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Diffstat (limited to 'tools/memory-model/Documentation/cheatsheet.txt')
| -rw-r--r-- | tools/memory-model/Documentation/cheatsheet.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/memory-model/Documentation/cheatsheet.txt b/tools/memory-model/Documentation/cheatsheet.txt new file mode 100644 index 000000000..33ba98d72 --- /dev/null +++ b/tools/memory-model/Documentation/cheatsheet.txt @@ -0,0 +1,30 @@ + Prior Operation Subsequent Operation + --------------- --------------------------- + C Self R W RMW Self R W DR DW RMW SV + -- ---- - - --- ---- - - -- -- --- -- + +Store, e.g., WRITE_ONCE() Y Y +Load, e.g., READ_ONCE() Y Y Y Y +Unsuccessful RMW operation Y Y Y Y +rcu_dereference() Y Y Y Y +Successful *_acquire() R Y Y Y Y Y Y +Successful *_release() C Y Y Y W Y +smp_rmb() Y R Y Y R +smp_wmb() Y W Y Y W +smp_mb() & synchronize_rcu() CP Y Y Y Y Y Y Y Y +Successful full non-void RMW CP Y Y Y Y Y Y Y Y Y Y Y +smp_mb__before_atomic() CP Y Y Y a a a a Y +smp_mb__after_atomic() CP a a Y Y Y Y Y Y + + +Key: C: Ordering is cumulative + P: Ordering propagates + R: Read, for example, READ_ONCE(), or read portion of RMW + W: Write, for example, WRITE_ONCE(), or write portion of RMW + Y: Provides ordering + a: Provides ordering given intervening RMW atomic operation + DR: Dependent read (address dependency) + DW: Dependent write (address, data, or control dependency) + RMW: Atomic read-modify-write operation + SELF: Orders self, as opposed to accesses before and/or after + SV: Orders later accesses to the same variable |