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2ee9abf
2013 Nov 11
1
[PATCH] x86/idle: reduce contention on ACPI register accesses
Other than when they''re located in I/O port space, accessing them when
in MMIO space (currently) implies usage of some sort of global lock: In
-unstable this would be due to the use of vmap(), is older trees the
necessary locking was introduced by 2ee9cbf9 ("ACPI: fix
acpi_os_map_memory()"). This contention was observed to result in Dom0
kernel soft lockups during the loading of the ACPI processor driver
there on systems with very many CPU cores.
There are a couple of things being done for this:
- re-order elements of an if() condition so...