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| author | Ingo Molnar <mingo@elte.hu> | 2009-01-05 07:53:39 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-05 07:53:39 -0500 |
| commit | 5359c32eb7402124abc9964d5d53639fe0739cea (patch) | |
| tree | d77b6967fe8420678bb9d1d936855ac0699c196a /Documentation/cpu-hotplug.txt | |
| parent | 8916edef5888c5d8fe283714416a9ca95b4c3431 (diff) | |
| parent | fe0bdec68b77020281dc814805edfe594ae89e0f (diff) | |
Merge branch 'linus' into sched/urgent
Diffstat (limited to 'Documentation/cpu-hotplug.txt')
| -rw-r--r-- | Documentation/cpu-hotplug.txt | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt index 94bbc27ddd4f..9d620c153b04 100644 --- a/Documentation/cpu-hotplug.txt +++ b/Documentation/cpu-hotplug.txt | |||
| @@ -50,16 +50,17 @@ additional_cpus=n (*) Use this to limit hotpluggable cpus. This option sets | |||
| 50 | cpu_possible_map = cpu_present_map + additional_cpus | 50 | cpu_possible_map = cpu_present_map + additional_cpus |
| 51 | 51 | ||
| 52 | (*) Option valid only for following architectures | 52 | (*) Option valid only for following architectures |
| 53 | - x86_64, ia64 | 53 | - ia64 |
| 54 | 54 | ||
| 55 | ia64 and x86_64 use the number of disabled local apics in ACPI tables MADT | 55 | ia64 uses the number of disabled local apics in ACPI tables MADT to |
| 56 | to determine the number of potentially hot-pluggable cpus. The implementation | 56 | determine the number of potentially hot-pluggable cpus. The implementation |
| 57 | should only rely on this to count the # of cpus, but *MUST* not rely on the | 57 | should only rely on this to count the # of cpus, but *MUST* not rely |
| 58 | apicid values in those tables for disabled apics. In the event BIOS doesn't | 58 | on the apicid values in those tables for disabled apics. In the event |
| 59 | mark such hot-pluggable cpus as disabled entries, one could use this | 59 | BIOS doesn't mark such hot-pluggable cpus as disabled entries, one could |
| 60 | parameter "additional_cpus=x" to represent those cpus in the cpu_possible_map. | 60 | use this parameter "additional_cpus=x" to represent those cpus in the |
| 61 | cpu_possible_map. | ||
| 61 | 62 | ||
| 62 | possible_cpus=n [s390 only] use this to set hotpluggable cpus. | 63 | possible_cpus=n [s390,x86_64] use this to set hotpluggable cpus. |
| 63 | This option sets possible_cpus bits in | 64 | This option sets possible_cpus bits in |
| 64 | cpu_possible_map. Thus keeping the numbers of bits set | 65 | cpu_possible_map. Thus keeping the numbers of bits set |
| 65 | constant even if the machine gets rebooted. | 66 | constant even if the machine gets rebooted. |
