Hello, Ingo, This pull request contains a single commit that adds a memory model to the tools directory. This memory model can (roughly speaking) be thought of as an automated version of memory-barriers.txt. It is written in the "cat" language, which is executable by the externally provided "herd7" simulator, which exhaustively explores the state space of small litmus tests. This memory model is accompanied by extensive documentation on its use and its design. Two versions have been sent to LKML and feedback incorporated: 1. http://lkml.kernel.org/r/20171113184031.GA26302@xxxxxxxxxxxxxxxxxx 2. http://lkml.kernel.org/r/20180119035855.GA29296@xxxxxxxxxxxxxxxxxx This model has been presented and demoed at a number of Linux gatherings, including the 2016 LinuxCon EU, the 2016 Linux Plumbers Conference, the 2016 Linux Kernel Summit, the 2017 linux.conf.au, and the 2017 Linux Plumbers Conference, which featured a workshop helping a number of Linux kernel hackers install and use the tool. This memory model has matured to the point where it would be good to include it in the Linux kernel, for example, to allow it to track changes as new hardware and use cases are added. We expect the rate of change to be similar to that of Documentation/memory-barriers.txt. This memory model is available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for you to fetch changes up to 1c27b644c0fdbc61e113b8faee14baeb8df32486: Automate memory-barriers.txt; provide Linux-kernel memory model (2018-01-24 20:53:49 -0800) ---------------------------------------------------------------- Paul E. McKenney (1): Automate memory-barriers.txt; provide Linux-kernel memory model tools/memory-model/Documentation/cheatsheet.txt | 30 + tools/memory-model/Documentation/explanation.txt | 1840 ++++++++++++++++++++ tools/memory-model/Documentation/recipes.txt | 570 ++++++ tools/memory-model/Documentation/references.txt | 107 ++ tools/memory-model/MAINTAINERS | 15 + tools/memory-model/README | 220 +++ tools/memory-model/linux-kernel.bell | 53 + tools/memory-model/linux-kernel.cat | 124 ++ tools/memory-model/linux-kernel.cfg | 21 + tools/memory-model/linux-kernel.def | 108 ++ .../litmus-tests/CoRR+poonceonce+Once.litmus | 19 + .../litmus-tests/CoRW+poonceonce+Once.litmus | 18 + .../litmus-tests/CoWR+poonceonce+Once.litmus | 18 + .../litmus-tests/CoWW+poonceonce.litmus | 11 + .../litmus-tests/IRIW+mbonceonces+OnceOnce.litmus | 35 + .../litmus-tests/IRIW+poonceonces+OnceOnce.litmus | 33 + .../litmus-tests/ISA2+poonceonces.litmus | 28 + ...cerelease+poacquirerelease+poacquireonce.litmus | 28 + .../litmus-tests/LB+ctrlonceonce+mbonceonce.litmus | 23 + .../LB+poacquireonce+pooncerelease.litmus | 21 + .../litmus-tests/LB+poonceonces.litmus | 21 + .../litmus-tests/MP+onceassign+derefonce.litmus | 25 + tools/memory-model/litmus-tests/MP+polocks.litmus | 24 + .../litmus-tests/MP+poonceonces.litmus | 20 + .../MP+pooncerelease+poacquireonce.litmus | 20 + .../memory-model/litmus-tests/MP+porevlocks.litmus | 24 + .../litmus-tests/MP+wmbonceonce+rmbonceonce.litmus | 22 + .../memory-model/litmus-tests/R+mbonceonces.litmus | 21 + .../memory-model/litmus-tests/R+poonceonces.litmus | 19 + tools/memory-model/litmus-tests/README | 125 ++ .../memory-model/litmus-tests/S+poonceonces.litmus | 19 + .../S+wmbonceonce+poacquireonce.litmus | 20 + .../litmus-tests/SB+mbonceonces.litmus | 23 + .../litmus-tests/SB+poonceonces.litmus | 21 + .../litmus-tests/WRC+poonceonces+Once.litmus | 27 + .../WRC+pooncerelease+rmbonceonce+Once.litmus | 28 + .../Z6.0+pooncelock+poonceLock+pombonce.litmus | 33 + .../Z6.0+pooncelock+pooncelock+pombonce.litmus | 32 + ...ooncerelease+poacquirerelease+mbonceonce.litmus | 28 + tools/memory-model/lock.cat | 99 ++ 40 files changed, 3973 insertions(+) create mode 100644 tools/memory-model/Documentation/cheatsheet.txt create mode 100644 tools/memory-model/Documentation/explanation.txt create mode 100644 tools/memory-model/Documentation/recipes.txt create mode 100644 tools/memory-model/Documentation/references.txt create mode 100644 tools/memory-model/MAINTAINERS create mode 100644 tools/memory-model/README create mode 100644 tools/memory-model/linux-kernel.bell create mode 100644 tools/memory-model/linux-kernel.cat create mode 100644 tools/memory-model/linux-kernel.cfg create mode 100644 tools/memory-model/linux-kernel.def create mode 100644 tools/memory-model/litmus-tests/CoRR+poonceonce+Once.litmus create mode 100644 tools/memory-model/litmus-tests/CoRW+poonceonce+Once.litmus create mode 100644 tools/memory-model/litmus-tests/CoWR+poonceonce+Once.litmus create mode 100644 tools/memory-model/litmus-tests/CoWW+poonceonce.litmus create mode 100644 tools/memory-model/litmus-tests/IRIW+mbonceonces+OnceOnce.litmus create mode 100644 tools/memory-model/litmus-tests/IRIW+poonceonces+OnceOnce.litmus create mode 100644 tools/memory-model/litmus-tests/ISA2+poonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/ISA2+pooncerelease+poacquirerelease+poacquireonce.litmus create mode 100644 tools/memory-model/litmus-tests/LB+ctrlonceonce+mbonceonce.litmus create mode 100644 tools/memory-model/litmus-tests/LB+poacquireonce+pooncerelease.litmus create mode 100644 tools/memory-model/litmus-tests/LB+poonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/MP+onceassign+derefonce.litmus create mode 100644 tools/memory-model/litmus-tests/MP+polocks.litmus create mode 100644 tools/memory-model/litmus-tests/MP+poonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/MP+pooncerelease+poacquireonce.litmus create mode 100644 tools/memory-model/litmus-tests/MP+porevlocks.litmus create mode 100644 tools/memory-model/litmus-tests/MP+wmbonceonce+rmbonceonce.litmus create mode 100644 tools/memory-model/litmus-tests/R+mbonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/R+poonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/README create mode 100644 tools/memory-model/litmus-tests/S+poonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/S+wmbonceonce+poacquireonce.litmus create mode 100644 tools/memory-model/litmus-tests/SB+mbonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/SB+poonceonces.litmus create mode 100644 tools/memory-model/litmus-tests/WRC+poonceonces+Once.litmus create mode 100644 tools/memory-model/litmus-tests/WRC+pooncerelease+rmbonceonce+Once.litmus create mode 100644 tools/memory-model/litmus-tests/Z6.0+pooncelock+poonceLock+pombonce.litmus create mode 100644 tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus create mode 100644 tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+mbonceonce.litmus create mode 100644 tools/memory-model/lock.cat
