Messages in this thread Patch in this message | | | From | Tony Luck <> | Subject | [PATCH] Documentation/x86: Update split lock documentation | Date | Wed, 15 Mar 2023 15:57:22 -0700 |
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commit b041b525dab9 ("x86/split_lock: Make life miserable for split lockers") added a delay and serialization of cplit locks. Commit 727209376f49 ("x86/split_lock: Add sysctl to control the misery mode") provided a sysctl to turn off the misery.
Update the split lock documentation to describe the current state of the code.
Signed-off-by: Tony Luck <tony.luck@intel.com> --- Documentation/x86/buslock.rst | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/Documentation/x86/buslock.rst b/Documentation/x86/buslock.rst index 7c051e714943..31ec0ef78086 100644 --- a/Documentation/x86/buslock.rst +++ b/Documentation/x86/buslock.rst @@ -53,8 +53,14 @@ parameter "split_lock_detect". Here is a summary of different options: |off |Do nothing |Do nothing | +------------------+----------------------------+-----------------------+ |warn |Kernel OOPs |Warn once per task and | -|(default) |Warn once per task and |and continues to run. | -| |disable future checking | | +|(default) |Warn once per task, add a |and continues to run. | +| |delay, add synchronization | | +| |to prevent more than one | | +| |core from executing a | | +| |split lock in parallel. | | +| |sysctl split_lock_mitigate | | +| |can be used to avoid the | | +| |delay and synchronization | | | |When both features are | | | |supported, warn in #AC | | +------------------+----------------------------+-----------------------+ -- 2.39.2
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