mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2024-11-21 19:46:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

mm/mm_init.c: add new function calc_nr_all_pages()

Browse Source 
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>
This commit is contained in:
Baoquan He 2024-03-25 22:56:43 +08:00 committed by Andrew Morton
parent 6600a6b10c
commit 8ad4184985
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
mm/mm_init.c
View File

@ -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)