diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 34dac7cef4cf..3c87a69cffcb 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1840,30 +1840,29 @@ keepinitrd [HW,ARM] kernelcore= [KNL,X86,IA-64,PPC] - Format: nn[KMGTPE] | "mirror" - This parameter - specifies the amount of memory usable by the kernel - for non-movable allocations. The requested amount is - spread evenly throughout all nodes in the system. The - remaining memory in each node is used for Movable - pages. In the event, a node is too small to have both - kernelcore and Movable pages, kernelcore pages will - take priority and other nodes will have a larger number - of Movable pages. The Movable zone is used for the - allocation of pages that may be reclaimed or moved - by the page migration subsystem. This means that - HugeTLB pages may not be allocated from this zone. - Note that allocations like PTEs-from-HighMem still - use the HighMem zone if it exists, and the Normal + Format: nn[KMGTPE] | nn% | "mirror" + This parameter specifies the amount of memory usable by + the kernel for non-movable allocations. The requested + amount is spread evenly throughout all nodes in the + system as ZONE_NORMAL. The remaining memory is used for + movable memory in its own zone, ZONE_MOVABLE. In the + event, a node is too small to have both ZONE_NORMAL and + ZONE_MOVABLE, kernelcore memory will take priority and + other nodes will have a larger ZONE_MOVABLE. + + ZONE_MOVABLE is used for the allocation of pages that + may be reclaimed or moved by the page migration + subsystem. Note that allocations like PTEs-from-HighMem + still use the HighMem zone if it exists, and the Normal zone if it does not. - Instead of specifying the amount of memory (nn[KMGTPE]), - you can specify "mirror" option. In case "mirror" + It is possible to specify the exact amount of memory in + the form of "nn[KMGTPE]", a percentage of total system + memory in the form of "nn%", or "mirror". If "mirror" option is specified, mirrored (reliable) memory is used for non-movable allocations and remaining memory is used - for Movable pages. nn[KMGTPE] and "mirror" are exclusive, - so you can NOT specify nn[KMGTPE] and "mirror" at the same - time. + for Movable pages. "nn[KMGTPE]", "nn%", and "mirror" + are exclusive, so you cannot specify multiple forms. kgdbdbgp= [KGDB,HW] kgdb over EHCI usb debug port. Format: <Controller#>[,poll interval] @@ -2377,13 +2376,14 @@ mousedev.yres= [MOUSE] Vertical screen resolution, used for devices reporting absolute coordinates, such as tablets - movablecore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter - is similar to kernelcore except it specifies the - amount of memory used for migratable allocations. - If both kernelcore and movablecore is specified, - then kernelcore will be at *least* the specified - value but may be more. If movablecore on its own - is specified, the administrator must be careful + movablecore= [KNL,X86,IA-64,PPC] + Format: nn[KMGTPE] | nn% + This parameter is the complement to kernelcore=, it + specifies the amount of memory used for migratable + allocations. If both kernelcore and movablecore is + specified, then kernelcore will be at *least* the + specified value but may be more. If movablecore on its + own is specified, the administrator must be careful that the amount of memory usable for all allocations is not too small. |