If no CPU list is passed, timerlat in user-space will dispatch
one thread per sysconf(_SC_NPROCESSORS_CONF). However, not all
CPU might be available, for instance, if HT is disabled.
Currently, rtla timerlat is stopping the session if an user-space
thread cannot set affinity to a CPU, or if a running user-space
thread is killed. However, this is too restrictive.
So, reduce the error to a debug message, and rtla timerlat run as
long as there is at least one user-space thread alive.
Fixes: cdca4f4e5e8e ("rtla/timerlat_top: Add timerlat user-space support")
Signed-off-by: Daniel Bristot de Oliveira <[email protected]>
---
tools/tracing/rtla/src/timerlat_u.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/tracing/rtla/src/timerlat_u.c b/tools/tracing/rtla/src/timerlat_u.c
index 05e310696dd5..01dbf9a6b5a5 100644
--- a/tools/tracing/rtla/src/timerlat_u.c
+++ b/tools/tracing/rtla/src/timerlat_u.c
@@ -45,7 +45,7 @@ static int timerlat_u_main(int cpu, struct timerlat_u_params *params)
retval = sched_setaffinity(gettid(), sizeof(set), &set);
if (retval == -1) {
- err_msg("Error setting user thread affinity\n");
+ debug_msg("Error setting user thread affinity %d, is the CPU online?\n", cpu);
exit(1);
}
@@ -193,7 +193,9 @@ void *timerlat_u_dispatcher(void *data)
procs_count--;
}
}
- break;
+
+ if (!procs_count)
+ break;
}
sleep(1);
--
2.38.1