34feb2c83b
This adds caching of pgds and puds, pmds, pte. That way we can avoid costly zeroing and initialization of special mappings in the pgd. A second quicklist is useful to separate out PGD handling. We can carry the initialized pgds over to the next process needing them. Also clean up the pgd_list handling to use regular list macros. There is no need anymore to avoid the lru field. Move the add/removal of the pgds to the pgdlist into the constructor / destructor. That way the implementation is congruent with i386. Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: "Luck, Tony" <tony.luck@intel.com> Acked-by: William Lee Irwin III <wli@holomorphy.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
#ifndef _X86_64_PGALLOC_H
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#define _X86_64_PGALLOC_H
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#include <asm/pda.h>
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#include <linux/threads.h>
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#include <linux/mm.h>
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#include <linux/quicklist.h>
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#define QUICK_PGD 0 /* We preserve special mappings over free */
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#define QUICK_PT 1 /* Other page table pages that are zero on free */
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#define pmd_populate_kernel(mm, pmd, pte) \
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set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
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#define pud_populate(mm, pud, pmd) \
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set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
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#define pgd_populate(mm, pgd, pud) \
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set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
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{
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set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
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}
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static inline void pmd_free(pmd_t *pmd)
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{
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BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
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quicklist_free(QUICK_PT, NULL, pmd);
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}
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static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
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{
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return (pmd_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
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}
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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return (pud_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
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}
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static inline void pud_free (pud_t *pud)
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{
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BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
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quicklist_free(QUICK_PT, NULL, pud);
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}
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static inline void pgd_list_add(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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spin_lock(&pgd_lock);
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list_add(&page->lru, &pgd_list);
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spin_unlock(&pgd_lock);
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}
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static inline void pgd_list_del(pgd_t *pgd)
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{
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struct page *page = virt_to_page(pgd);
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spin_lock(&pgd_lock);
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list_del(&page->lru);
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spin_unlock(&pgd_lock);
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}
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static inline void pgd_ctor(void *x)
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{
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unsigned boundary;
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pgd_t *pgd = x;
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struct page *page = virt_to_page(pgd);
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/*
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* Copy kernel pointers in from init.
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*/
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boundary = pgd_index(__PAGE_OFFSET);
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memcpy(pgd + boundary,
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init_level4_pgt + boundary,
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(PTRS_PER_PGD - boundary) * sizeof(pgd_t));
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spin_lock(&pgd_lock);
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list_add(&page->lru, &pgd_list);
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spin_unlock(&pgd_lock);
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}
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static inline void pgd_dtor(void *x)
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{
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pgd_t *pgd = x;
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struct page *page = virt_to_page(pgd);
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spin_lock(&pgd_lock);
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list_del(&page->lru);
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spin_unlock(&pgd_lock);
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd = (pgd_t *)quicklist_alloc(QUICK_PGD,
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GFP_KERNEL|__GFP_REPEAT, pgd_ctor);
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return pgd;
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
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quicklist_free(QUICK_PGD, pgd_dtor, pgd);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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return (pte_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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void *p = (void *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
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if (!p)
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return NULL;
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return virt_to_page(p);
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}
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/* Should really implement gc for free page table pages. This could be
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done with a reference count in struct page. */
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static inline void pte_free_kernel(pte_t *pte)
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{
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BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
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quicklist_free(QUICK_PT, NULL, pte);
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}
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static inline void pte_free(struct page *pte)
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{
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quicklist_free_page(QUICK_PT, NULL, pte);
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}
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#define __pte_free_tlb(tlb,pte) quicklist_free_page(QUICK_PT, NULL,(pte))
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#define __pmd_free_tlb(tlb,x) quicklist_free(QUICK_PT, NULL, (x))
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#define __pud_free_tlb(tlb,x) quicklist_free(QUICK_PT, NULL, (x))
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static inline void check_pgt_cache(void)
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{
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quicklist_trim(QUICK_PGD, pgd_dtor, 25, 16);
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quicklist_trim(QUICK_PT, NULL, 25, 16);
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}
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#endif /* _X86_64_PGALLOC_H */
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