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rtla/timerlat: Do not stop user-space if a cpu is offline 

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.

Link: https://lore.kernel.org/lkml/59cf2c882900ab7de91c6ee33b382ac7fa6b4ed0.1694781909.git.bristot@kernel.org

Fixes: cdca4f4e5e ("rtla/timerlat_top: Add timerlat user-space support")
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
This commit is contained in:
Daniel Bristot de Oliveira 2023-09-15 15:02:32 +02:00
parent 301deca09b
commit e8c44d3b71
1 changed files with 4 additions and 2 deletions
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6
tools/tracing/rtla/src/timerlat_u.c
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@ -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);