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| author | Paul E. McKenney <paulmck@kernel.org> | 2020-08-04 11:35:56 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-09-04 11:58:15 -0700 |
| commit | 0ce0c78eff7d22c8a261de6c4305a5abb638c200 (patch) | |
| tree | 8df479d049eb00c38072ce48f67faae5d9cf9f18 /tools | |
| parent | 0b8c06b75ea143f3c68aa419c36e82d9ab7454f8 (diff) | |
| download | linux-0ce0c78eff7d22c8a261de6c4305a5abb638c200.tar.bz2 | |
tools/memory-model: Expand the cheatsheet.txt notion of relaxed
This commit adds a key entry enumerating the various types of relaxed
operations. While in the area, it also renames the relaxed rows.
[ paulmck: Apply Boqun Feng feedback. ]
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/memory-model/Documentation/cheatsheet.txt | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/tools/memory-model/Documentation/cheatsheet.txt b/tools/memory-model/Documentation/cheatsheet.txt index 33ba98d72b16..99d00870b160 100644 --- a/tools/memory-model/Documentation/cheatsheet.txt +++ b/tools/memory-model/Documentation/cheatsheet.txt @@ -3,9 +3,9 @@ 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 +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 @@ -17,14 +17,19 @@ 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 +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 |