Messages in this thread |  | | | Date | Tue, 14 Dec 2010 11:48:47 -0600 | | From | Christoph Lameter <> | | Subject | [cpuops cmpxchg double V1 0/4] this_cpu_cmpxchg_double support |
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This patch series introduces this_cpu_cmpxchg_double().
x86 cpus support cmpxchg16b and cmpxchg8b that can be used to perform a cmpxchg with two words instead of only one. That allows to put more state into an atomic instruction.
this_cpu_cmpxchg_double() is then used in the slub allocator to avoid interrupt disable/enable in both alloc and free fastpath. this_cpu_cmpxchg_double works nicely with the per cpu data of the allocator. Doing so significantly speeds up the fastpaths.
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