Hi, Here is the 15th version of improvement patches for making persistent ring buffers robust to failures. The previous version is here:
https://lore.kernel.org/all/177487498530.3463592.12715592581212799257.st...@mhiramat.tok.corp.google.com/ This version fixes warning if reader see contiguous multiple empty (invalidated) pages on the recovered persistent ring buffer [2/5], do not show discarded pages if it is 0 [2/5], use pr_warn() for showing test result [4/5], and inject errors to the pages which is multiples of 5 too[4/5]. This also drops "Reset RB_MISSED_* flags" patch, and add a patch to show commit number on each data page [5/5] for debugging. In this version, I added arm64 maitainers to request their review for [1/5], which introduces asm/ring_buffer.h for flushing the cache before reboot. Thank you, --- Masami Hiramatsu (Google) (5): ring-buffer: Flush and stop persistent ring buffer on panic ring-buffer: Skip invalid sub-buffers when validating persistent ring buffer ring-buffer: Skip invalid sub-buffers when rewinding persistent ring buffer ring-buffer: Add persistent ring buffer invalid-page inject test ring-buffer: Show commit numbers in buffer_meta file arch/alpha/include/asm/Kbuild | 1 arch/arc/include/asm/Kbuild | 1 arch/arm/include/asm/Kbuild | 1 arch/arm64/include/asm/ring_buffer.h | 10 + arch/csky/include/asm/Kbuild | 1 arch/hexagon/include/asm/Kbuild | 1 arch/loongarch/include/asm/Kbuild | 1 arch/m68k/include/asm/Kbuild | 1 arch/microblaze/include/asm/Kbuild | 1 arch/mips/include/asm/Kbuild | 1 arch/nios2/include/asm/Kbuild | 1 arch/openrisc/include/asm/Kbuild | 1 arch/parisc/include/asm/Kbuild | 1 arch/powerpc/include/asm/Kbuild | 1 arch/riscv/include/asm/Kbuild | 1 arch/s390/include/asm/Kbuild | 1 arch/sh/include/asm/Kbuild | 1 arch/sparc/include/asm/Kbuild | 1 arch/um/include/asm/Kbuild | 1 arch/x86/include/asm/Kbuild | 1 arch/xtensa/include/asm/Kbuild | 1 include/asm-generic/ring_buffer.h | 13 ++ include/linux/ring_buffer.h | 1 kernel/trace/Kconfig | 31 ++++ kernel/trace/ring_buffer.c | 258 ++++++++++++++++++++++++++-------- kernel/trace/trace.c | 4 + 26 files changed, 273 insertions(+), 64 deletions(-) create mode 100644 arch/arm64/include/asm/ring_buffer.h create mode 100644 include/asm-generic/ring_buffer.h -- Masami Hiramatsu (Google) <[email protected]>
