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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /tools/memory-model/Documentation/cheatsheet.txt | |
| parent | Initial commit. (diff) | |
| download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip | |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/memory-model/Documentation/cheatsheet.txt')
| -rw-r--r-- | tools/memory-model/Documentation/cheatsheet.txt | 35 |
1 files changed, 35 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..99d00870b --- /dev/null +++ b/tools/memory-model/Documentation/cheatsheet.txt @@ -0,0 +1,35 @@ + Prior Operation Subsequent Operation + --------------- --------------------------- + C Self R W RMW Self R W DR DW RMW SV + -- ---- - - --- ---- - - -- -- --- -- + +Relaxed store Y Y +Relaxed load Y Y Y Y +Relaxed 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: Relaxed: A relaxed operation is either READ_ONCE(), WRITE_ONCE(), + a *_relaxed() RMW operation, an unsuccessful RMW + operation, a non-value-returning RMW operation such + as atomic_inc(), or one of the atomic*_read() and + atomic*_set() family of operations. + 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 |