On 2025-06-20 13:20, Gabriele Monaco wrote:
2025-06-18T21:04:30Z Shuah Khan <sk...@linuxfoundation.org>:
On 6/13/25 03:12, Gabriele Monaco wrote:
A task in the kernel (task_mm_cid_work) runs somewhat periodically to
compact the mm_cid for each process. Add a test to validate that it runs
correctly and timely.
The test spawns 1 thread pinned to each CPU, then each thread, including
the main one, runs in short bursts for some time. During this period, the
mm_cids should be spanning all numbers between 0 and nproc.
At the end of this phase, a thread with high enough mm_cid (>= nproc/2)
is selected to be the new leader, all other threads terminate.
After some time, the only running thread should see 0 as mm_cid, if that
doesn't happen, the compaction mechanism didn't work and the test fails.
The test never fails if only 1 core is available, in which case, we
cannot test anything as the only available mm_cid is 0.
Reviewed-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Signed-off-by: Gabriele Monaco <gmon...@redhat.com>
Mathieu,
Let me know if you would like me to take this through my tree.
Acked-by: Shuah Khan <sk...@linuxfoundation.org>
Thanks for the Ack, just to add some context: the test is flaky without the
previous patches, would it still be alright to pull it before them?
We need Peter Zijlstra to act on merging the fix.
Peter ?
Thanks,
Mathieu
Thanks,
Gabriele
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
