hc
2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb
kernel/tools/memory-model/Documentation/cheatsheet.txt
....@@ -3,9 +3,9 @@
33 C Self R W RMW Self R W DR DW RMW SV
44 -- ---- - - --- ---- - - -- -- --- --
55
6
-Store, e.g., WRITE_ONCE() Y Y
7
-Load, e.g., READ_ONCE() Y Y Y Y
8
-Unsuccessful RMW operation Y Y Y Y
6
+Relaxed store Y Y
7
+Relaxed load Y Y Y Y
8
+Relaxed RMW operation Y Y Y Y
99 rcu_dereference() Y Y Y Y
1010 Successful *_acquire() R Y Y Y Y Y Y
1111 Successful *_release() C Y Y Y W Y
....@@ -17,14 +17,19 @@
1717 smp_mb__after_atomic() CP a a Y Y Y Y Y Y
1818
1919
20
-Key: C: Ordering is cumulative
21
- P: Ordering propagates
22
- R: Read, for example, READ_ONCE(), or read portion of RMW
23
- W: Write, for example, WRITE_ONCE(), or write portion of RMW
24
- Y: Provides ordering
25
- a: Provides ordering given intervening RMW atomic operation
26
- DR: Dependent read (address dependency)
27
- DW: Dependent write (address, data, or control dependency)
28
- RMW: Atomic read-modify-write operation
29
- SELF: Orders self, as opposed to accesses before and/or after
30
- SV: Orders later accesses to the same variable
20
+Key: Relaxed: A relaxed operation is either READ_ONCE(), WRITE_ONCE(),
21
+ a *_relaxed() RMW operation, an unsuccessful RMW
22
+ operation, a non-value-returning RMW operation such
23
+ as atomic_inc(), or one of the atomic*_read() and
24
+ atomic*_set() family of operations.
25
+ C: Ordering is cumulative
26
+ P: Ordering propagates
27
+ R: Read, for example, READ_ONCE(), or read portion of RMW
28
+ W: Write, for example, WRITE_ONCE(), or write portion of RMW
29
+ Y: Provides ordering
30
+ a: Provides ordering given intervening RMW atomic operation
31
+ DR: Dependent read (address dependency)
32
+ DW: Dependent write (address, data, or control dependency)
33
+ RMW: Atomic read-modify-write operation
34
+ SELF: Orders self, as opposed to accesses before and/or after
35
+ SV: Orders later accesses to the same variable