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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-01-25 15:41:10 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-11 15:51:08 -0700 |
| commit | c69a00a12e26cf4faffdcdb340cb2d059b61d57e (patch) | |
| tree | 348f927f4e0c2ba0ec86e5c7913bd59ef7a7166f /Documentation/admin-guide/kernel-parameters.txt | |
| parent | 0b56f953908a751716f2c8f907942674b60d8db5 (diff) | |
| download | lwn-c69a00a12e26cf4faffdcdb340cb2d059b61d57e.tar.gz lwn-c69a00a12e26cf4faffdcdb340cb2d059b61d57e.zip | |
srcu: Add boot-time control over srcu_node array allocation
This commit adds an srcu_tree.convert_to_big kernel parameter that either
refuses to convert at all (0), converts immediately at init_srcu_struct()
time (1), or lets rcutorture convert it (2). An addition contention-based
dynamic conversion choice will be added, along with documentation.
[ paulmck: Apply callback-scanning feedback from Neeraj Upadhyay. ]
Co-developed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Signed-off-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 3f1cc5e317ed..1f1fcac7777d 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5608,6 +5608,19 @@ off: Disable mitigation and remove performance impact to RDRAND and RDSEED + srcutree.convert_to_big [KNL] + Specifies under what conditions an SRCU tree + srcu_struct structure will be converted to big + form, that is, with an rcu_node tree: + + 0: Never. + 1: At init_srcu_struct() time. + 2: When rcutorture decides to. + + Either way, the srcu_node tree will be sized based + on the actual runtime number of CPUs (nr_cpu_ids) + instead of the compile-time CONFIG_NR_CPUS. + srcutree.counter_wrap_check [KNL] Specifies how frequently to check for grace-period sequence counter wrap for the |