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| author | Baoquan He <bhe@redhat.com> | 2024-03-25 17:56:43 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-04-26 06:56:10 +0300 |
| commit | 8ad4184985e844ab5848dbf8b7b02f4e14b5d010 (patch) | |
| tree | 8849e33b69befc395f2a913760b4c75ab71ba702 /mm/mm_init.c | |
| parent | 6600a6b10c3210280e7623b8ba7feac9619cc2cd (diff) | |
| download | linux-8ad4184985e844ab5848dbf8b7b02f4e14b5d010.tar.xz | |
mm/mm_init.c: add new function calc_nr_all_pages()
This is a preparation to calculate nr_kernel_pages and nr_all_pages, both
of which will be used later in alloc_large_system_hash().
nr_all_pages counts up all free but not reserved memory in memblock
allocator, including HIGHMEM memory. While nr_kernel_pages counts up all
free but not reserved low memory in memblock allocator, excluding HIGHMEM
memory.
Link: https://lkml.kernel.org/r/20240325145646.1044760-4-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mm_init.c')
| -rw-r--r-- | mm/mm_init.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c index 91bb8600c0fa..ae9149956497 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1265,6 +1265,30 @@ static void __init reset_memoryless_node_totalpages(struct pglist_data *pgdat) pr_debug("On node %d totalpages: 0\n", pgdat->node_id); } +static void __init calc_nr_kernel_pages(void) +{ + unsigned long start_pfn, end_pfn; + phys_addr_t start_addr, end_addr; + u64 u; +#ifdef CONFIG_HIGHMEM + unsigned long high_zone_low = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM]; +#endif + + for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start_addr, &end_addr, NULL) { + start_pfn = PFN_UP(start_addr); + end_pfn = PFN_DOWN(end_addr); + + if (start_pfn < end_pfn) { + nr_all_pages += end_pfn - start_pfn; +#ifdef CONFIG_HIGHMEM + start_pfn = clamp(start_pfn, 0, high_zone_low); + end_pfn = clamp(end_pfn, 0, high_zone_low); +#endif + nr_kernel_pages += end_pfn - start_pfn; + } + } +} + static void __init calculate_node_totalpages(struct pglist_data *pgdat, unsigned long node_start_pfn, unsigned long node_end_pfn) |