154 lines
5.7 KiB
Plaintext
154 lines
5.7 KiB
Plaintext
This directory contains the following litmus tests:
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CoRR+poonceonce+Once.litmus
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Test of read-read coherence, that is, whether or not two
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successive reads from the same variable are ordered.
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CoRW+poonceonce+Once.litmus
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Test of read-write coherence, that is, whether or not a read
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from a given variable followed by a write to that same variable
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are ordered.
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CoWR+poonceonce+Once.litmus
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Test of write-read coherence, that is, whether or not a write
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to a given variable followed by a read from that same variable
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are ordered.
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CoWW+poonceonce.litmus
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Test of write-write coherence, that is, whether or not two
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successive writes to the same variable are ordered.
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IRIW+fencembonceonces+OnceOnce.litmus
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Test of independent reads from independent writes with smp_mb()
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between each pairs of reads. In other words, is smp_mb()
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sufficient to cause two different reading processes to agree on
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the order of a pair of writes, where each write is to a different
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variable by a different process? This litmus test is forbidden
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by LKMM's propagation rule.
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IRIW+poonceonces+OnceOnce.litmus
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Test of independent reads from independent writes with nothing
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between each pairs of reads. In other words, is anything at all
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needed to cause two different reading processes to agree on the
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order of a pair of writes, where each write is to a different
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variable by a different process?
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ISA2+pooncelock+pooncelock+pombonce.litmus
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Tests whether the ordering provided by a lock-protected S
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litmus test is visible to an external process whose accesses are
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separated by smp_mb(). This addition of an external process to
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S is otherwise known as ISA2.
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ISA2+poonceonces.litmus
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As below, but with store-release replaced with WRITE_ONCE()
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and load-acquire replaced with READ_ONCE().
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ISA2+pooncerelease+poacquirerelease+poacquireonce.litmus
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Can a release-acquire chain order a prior store against
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a later load?
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LB+fencembonceonce+ctrlonceonce.litmus
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Does a control dependency and an smp_mb() suffice for the
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load-buffering litmus test, where each process reads from one
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of two variables then writes to the other?
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LB+poacquireonce+pooncerelease.litmus
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Does a release-acquire pair suffice for the load-buffering
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litmus test, where each process reads from one of two variables then
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writes to the other?
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LB+poonceonces.litmus
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As above, but with store-release replaced with WRITE_ONCE()
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and load-acquire replaced with READ_ONCE().
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MP+onceassign+derefonce.litmus
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As below, but with rcu_assign_pointer() and an rcu_dereference().
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MP+polockmbonce+poacquiresilsil.litmus
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Protect the access with a lock and an smp_mb__after_spinlock()
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in one process, and use an acquire load followed by a pair of
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spin_is_locked() calls in the other process.
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MP+polockonce+poacquiresilsil.litmus
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Protect the access with a lock in one process, and use an
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acquire load followed by a pair of spin_is_locked() calls
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in the other process.
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MP+polocks.litmus
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As below, but with the second access of the writer process
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and the first access of reader process protected by a lock.
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MP+poonceonces.litmus
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As below, but without the smp_rmb() and smp_wmb().
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MP+pooncerelease+poacquireonce.litmus
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As below, but with a release-acquire chain.
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MP+porevlocks.litmus
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As below, but with the first access of the writer process
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and the second access of reader process protected by a lock.
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MP+fencewmbonceonce+fencermbonceonce.litmus
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Does a smp_wmb() (between the stores) and an smp_rmb() (between
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the loads) suffice for the message-passing litmus test, where one
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process writes data and then a flag, and the other process reads
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the flag and then the data. (This is similar to the ISA2 tests,
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but with two processes instead of three.)
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R+fencembonceonces.litmus
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This is the fully ordered (via smp_mb()) version of one of
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the classic counterintuitive litmus tests that illustrates the
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effects of store propagation delays.
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R+poonceonces.litmus
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As above, but without the smp_mb() invocations.
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SB+fencembonceonces.litmus
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This is the fully ordered (again, via smp_mb() version of store
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buffering, which forms the core of Dekker's mutual-exclusion
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algorithm.
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SB+poonceonces.litmus
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As above, but without the smp_mb() invocations.
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SB+rfionceonce-poonceonces.litmus
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This litmus test demonstrates that LKMM is not fully multicopy
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atomic. (Neither is it other multicopy atomic.) This litmus test
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also demonstrates the "locations" debugging aid, which designates
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additional registers and locations to be printed out in the dump
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of final states in the herd7 output. Without the "locations"
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statement, only those registers and locations mentioned in the
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"exists" clause will be printed.
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S+poonceonces.litmus
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As below, but without the smp_wmb() and acquire load.
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S+fencewmbonceonce+poacquireonce.litmus
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Can a smp_wmb(), instead of a release, and an acquire order
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a prior store against a subsequent store?
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WRC+poonceonces+Once.litmus
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WRC+pooncerelease+fencermbonceonce+Once.litmus
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These two are members of an extension of the MP litmus-test
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class in which the first write is moved to a separate process.
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The second is forbidden because smp_store_release() is
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A-cumulative in LKMM.
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Z6.0+pooncelock+pooncelock+pombonce.litmus
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Is the ordering provided by a spin_unlock() and a subsequent
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spin_lock() sufficient to make ordering apparent to accesses
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by a process not holding the lock?
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Z6.0+pooncelock+poonceLock+pombonce.litmus
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As above, but with smp_mb__after_spinlock() immediately
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following the spin_lock().
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Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus
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Is the ordering provided by a release-acquire chain sufficient
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to make ordering apparent to accesses by a process that does
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not participate in that release-acquire chain?
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A great many more litmus tests are available here:
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https://github.com/paulmckrcu/litmus
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