[0/11] RCU update-side scalability update test

Message

Paul E. McKenney Aug. 2, 2024, 12:43 a.m. UTC

Hello!

This series contains updates to RCU's "rcuscale" update-side performance
and scalability test, including a fix of an brown-paper-bag bug:

1.	Save a few lines with whitespace-only change.

2.	Dump stacks of stalled rcu_scale_writer() instances.

3.	Dump grace-period statistics when rcu_scale_writer() stalls.

4.	Mark callbacks not currently participating in barrier operation.

5.	Print detailed grace-period and barrier diagnostics.

6.	Provide clear error when async specified without primitives.

7.	Make all writer tasks report upon hang.

8.	Make rcu_scale_writer() tolerate repeated GFP_KERNEL failure.

9.	Use special allocator for rcu_scale_writer().

10.	NULL out top-level pointers to heap memory.

11.	Count outstanding callbacks per-task rather than per-CPU.

						Thanx, Paul

------------------------------------------------------------------------

 b/kernel/rcu/rcuscale.c |   10 --
 b/kernel/rcu/tree.c     |    3 
 kernel/rcu/rcuscale.c   |  206 +++++++++++++++++++++++++++++++++++++++++++-----
 3 files changed, 191 insertions(+), 28 deletions(-)