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-rw-r--r--mm/mm_init.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/mm/mm_init.c b/mm/mm_init.c
new file mode 100644
index 000000000..b06a30fbe
--- /dev/null
+++ b/mm/mm_init.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * mm_init.c - Memory initialisation verification and debugging
+ *
+ * Copyright 2008 IBM Corporation, 2008
+ * Author Mel Gorman <mel@csn.ul.ie>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kobject.h>
+#include <linux/export.h>
+#include <linux/memory.h>
+#include <linux/notifier.h>
+#include <linux/sched.h>
+#include <linux/mman.h>
+#include "internal.h"
+
+#ifdef CONFIG_DEBUG_MEMORY_INIT
+int __meminitdata mminit_loglevel;
+
+#ifndef SECTIONS_SHIFT
+#define SECTIONS_SHIFT 0
+#endif
+
+/* The zonelists are simply reported, validation is manual. */
+void __init mminit_verify_zonelist(void)
+{
+ int nid;
+
+ if (mminit_loglevel < MMINIT_VERIFY)
+ return;
+
+ for_each_online_node(nid) {
+ pg_data_t *pgdat = NODE_DATA(nid);
+ struct zone *zone;
+ struct zoneref *z;
+ struct zonelist *zonelist;
+ int i, listid, zoneid;
+
+ BUILD_BUG_ON(MAX_ZONELISTS > 2);
+ for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
+
+ /* Identify the zone and nodelist */
+ zoneid = i % MAX_NR_ZONES;
+ listid = i / MAX_NR_ZONES;
+ zonelist = &pgdat->node_zonelists[listid];
+ zone = &pgdat->node_zones[zoneid];
+ if (!populated_zone(zone))
+ continue;
+
+ /* Print information about the zonelist */
+ printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
+ listid > 0 ? "thisnode" : "general", nid,
+ zone->name);
+
+ /* Iterate the zonelist */
+ for_each_zone_zonelist(zone, z, zonelist, zoneid)
+ pr_cont("%d:%s ", zone_to_nid(zone), zone->name);
+ pr_cont("\n");
+ }
+ }
+}
+
+void __init mminit_verify_pageflags_layout(void)
+{
+ int shift, width;
+ unsigned long or_mask, add_mask;
+
+ shift = 8 * sizeof(unsigned long);
+ width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH
+ - LAST_CPUPID_SHIFT - KASAN_TAG_WIDTH;
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
+ "Section %d Node %d Zone %d Lastcpupid %d Kasantag %d Flags %d\n",
+ SECTIONS_WIDTH,
+ NODES_WIDTH,
+ ZONES_WIDTH,
+ LAST_CPUPID_WIDTH,
+ KASAN_TAG_WIDTH,
+ NR_PAGEFLAGS);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
+ "Section %d Node %d Zone %d Lastcpupid %d Kasantag %d\n",
+ SECTIONS_SHIFT,
+ NODES_SHIFT,
+ ZONES_SHIFT,
+ LAST_CPUPID_SHIFT,
+ KASAN_TAG_WIDTH);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
+ "Section %lu Node %lu Zone %lu Lastcpupid %lu Kasantag %lu\n",
+ (unsigned long)SECTIONS_PGSHIFT,
+ (unsigned long)NODES_PGSHIFT,
+ (unsigned long)ZONES_PGSHIFT,
+ (unsigned long)LAST_CPUPID_PGSHIFT,
+ (unsigned long)KASAN_TAG_PGSHIFT);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
+ "Node/Zone ID: %lu -> %lu\n",
+ (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
+ (unsigned long)ZONEID_PGOFF);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
+ "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
+ shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
+#ifdef NODE_NOT_IN_PAGE_FLAGS
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
+ "Node not in page flags");
+#endif
+#ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
+ "Last cpupid not in page flags");
+#endif
+
+ if (SECTIONS_WIDTH) {
+ shift -= SECTIONS_WIDTH;
+ BUG_ON(shift != SECTIONS_PGSHIFT);
+ }
+ if (NODES_WIDTH) {
+ shift -= NODES_WIDTH;
+ BUG_ON(shift != NODES_PGSHIFT);
+ }
+ if (ZONES_WIDTH) {
+ shift -= ZONES_WIDTH;
+ BUG_ON(shift != ZONES_PGSHIFT);
+ }
+
+ /* Check for bitmask overlaps */
+ or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
+ (NODES_MASK << NODES_PGSHIFT) |
+ (SECTIONS_MASK << SECTIONS_PGSHIFT);
+ add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
+ (NODES_MASK << NODES_PGSHIFT) +
+ (SECTIONS_MASK << SECTIONS_PGSHIFT);
+ BUG_ON(or_mask != add_mask);
+}
+
+static __init int set_mminit_loglevel(char *str)
+{
+ get_option(&str, &mminit_loglevel);
+ return 0;
+}
+early_param("mminit_loglevel", set_mminit_loglevel);
+#endif /* CONFIG_DEBUG_MEMORY_INIT */
+
+struct kobject *mm_kobj;
+EXPORT_SYMBOL_GPL(mm_kobj);
+
+#ifdef CONFIG_SMP
+s32 vm_committed_as_batch = 32;
+
+void mm_compute_batch(int overcommit_policy)
+{
+ u64 memsized_batch;
+ s32 nr = num_present_cpus();
+ s32 batch = max_t(s32, nr*2, 32);
+ unsigned long ram_pages = totalram_pages();
+
+ /*
+ * For policy OVERCOMMIT_NEVER, set batch size to 0.4% of
+ * (total memory/#cpus), and lift it to 25% for other policies
+ * to easy the possible lock contention for percpu_counter
+ * vm_committed_as, while the max limit is INT_MAX
+ */
+ if (overcommit_policy == OVERCOMMIT_NEVER)
+ memsized_batch = min_t(u64, ram_pages/nr/256, INT_MAX);
+ else
+ memsized_batch = min_t(u64, ram_pages/nr/4, INT_MAX);
+
+ vm_committed_as_batch = max_t(s32, memsized_batch, batch);
+}
+
+static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
+ unsigned long action, void *arg)
+{
+ switch (action) {
+ case MEM_ONLINE:
+ case MEM_OFFLINE:
+ mm_compute_batch(sysctl_overcommit_memory);
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block compute_batch_nb __meminitdata = {
+ .notifier_call = mm_compute_batch_notifier,
+ .priority = IPC_CALLBACK_PRI, /* use lowest priority */
+};
+
+static int __init mm_compute_batch_init(void)
+{
+ mm_compute_batch(sysctl_overcommit_memory);
+ register_hotmemory_notifier(&compute_batch_nb);
+
+ return 0;
+}
+
+__initcall(mm_compute_batch_init);
+
+#endif
+
+static int __init mm_sysfs_init(void)
+{
+ mm_kobj = kobject_create_and_add("mm", kernel_kobj);
+ if (!mm_kobj)
+ return -ENOMEM;
+
+ return 0;
+}
+postcore_initcall(mm_sysfs_init);