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[PATCH] x86_64: pageattr use single list 

Use page->lru.next to implement the singly linked list of pages rather than
the struct deferred_page which needs to be allocated and freed for each
page.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-03-22 00:08:32 -08:00 committed by Linus Torvalds
parent 84d1c054b1
commit 20aaffd6a6
1 changed files with 13 additions and 27 deletions
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40
arch/x86_64/mm/pageattr.c
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@ -77,26 +77,12 @@ static inline void flush_map(unsigned long address)
on_each_cpu(flush_kernel_map, (void *)address, 1, 1);
}
struct deferred_page {
struct deferred_page *next;
struct page *fpage;
unsigned long address;
};
static struct deferred_page *df_list; /* protected by init_mm.mmap_sem */
static struct page *deferred_pages; /* protected by init_mm.mmap_sem */
static inline void save_page(unsigned long address, struct page *fpage)
static inline void save_page(struct page *fpage)
{
struct deferred_page *df;
df = kmalloc(sizeof(struct deferred_page), GFP_KERNEL);
if (!df) {
flush_map(address);
__free_page(fpage);
} else {
df->next = df_list;
df->fpage = fpage;
df->address = address;
df_list = df;
}
fpage->lru.next = (struct list_head *)deferred_pages;
deferred_pages = fpage;
}
/*
@ -163,7 +149,7 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
switch (page_count(kpte_page)) {
case 1:
save_page(address, kpte_page);
save_page(kpte_page);
revert_page(address, ref_prot);
break;
case 0:
@ -220,17 +206,17 @@ int change_page_attr(struct page *page, int numpages, pgprot_t prot)
void global_flush_tlb(void)
{
struct deferred_page *df, *next_df;
struct page *dpage;
down_read(&init_mm.mmap_sem);
df = xchg(&df_list, NULL);
dpage = xchg(&deferred_pages, NULL);
up_read(&init_mm.mmap_sem);
flush_map((df && !df->next) ? df->address : 0);
for (; df; df = next_df) {
next_df = df->next;
if (df->fpage)
__free_page(df->fpage);
kfree(df);
flush_map((dpage && !dpage->lru.next) ? (unsigned long)page_address(dpage) : 0);
while (dpage) {
struct page *tmp = dpage;
dpage = (struct page *)dpage->lru.next;
__free_page(tmp);
}
}