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| author | Rui Salvaterra <rsalvaterra@gmail.com> | 2021-08-22 14:50:07 +0100 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2021-08-29 17:03:38 +0200 |
| commit | 7e135add24911a9302d9e73fe0456318ce8169fa (patch) | |
| tree | e21e070b8d90f6d5c01fa8089b134176252220fb /target/linux/generic | |
| parent | b8f8d0651c9ec2a6f4a869fc262d2ba38d723b1f (diff) | |
| download | upstream-7e135add24911a9302d9e73fe0456318ce8169fa.tar.gz upstream-7e135add24911a9302d9e73fe0456318ce8169fa.tar.bz2 upstream-7e135add24911a9302d9e73fe0456318ce8169fa.zip | |
kernel: disable CONFIG_RCU_EXPERT and friends
Based on the existing documentation [1][2], I dare anyone to demonstrate that
we need to fine-tune these RCU parameters. The (performance) breakage potential
for doing so is immense, so let's just please put down this loaded footgun.
Disable CONFIG_RCU_EXPERT and its dependent symbols. Additionally, remove the
CONFIG_RCU_EXPERT symbol from the target kconfigs which contain it.
[1] https://www.kernel.org/doc/Documentation/RCU/Design/Data-Structures/Data-Structures.html
[2] https://lwn.net/Articles/777214/
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Diffstat (limited to 'target/linux/generic')
| -rw-r--r-- | target/linux/generic/config-5.10 | 7 | ||||
| -rw-r--r-- | target/linux/generic/config-5.4 | 6 |
2 files changed, 2 insertions, 11 deletions
diff --git a/target/linux/generic/config-5.10 b/target/linux/generic/config-5.10 index f944f1718f..91f137fbc3 100644 --- a/target/linux/generic/config-5.10 +++ b/target/linux/generic/config-5.10 @@ -4631,12 +4631,8 @@ CONFIG_PWRSEQ_SIMPLE=y CONFIG_RCU_CPU_STALL_TIMEOUT=60 # CONFIG_RCU_EQS_DEBUG is not set # CONFIG_RCU_EXPEDITE_BOOT is not set -CONFIG_RCU_EXPERT=y -CONFIG_RCU_FANOUT=32 -CONFIG_RCU_FANOUT_LEAF=16 -# CONFIG_RCU_FAST_NO_HZ is not set +# CONFIG_RCU_EXPERT is not set CONFIG_RCU_KTHREAD_PRIO=0 -# CONFIG_RCU_NOCB_CPU is not set # CONFIG_RCU_PERF_TEST is not set # CONFIG_RCU_REF_SCALE_TEST is not set # CONFIG_RCU_SCALE_TEST is not set @@ -5995,7 +5991,6 @@ CONFIG_SYSVIPC_SYSCTL=y # CONFIG_TARGET_CORE is not set # CONFIG_TASKSTATS is not set # CONFIG_TASKS_RCU is not set -CONFIG_TASKS_TRACE_RCU_READ_MB=y # CONFIG_TASK_XACCT is not set # CONFIG_TC35815 is not set # CONFIG_TCG_ATMEL is not set diff --git a/target/linux/generic/config-5.4 b/target/linux/generic/config-5.4 index 45d8f0976e..06f5e43a6d 100644 --- a/target/linux/generic/config-5.4 +++ b/target/linux/generic/config-5.4 @@ -4262,12 +4262,8 @@ CONFIG_PWRSEQ_SIMPLE=y CONFIG_RCU_CPU_STALL_TIMEOUT=60 # CONFIG_RCU_EQS_DEBUG is not set # CONFIG_RCU_EXPEDITE_BOOT is not set -CONFIG_RCU_EXPERT=y -CONFIG_RCU_FANOUT=32 -CONFIG_RCU_FANOUT_LEAF=16 -# CONFIG_RCU_FAST_NO_HZ is not set +# CONFIG_RCU_EXPERT is not set CONFIG_RCU_KTHREAD_PRIO=0 -# CONFIG_RCU_NOCB_CPU is not set # CONFIG_RCU_PERF_TEST is not set # CONFIG_RCU_TORTURE_TEST is not set CONFIG_RCU_TORTURE_TEST_SLOW_INIT_DELAY=3 |