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![Mel Gorman](/assets/img/avatar_default.png)
mminit_verify_page_links() is an extremely paranoid check that was introduced when memory initialisation was being heavily reworked. Profiles indicated that up to 10% of parallel memory initialisation was spent on checking this for every page. The cost could be reduced but in practice this check only found problems very early during the initialisation rewrite and has found nothing since. This patch removes an expensive unnecessary check. Signed-off-by: Mel Gorman <mgorman@suse.de> Tested-by: Nate Zimmer <nzimmer@sgi.com> Tested-by: Waiman Long <waiman.long@hp.com> Tested-by: Daniel J Blueman <daniel@numascale.com> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Robin Holt <robinmholt@gmail.com> Cc: Nate Zimmer <nzimmer@sgi.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Waiman Long <waiman.long@hp.com> Cc: Scott Norton <scott.norton@hp.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
198 lines
4.9 KiB
C
198 lines
4.9 KiB
C
/*
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* mm_init.c - Memory initialisation verification and debugging
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*
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* Copyright 2008 IBM Corporation, 2008
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* Author Mel Gorman <mel@csn.ul.ie>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/export.h>
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#include <linux/memory.h>
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#include <linux/notifier.h>
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#include <linux/sched.h>
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#include "internal.h"
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#ifdef CONFIG_DEBUG_MEMORY_INIT
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int __meminitdata mminit_loglevel;
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#ifndef SECTIONS_SHIFT
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#define SECTIONS_SHIFT 0
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#endif
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/* The zonelists are simply reported, validation is manual. */
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void __init mminit_verify_zonelist(void)
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{
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int nid;
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if (mminit_loglevel < MMINIT_VERIFY)
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return;
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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struct zone *zone;
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struct zoneref *z;
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struct zonelist *zonelist;
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int i, listid, zoneid;
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BUG_ON(MAX_ZONELISTS > 2);
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for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
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/* Identify the zone and nodelist */
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zoneid = i % MAX_NR_ZONES;
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listid = i / MAX_NR_ZONES;
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zonelist = &pgdat->node_zonelists[listid];
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zone = &pgdat->node_zones[zoneid];
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if (!populated_zone(zone))
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continue;
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/* Print information about the zonelist */
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printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
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listid > 0 ? "thisnode" : "general", nid,
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zone->name);
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/* Iterate the zonelist */
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for_each_zone_zonelist(zone, z, zonelist, zoneid) {
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#ifdef CONFIG_NUMA
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printk(KERN_CONT "%d:%s ",
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zone->node, zone->name);
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#else
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printk(KERN_CONT "0:%s ", zone->name);
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#endif /* CONFIG_NUMA */
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}
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printk(KERN_CONT "\n");
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}
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}
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}
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void __init mminit_verify_pageflags_layout(void)
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{
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int shift, width;
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unsigned long or_mask, add_mask;
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shift = 8 * sizeof(unsigned long);
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width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT;
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
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"Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
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SECTIONS_WIDTH,
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NODES_WIDTH,
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ZONES_WIDTH,
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LAST_CPUPID_WIDTH,
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NR_PAGEFLAGS);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
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"Section %d Node %d Zone %d Lastcpupid %d\n",
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SECTIONS_SHIFT,
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NODES_SHIFT,
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ZONES_SHIFT,
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LAST_CPUPID_SHIFT);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
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"Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
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(unsigned long)SECTIONS_PGSHIFT,
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(unsigned long)NODES_PGSHIFT,
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(unsigned long)ZONES_PGSHIFT,
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(unsigned long)LAST_CPUPID_PGSHIFT);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
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"Node/Zone ID: %lu -> %lu\n",
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(unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
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(unsigned long)ZONEID_PGOFF);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
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"location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
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shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
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#ifdef NODE_NOT_IN_PAGE_FLAGS
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
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"Node not in page flags");
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#endif
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#ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
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"Last cpupid not in page flags");
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#endif
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if (SECTIONS_WIDTH) {
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shift -= SECTIONS_WIDTH;
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BUG_ON(shift != SECTIONS_PGSHIFT);
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}
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if (NODES_WIDTH) {
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shift -= NODES_WIDTH;
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BUG_ON(shift != NODES_PGSHIFT);
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}
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if (ZONES_WIDTH) {
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shift -= ZONES_WIDTH;
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BUG_ON(shift != ZONES_PGSHIFT);
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}
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/* Check for bitmask overlaps */
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or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
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(NODES_MASK << NODES_PGSHIFT) |
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(SECTIONS_MASK << SECTIONS_PGSHIFT);
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add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
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(NODES_MASK << NODES_PGSHIFT) +
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(SECTIONS_MASK << SECTIONS_PGSHIFT);
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BUG_ON(or_mask != add_mask);
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}
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static __init int set_mminit_loglevel(char *str)
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{
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get_option(&str, &mminit_loglevel);
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return 0;
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}
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early_param("mminit_loglevel", set_mminit_loglevel);
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#endif /* CONFIG_DEBUG_MEMORY_INIT */
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struct kobject *mm_kobj;
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EXPORT_SYMBOL_GPL(mm_kobj);
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#ifdef CONFIG_SMP
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s32 vm_committed_as_batch = 32;
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static void __meminit mm_compute_batch(void)
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{
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u64 memsized_batch;
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s32 nr = num_present_cpus();
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s32 batch = max_t(s32, nr*2, 32);
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/* batch size set to 0.4% of (total memory/#cpus), or max int32 */
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memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
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vm_committed_as_batch = max_t(s32, memsized_batch, batch);
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}
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static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
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unsigned long action, void *arg)
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{
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switch (action) {
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case MEM_ONLINE:
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case MEM_OFFLINE:
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mm_compute_batch();
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block compute_batch_nb __meminitdata = {
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.notifier_call = mm_compute_batch_notifier,
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.priority = IPC_CALLBACK_PRI, /* use lowest priority */
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};
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static int __init mm_compute_batch_init(void)
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{
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mm_compute_batch();
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register_hotmemory_notifier(&compute_batch_nb);
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return 0;
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}
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__initcall(mm_compute_batch_init);
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#endif
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static int __init mm_sysfs_init(void)
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{
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mm_kobj = kobject_create_and_add("mm", kernel_kobj);
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if (!mm_kobj)
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return -ENOMEM;
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return 0;
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}
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postcore_initcall(mm_sysfs_init);
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