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[PATCH] memory hotplug locking: node_size_lock

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pgdat->node_size_lock is basically only neeeded in one place in the normal
code: show_mem(), which is the arch-specific sysrq-m printing function.

Strictly speaking, the architectures not doing memory hotplug do no need this
locking in show_mem().  However, they are all included for completeness.  This
should also make any future consolidation of all of the implementations a
little more straightforward.

This lock is also held in the sparsemem code during a memory removal, as
sections are invalidated.  This is the place there pfn_valid() is made false
for a memory area that's being removed.  The lock is only required when doing
pfn_valid() operations on memory which the user does not already have a
reference on the page, such as in show_mem().

Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Hansen 2005-10-29 18:16:52 -07:00 • committed by Linus Torvalds
commit 208d54e551
9 changed files with 76 additions and 2 deletions
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3
arch/alpha/mm/numa.c
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@ -371,6 +371,8 @@ show_mem(void)
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
for_each_online_node(nid) {
unsigned long flags;
pgdat_resize_lock(NODE_DATA(nid), &flags);
i = node_spanned_pages(nid);
while (i-- > 0) {
struct page *page = nid_page_nr(nid, i);
@ -384,6 +386,7 @@ show_mem(void)
else
shared += page_count(page) - 1;
}
pgdat_resize_unlock(NODE_DATA(nid), &flags);
}
printk("%ld pages of RAM\n",total);
printk("%ld free pages\n",free);