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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>
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@ -77,26 +77,12 @@ static inline void flush_map(unsigned long address)
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on_each_cpu(flush_kernel_map, (void *)address, 1, 1);
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}
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struct deferred_page {
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struct deferred_page *next;
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struct page *fpage;
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unsigned long address;
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};
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static struct deferred_page *df_list; /* protected by init_mm.mmap_sem */
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static struct page *deferred_pages; /* protected by init_mm.mmap_sem */
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static inline void save_page(unsigned long address, struct page *fpage)
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static inline void save_page(struct page *fpage)
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{
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struct deferred_page *df;
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df = kmalloc(sizeof(struct deferred_page), GFP_KERNEL);
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if (!df) {
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flush_map(address);
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__free_page(fpage);
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} else {
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df->next = df_list;
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df->fpage = fpage;
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df->address = address;
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df_list = df;
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}
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fpage->lru.next = (struct list_head *)deferred_pages;
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deferred_pages = fpage;
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}
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/*
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@ -163,7 +149,7 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
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switch (page_count(kpte_page)) {
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case 1:
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save_page(address, kpte_page);
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save_page(kpte_page);
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revert_page(address, ref_prot);
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break;
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case 0:
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@ -220,17 +206,17 @@ int change_page_attr(struct page *page, int numpages, pgprot_t prot)
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void global_flush_tlb(void)
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{
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struct deferred_page *df, *next_df;
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struct page *dpage;
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down_read(&init_mm.mmap_sem);
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df = xchg(&df_list, NULL);
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dpage = xchg(&deferred_pages, NULL);
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up_read(&init_mm.mmap_sem);
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flush_map((df && !df->next) ? df->address : 0);
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for (; df; df = next_df) {
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next_df = df->next;
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if (df->fpage)
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__free_page(df->fpage);
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kfree(df);
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flush_map((dpage && !dpage->lru.next) ? (unsigned long)page_address(dpage) : 0);
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while (dpage) {
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struct page *tmp = dpage;
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dpage = (struct page *)dpage->lru.next;
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__free_page(tmp);
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}
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}
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