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authorAndi Kleen <ak@suse.de>2005-11-05 11:25:54 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-14 22:55:15 -0500
commit420f8f68c9c5148dddf946bebdbc7eacde2172cb (patch)
tree59cf49ac38e0c7560bb57d988869f67b1ff20342 /Documentation/x86_64/boot-options.txt
parent485832a5d928facd82f1525270d9f048da2063a1 (diff)
[PATCH] x86_64: New heuristics to find out hotpluggable CPUs.
With a NR_CPUS==128 kernel with CPU hotplug enabled we would waste 4MB on per CPU data of all possible CPUs. The reason was that HOTPLUG always set up possible map to NR_CPUS cpus and then we need to allocate that much (each per CPU data is roughly ~32k now) The underlying problem is that ACPI didn't tell us how many hotplug CPUs the platform supports. So the old code just assumed all, which would lead to this memory wastage. This implements some new heuristics: - If the BIOS specified disabled CPUs in the ACPI/mptables assume they can be enabled later (this is bending the ACPI specification a bit, but seems like a obvious extension) - The user can overwrite it with a new additionals_cpus=NUM option - Otherwise use half of the available CPUs or 2, whatever is more. Cc: ashok.raj@intel.com Cc: len.brown@intel.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/x86_64/boot-options.txt')
-rw-r--r--Documentation/x86_64/boot-options.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index ffe1c062088b..a83139692cdf 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -122,6 +122,9 @@ SMP
122 122
123 cpumask=MASK only use cpus with bits set in mask 123 cpumask=MASK only use cpus with bits set in mask
124 124
125 additional_cpus=NUM Allow NUM more CPUs for hotplug
126 (defaults are specified by the BIOS or half the available CPUs)
127
125NUMA 128NUMA
126 129
127 numa=off Only set up a single NUMA node spanning all memory. 130 numa=off Only set up a single NUMA node spanning all memory.