This set is a prototype that allows dynamic kernel text (modules, bpf programs, various trampolines, etc.) to share huge pages. The idea is similar to Peter's suggestion in [1]. Please refer to each patch for more detais. The ultimate goal is to only host kernel text in 2MB pages (for x86_64). Please share your comments on this. Thanks! [1] https://lore.kernel.org/bpf/Ys6cWUMHO8XwyYgr@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ Song Liu (5): vmalloc: introduce vmalloc_exec and vfree_exec bpf: use vmalloc_exec modules, x86: use vmalloc_exec for module core vmalloc_exec: share a huge page with kernel text vmalloc: vfree_exec: free unused vm_struct arch/x86/Kconfig | 1 + arch/x86/kernel/alternative.c | 30 ++++- arch/x86/kernel/module.c | 1 + arch/x86/mm/init_64.c | 3 +- include/linux/vmalloc.h | 16 +-- kernel/bpf/core.c | 155 ++------------------------ kernel/module/main.c | 23 ++-- kernel/module/strict_rwx.c | 3 - kernel/trace/ftrace.c | 3 +- mm/nommu.c | 7 ++ mm/vmalloc.c | 200 +++++++++++++++++++++++++++++----- 11 files changed, 239 insertions(+), 203 deletions(-) -- 2.30.2
