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authorNicholas Piggin2017-08-09 22:41:21 +1000
committerMichael Ellerman2017-08-09 23:45:26 +1000
commit0459ddfdb31e7d812b555a2530ecbacdf96961a6 (patch)
tree872d7e7c3ea27de89c18a2710c672038281f2c8e /Documentation/kernel-hacking
parent7310d5c8c55e8987a854507f71022f8de676bbf4 (diff)
powerpc: NMI IPI improve lock primitive
When the NMI IPI lock is contended, spin at low SMT priority, using loads only, and with interrupts enabled (where possible). This improves behaviour under high contention (e.g., a system crash when a number of CPUs are trying to enter the debugger). Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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