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-rw-r--r--arch/x86/mm/init_64.c12
-rw-r--r--include/linux/memblock.h3
-rw-r--r--mm/page_alloc.c13
3 files changed, 23 insertions, 5 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 96274a90c5ff..e08f1007f776 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1265,6 +1265,18 @@ void __init mem_init(void)
mem_init_print_info(NULL);
}
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask)
+{
+ /*
+ * More CPUs always led to greater speedups on tested systems, up to
+ * all the nodes' CPUs. Use all since the system is otherwise idle
+ * now.
+ */
+ return max_t(int, cpumask_weight(node_cpumask), 1);
+}
+#endif
+
int kernel_set_to_readonly;
void mark_rodata_ro(void)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 45abfc54da37..807ab9daf0cd 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -273,6 +273,9 @@ void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
#define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
for (; i != U64_MAX; \
__next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
+
+int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask);
+
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
/**
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 27ec5dc4db33..fb9dec1c1976 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1836,6 +1836,13 @@ deferred_init_memmap_chunk(unsigned long start_pfn, unsigned long end_pfn,
}
}
+/* An arch may override for more concurrency. */
+__weak int __init
+deferred_page_init_max_threads(const struct cpumask *node_cpumask)
+{
+ return 1;
+}
+
/* Initialise remaining memory on a node */
static int __init deferred_init_memmap(void *data)
{
@@ -1884,11 +1891,7 @@ static int __init deferred_init_memmap(void *data)
first_init_pfn))
goto zone_empty;
- /*
- * More CPUs always led to greater speedups on tested systems, up to
- * all the nodes' CPUs. Use all since the system is otherwise idle now.
- */
- max_threads = max(cpumask_weight(cpumask), 1u);
+ max_threads = deferred_page_init_max_threads(cpumask);
while (spfn < epfn) {
unsigned long epfn_align = ALIGN(epfn, PAGES_PER_SECTION);