An Error occurs when run: ./cyclictest -v -t 5 -p 80 -i 1000 -a 3
parse_cpumask: Using 0 cpus.
Max CPUs = 96
WARN: Couldn't setaffinity in main thread: Invalid argument
# /dev/cpu_dma_latency set to 0us
FATAL: No allowable cpus to run on
We find that numa_bitmask_alloc() is used incorrectly in
use_current_cpuset(), it should pass the number of cpus as parameters,
not the sizeof(struct bitmask), which is only 8 bytes.
The syscall sched_getaffinity will check the parameters, if using
sizeof(struct bitmask), it will fail when cpus is more:
SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
unsigned long __user *, user_mask_ptr)
{
int ret;
cpumask_var_t mask;
if ((len * BITS_PER_BYTE) < nr_cpu_ids)
return -EINVAL;
Fix it by passing max_cpus as parameters to numa_bitmask_alloc().
Signed-off-by: Yunfeng Ye <yeyunfeng@xxxxxxxxxx>
---
src/cyclictest/cyclictest.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index c5f1fd46567a..989113fb3483 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -1135,7 +1135,7 @@ static void use_current_cpuset(const int max_cpus)
pid = getpid();
- curmask = numa_bitmask_alloc(sizeof(struct bitmask));
+ curmask = numa_bitmask_alloc(max_cpus);
numa_sched_getaffinity(pid, curmask);
/* Clear bits that are not set in both the cpuset from the environment,
--
1.8.3.1
