diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 10 | ||||
| -rw-r--r-- | mm/page_alloc.c | 65 |
2 files changed, 68 insertions, 7 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 1794aff..9a54148 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -833,6 +833,16 @@ and is between 256 and 4096 characters. It is defined in the file use the HighMem zone if it exists, and the Normal zone if it does not. + movablecore=nn[KMG] [KNL,IA-32,IA-64,PPC,X86-64] 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 + that the amount of memory usable for all allocations + is not too small. + keepinitrd [HW,ARM] kstack=N [IA-32,X86-64] Print N words from the kernel stack diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 0a53728..ac4f8c6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -137,6 +137,7 @@ static unsigned long __meminitdata dma_reserve; static unsigned long __meminitdata node_boundary_end_pfn[MAX_NUMNODES]; #endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */ unsigned long __initdata required_kernelcore; + unsigned long __initdata required_movablecore; unsigned long __initdata zone_movable_pfn[MAX_NUMNODES]; /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ @@ -3219,6 +3220,18 @@ unsigned long __init find_max_pfn_with_active_regions(void) return max_pfn; } +unsigned long __init early_calculate_totalpages(void) +{ + int i; + unsigned long totalpages = 0; + + for (i = 0; i < nr_nodemap_entries; i++) + totalpages += early_node_map[i].end_pfn - + early_node_map[i].start_pfn; + + return totalpages; +} + /* * Find the PFN the Movable zone begins in each node. Kernel memory * is spread evenly between nodes as long as the nodes have enough @@ -3232,6 +3245,29 @@ void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn) unsigned long kernelcore_node, kernelcore_remaining; int usable_nodes = num_online_nodes(); + /* + * If movablecore was specified, calculate what size of + * kernelcore that corresponds so that memory usable for + * any allocation type is evenly spread. If both kernelcore + * and movablecore are specified, then the value of kernelcore + * will be used for required_kernelcore if it's greater than + * what movablecore would have allowed. + */ + if (required_movablecore) { + unsigned long totalpages = early_calculate_totalpages(); + unsigned long corepages; + + /* + * Round-up so that ZONE_MOVABLE is at least as large as what + * was requested by the user + */ + required_movablecore = + roundup(required_movablecore, MAX_ORDER_NR_PAGES); + corepages = totalpages - required_movablecore; + + required_kernelcore = max(required_kernelcore, corepages); + } + /* If kernelcore was not specified, there is no ZONE_MOVABLE */ if (!required_kernelcore) return; @@ -3412,26 +3448,41 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) } } -/* - * kernelcore=size sets the amount of memory for use for allocations that - * cannot be reclaimed or migrated. - */ -static int __init cmdline_parse_kernelcore(char *p) +static int __init cmdline_parse_core(char *p, unsigned long *core) { unsigned long long coremem; if (!p) return -EINVAL; coremem = memparse(p, &p); - required_kernelcore = coremem >> PAGE_SHIFT; + *core = coremem >> PAGE_SHIFT; - /* Paranoid check that UL is enough for required_kernelcore */ + /* Paranoid check that UL is enough for the coremem value */ WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); return 0; } +/* + * kernelcore=size sets the amount of memory for use for allocations that + * cannot be reclaimed or migrated. + */ +static int __init cmdline_parse_kernelcore(char *p) +{ + return cmdline_parse_core(p, &required_kernelcore); +} + +/* + * movablecore=size sets the amount of memory for use for allocations that + * can be reclaimed or migrated. + */ +static int __init cmdline_parse_movablecore(char *p) +{ + return cmdline_parse_core(p, &required_movablecore); +} + early_param("kernelcore", cmdline_parse_kernelcore); +early_param("movablecore", cmdline_parse_movablecore); #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |