org> writes: > > > Right. > > > > > > AKA, "mode switch", a switch from "primary mode" to "secondary mode", > > or vice versa. > > > > One place you can find that information is in: > > > > /proc/xenomai/sched/acct > > > > there are two fields MSW, and CSW which count mode/context switches > > per-process. This requires an open, a read loop to locate the desired > > pid and extract the desired information, then either rewind or > > close/reopen to do it again - all of which will almost surely generate > > more mode/context switching. > > > > If that helps, there is also the option of getting the thread stats by > program, using int cobalt_thread_stat(pid_t pid, struct > cobalt_threadstat *stat), declared in sys/cobalt.h. pid refers to a > thread identifier (as obtained from gettid(2) in the context of the > target thread). It must refer to a Cobalt thread, otherwise the call > would fail with -ESRCH. > > The mode switch count is present in the returned information block > (->msw). cobalt_thread_stat() would not cause any mode switch. It can be > called by any thread regardless of its type (i.e. regular or Cobalt). > > -- > Philippe. >
