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Date: Thu, 1 Jun 2023 13:12:44 +0300 From: Mike Rapoport <rppt@...nel.org> To: linux-kernel@...r.kernel.org Cc: Andrew Morton <akpm@...ux-foundation.org>, Catalin Marinas <catalin.marinas@....com>, Christophe Leroy <christophe.leroy@...roup.eu>, "David S. Miller" <davem@...emloft.net>, Dinh Nguyen <dinguyen@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>, Helge Deller <deller@....de>, Huacai Chen <chenhuacai@...nel.org>, Kent Overstreet <kent.overstreet@...ux.dev>, Luis Chamberlain <mcgrof@...nel.org>, Michael Ellerman <mpe@...erman.id.au>, Mike Rapoport <rppt@...nel.org>, "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>, Palmer Dabbelt <palmer@...belt.com>, Russell King <linux@...linux.org.uk>, Song Liu <song@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Thomas Gleixner <tglx@...utronix.de>, Will Deacon <will@...nel.org>, bpf@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org, linux-mm@...ck.org, linux-modules@...r.kernel.org, linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev, netdev@...r.kernel.org, sparclinux@...r.kernel.org, x86@...nel.org Subject: [PATCH 00/13] mm: jit/text allocator From: "Mike Rapoport (IBM)" <rppt@...nel.org> Hi, module_alloc() is used everywhere as a mean to allocate memory for code. Beside being semantically wrong, this unnecessarily ties all subsystmes that need to allocate code, such as ftrace, kprobes and BPF to modules and puts the burden of code allocation to the modules code. Several architectures override module_alloc() because of various constraints where the executable memory can be located and this causes additional obstacles for improvements of code allocation. This set splits code allocation from modules by introducing jit_text_alloc(), jit_data_alloc() and jit_free() APIs, replaces call sites of module_alloc() and module_memfree() with the new APIs and implements core text and related allocation in a central place. Instead of architecture specific overrides for module_alloc(), the architectures that require non-default behaviour for text allocation must fill jit_alloc_params structure and implement jit_alloc_arch_params() that returns a pointer to that structure. If an architecture does not implement jit_alloc_arch_params(), the defaults compatible with the current modules::module_alloc() are used. The new jitalloc infrastructure allows decoupling of kprobes and ftrace from modules, and most importantly it enables ROX allocations for executable memory. A centralized infrastructure for code allocation allows future optimizations for allocations of executable memory, caching large pages for better iTLB performance and providing sub-page allocations for users that only need small jit code snippets. patches 1-5: split out the code allocation from modules and arch patch 6: add dedicated API for data allocations with constraints similar to code allocations patches 7-9: decouple dynamic ftrace and kprobes form CONFIG_MODULES patches 10-13: enable ROX allocations for executable memory on x86 Mike Rapoport (IBM) (11): nios2: define virtual address space for modules mm: introduce jit_text_alloc() and use it instead of module_alloc() mm/jitalloc, arch: convert simple overrides of module_alloc to jitalloc mm/jitalloc, arch: convert remaining overrides of module_alloc to jitalloc module, jitalloc: drop module_alloc mm/jitalloc: introduce jit_data_alloc() x86/ftrace: enable dynamic ftrace without CONFIG_MODULES arch: make jitalloc setup available regardless of CONFIG_MODULES kprobes: remove dependcy on CONFIG_MODULES modules, jitalloc: prepare to allocate executable memory as ROX x86/jitalloc: make memory allocated for code ROX Song Liu (2): ftrace: Add swap_func to ftrace_process_locs() x86/jitalloc: prepare to allocate exectuatble memory as ROX arch/Kconfig | 5 +- arch/arm/kernel/module.c | 32 ------ arch/arm/mm/init.c | 35 ++++++ arch/arm64/kernel/module.c | 47 -------- arch/arm64/mm/init.c | 42 +++++++ arch/loongarch/kernel/module.c | 6 - arch/loongarch/mm/init.c | 16 +++ arch/mips/kernel/module.c | 9 -- arch/mips/mm/init.c | 19 ++++ arch/nios2/include/asm/pgtable.h | 5 +- arch/nios2/kernel/module.c | 24 ++-- arch/parisc/kernel/module.c | 11 -- arch/parisc/mm/init.c | 21 +++- arch/powerpc/kernel/kprobes.c | 4 +- arch/powerpc/kernel/module.c | 37 ------- arch/powerpc/mm/mem.c | 41 +++++++ arch/riscv/kernel/module.c | 10 -- arch/riscv/mm/init.c | 18 +++ arch/s390/kernel/ftrace.c | 4 +- arch/s390/kernel/kprobes.c | 4 +- arch/s390/kernel/module.c | 46 +------- arch/s390/mm/init.c | 35 ++++++ arch/sparc/kernel/module.c | 34 +----- arch/sparc/mm/Makefile | 2 + arch/sparc/mm/jitalloc.c | 21 ++++ arch/sparc/net/bpf_jit_comp_32.c | 8 +- arch/x86/Kconfig | 2 + arch/x86/kernel/alternative.c | 43 ++++--- arch/x86/kernel/ftrace.c | 59 +++++----- arch/x86/kernel/kprobes/core.c | 4 +- arch/x86/kernel/module.c | 75 +------------ arch/x86/kernel/static_call.c | 10 +- arch/x86/kernel/unwind_orc.c | 13 ++- arch/x86/mm/init.c | 52 +++++++++ arch/x86/net/bpf_jit_comp.c | 22 +++- include/linux/ftrace.h | 2 + include/linux/jitalloc.h | 69 ++++++++++++ include/linux/moduleloader.h | 15 --- kernel/bpf/core.c | 14 +-- kernel/kprobes.c | 51 +++++---- kernel/module/Kconfig | 1 + kernel/module/main.c | 56 ++++------ kernel/trace/ftrace.c | 13 ++- kernel/trace/trace_kprobe.c | 11 ++ mm/Kconfig | 3 + mm/Makefile | 1 + mm/jitalloc.c | 185 +++++++++++++++++++++++++++++++ mm/mm_init.c | 2 + 48 files changed, 777 insertions(+), 462 deletions(-) create mode 100644 arch/sparc/mm/jitalloc.c create mode 100644 include/linux/jitalloc.h create mode 100644 mm/jitalloc.c base-commit: 44c026a73be8038f03dbdeef028b642880cf1511 -- 2.35.1
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