mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2025-04-06 09:13:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

rcu: limit PREEMPT_RCU configurations

Browse Source 
PREEMPT_LAZY can be enabled stand-alone or alongside PREEMPT_DYNAMIC
which allows for dynamic switching of preemption models.

The choice of PREEMPT_RCU or not, however, is fixed at compile time.

Given that PREEMPT_RCU makes some trade-offs to optimize for latency
as opposed to throughput, configurations with limited preemption
might prefer the stronger forward-progress guarantees of PREEMPT_RCU=n.

Accordingly, explicitly limit PREEMPT_RCU=y to the latency oriented
preemption models: PREEMPT, PREEMPT_RT, and the runtime configurable
model PREEMPT_DYNAMIC.

This means the throughput oriented models, PREEMPT_NONE,
PREEMPT_VOLUNTARY, and PREEMPT_LAZY will run with PREEMPT_RCU=n.

Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Ankur Arora 2024-12-12 20:06:58 -08:00 committed by Boqun Feng
parent a56ca5619f
commit 8437bb84bc
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/rcu/Kconfig
View File

@ -18,7 +18,7 @@ config TREE_RCU
config PREEMPT_RCU
bool
default y if PREEMPTION
default y if (PREEMPT || PREEMPT_RT || PREEMPT_DYNAMIC)
select TREE_RCU
help
This option selects the RCU implementation that is