mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Gustavo A. R. Silva](/assets/img/avatar_default.png)
In preparation to enable -Wimplicit-fallthrough for Clang, fix a couple of warnings by explicitly adding a break statement instead of just letting the code fall through to the next, and by adding a fallthrough pseudo-keyword in places where the code is intended to fall through. Link: https://github.com/KSPP/linux/issues/115 Link: https://lkml.kernel.org/r/f5756988b8842a3f10008fbc5b0a654f828920a9.1605896059.git.gustavoars@kernel.org Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
208 lines
5.3 KiB
C
208 lines
5.3 KiB
C
// 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);
|
|
break;
|
|
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);
|