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authorJeff Garzik <jgarzik@pobox.com>2006-02-20 05:59:59 -0500
committerJeff Garzik <jgarzik@pobox.com>2006-02-20 05:59:59 -0500
commitc5580a7ecb859c6821dd761c95fa150ec7695ae1 (patch)
tree18ca034a53c22e12912e55f5858d1b4a235cedd7 /Documentation
parentb04a92e1601eb6df3a3b6599e7fb7ee021eef2cb (diff)
parentd33a73c81241e3d9ab8da2d0558429bdd5b4ef9a (diff)
downloadop-kernel-dev-c5580a7ecb859c6821dd761c95fa150ec7695ae1.zip
op-kernel-dev-c5580a7ecb859c6821dd761c95fa150ec7695ae1.tar.gz
Merge branch 'forcedeth'
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/cpu-hotplug.txt16
1 files changed, 11 insertions, 5 deletions
diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
index e052780..e71bc6c 100644
--- a/Documentation/cpu-hotplug.txt
+++ b/Documentation/cpu-hotplug.txt
@@ -11,6 +11,8 @@
Joel Schopp <jschopp@austin.ibm.com>
ia64/x86_64:
Ashok Raj <ashok.raj@intel.com>
+ s390:
+ Heiko Carstens <heiko.carstens@de.ibm.com>
Authors: Ashok Raj <ashok.raj@intel.com>
Lots of feedback: Nathan Lynch <nathanl@austin.ibm.com>,
@@ -44,11 +46,9 @@ maxcpus=n Restrict boot time cpus to n. Say if you have 4 cpus, using
maxcpus=2 will only boot 2. You can choose to bring the
other cpus later online, read FAQ's for more info.
-additional_cpus*=n Use this to limit hotpluggable cpus. This option sets
- cpu_possible_map = cpu_present_map + additional_cpus
-
-(*) Option valid only for following architectures
-- x86_64, ia64
+additional_cpus=n [x86_64, s390 only] use this to limit hotpluggable cpus.
+ This option sets
+ cpu_possible_map = cpu_present_map + additional_cpus
ia64 and x86_64 use the number of disabled local apics in ACPI tables MADT
to determine the number of potentially hot-pluggable cpus. The implementation
@@ -58,6 +58,12 @@ mark such hot-pluggable cpus as disabled entries, one could use this
parameter "additional_cpus=x" to represent those cpus in the cpu_possible_map.
+possible_cpus=n [s390 only] use this to set hotpluggable cpus.
+ This option sets possible_cpus bits in
+ cpu_possible_map. Thus keeping the numbers of bits set
+ constant even if the machine gets rebooted.
+ This option overrides additional_cpus.
+
CPU maps and such
-----------------
[More on cpumaps and primitive to manipulate, please check
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