From: Nico Pache npache@redhat.com

Redhat: enable Kfence on production servers

Kfence allows for a low overhead memory error detection system that can be deployed in production. By enabling this feature we allow for better and quicker bug reporting/fixing.

the Kscale team has done some performance testing and have concluded there is no noticable performance impact.

Enable for ELN and remove the Fedora specific config definition. We may want to consider enabling CONFIG_KFENCE_DEFERRABLE on fedora... This config allows the CPU wakup to be deferred, which is more ideal for power-constrianted systems which is more likely to be the case on Fedora.

Signed-off-by: Nico Pache npache@redhat.com

diff --git a/redhat/configs/common/debug/CONFIG_KFENCE b/redhat/configs/common/debug/CONFIG_KFENCE new file mode 100644 index blahblah..blahblah 100644 --- /dev/null +++ b/redhat/configs/common/debug/CONFIG_KFENCE @@ -0,0 +1 @@ +# CONFIG_KFENCE is not set diff --git a/redhat/configs/common/generic/CONFIG_KFENCE b/redhat/configs/common/generic/CONFIG_KFENCE index blahblah..blahblah 100644 --- a/redhat/configs/common/generic/CONFIG_KFENCE +++ b/redhat/configs/common/generic/CONFIG_KFENCE @@ -1 +1 @@ -# CONFIG_KFENCE is not set +CONFIG_KFENCE=y diff --git a/redhat/configs/common/generic/CONFIG_KFENCE_DEFERRABLE b/redhat/configs/common/generic/CONFIG_KFENCE_DEFERRABLE new file mode 100644 index blahblah..blahblah 100644 --- /dev/null +++ b/redhat/configs/common/generic/CONFIG_KFENCE_DEFERRABLE @@ -0,0 +1 @@ +# CONFIG_KFENCE_DEFERRABLE is not set diff --git a/redhat/configs/fedora/generic/CONFIG_KFENCE_NUM_OBJECTS b/redhat/configs/common/generic/CONFIG_KFENCE_NUM_OBJECTS rename from redhat/configs/fedora/generic/CONFIG_KFENCE_NUM_OBJECTS rename to redhat/configs/common/generic/CONFIG_KFENCE_NUM_OBJECTS index blahblah..blahblah 100644 --- a/redhat/configs/fedora/generic/CONFIG_KFENCE_NUM_OBJECTS +++ b/redhat/configs/common/generic/CONFIG_KFENCE_NUM_OBJECTS diff --git a/redhat/configs/common/generic/CONFIG_KFENCE_SAMPLE_INTERVAL b/redhat/configs/common/generic/CONFIG_KFENCE_SAMPLE_INTERVAL new file mode 100644 index blahblah..blahblah 100644 --- /dev/null +++ b/redhat/configs/common/generic/CONFIG_KFENCE_SAMPLE_INTERVAL @@ -0,0 +1 @@ +CONFIG_KFENCE_SAMPLE_INTERVAL=100 diff --git a/redhat/configs/common/generic/CONFIG_KFENCE_STATIC_KEYS b/redhat/configs/common/generic/CONFIG_KFENCE_STATIC_KEYS new file mode 100644 index blahblah..blahblah 100644 --- /dev/null +++ b/redhat/configs/common/generic/CONFIG_KFENCE_STATIC_KEYS @@ -0,0 +1 @@ +CONFIG_KFENCE_STATIC_KEYS=y diff --git a/redhat/configs/fedora/generic/CONFIG_KFENCE b/redhat/configs/fedora/generic/CONFIG_KFENCE deleted file mode 100644 index blahblah..blahblah 0 --- a/redhat/configs/fedora/generic/CONFIG_KFENCE +++ /dev/null @@ -1 +0,0 @@ -CONFIG_KFENCE=y diff --git a/redhat/configs/fedora/generic/CONFIG_KFENCE_SAMPLE_INTERVAL b/redhat/configs/fedora/generic/CONFIG_KFENCE_SAMPLE_INTERVAL deleted file mode 100644 index blahblah..blahblah 0 --- a/redhat/configs/fedora/generic/CONFIG_KFENCE_SAMPLE_INTERVAL +++ /dev/null @@ -1 +0,0 @@ -CONFIG_KFENCE_SAMPLE_INTERVAL=0

-- https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1748