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[SPARC64]: Kill pgtable quicklists and use SLAB.
Taking a nod from the powerpc port. With the per-cpu caching of both the page allocator and SLAB, the pgtable quicklist scheme becomes relatively silly and primitive. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
David S. Miller
parent
05e28f9de6
commit
3c93646524
5 changed files with 48 additions and 170 deletions
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@ -241,10 +241,6 @@ EXPORT_SYMBOL(verify_compat_iovec);
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#endif
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EXPORT_SYMBOL(dump_fpu);
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EXPORT_SYMBOL(pte_alloc_one_kernel);
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#ifndef CONFIG_SMP
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EXPORT_SYMBOL(pgt_quicklists);
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#endif
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EXPORT_SYMBOL(put_fs_struct);
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/* math-emu wants this */
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@ -141,26 +141,25 @@ unsigned long sparc64_kern_sec_context __read_mostly;
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int bigkernel = 0;
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/* XXX Tune this... */
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#define PGT_CACHE_LOW 25
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#define PGT_CACHE_HIGH 50
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kmem_cache_t *pgtable_cache __read_mostly;
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#ifndef CONFIG_SMP
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struct pgtable_cache_struct pgt_quicklists;
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#endif
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void check_pgt_cache(void)
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static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
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{
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preempt_disable();
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if (pgtable_cache_size > PGT_CACHE_HIGH) {
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do {
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if (pgd_quicklist)
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free_pgd_slow(get_pgd_fast());
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if (pte_quicklist)
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free_pte_slow(pte_alloc_one_fast());
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} while (pgtable_cache_size > PGT_CACHE_LOW);
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clear_page(addr);
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}
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void pgtable_cache_init(void)
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{
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pgtable_cache = kmem_cache_create("pgtable_cache",
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PAGE_SIZE, PAGE_SIZE,
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SLAB_HWCACHE_ALIGN |
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SLAB_MUST_HWCACHE_ALIGN,
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zero_ctor,
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NULL);
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if (!pgtable_cache) {
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prom_printf("pgtable_cache_init(): Could not create!\n");
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prom_halt();
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}
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preempt_enable();
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}
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#ifdef CONFIG_DEBUG_DCFLUSH
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@ -340,7 +339,6 @@ void show_mem(void)
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nr_swap_pages << (PAGE_SHIFT-10));
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printk("%ld pages of RAM\n", num_physpages);
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printk("%d free pages\n", nr_free_pages());
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printk("%d pages in page table cache\n",pgtable_cache_size);
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}
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void mmu_info(struct seq_file *m)
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@ -17,14 +17,7 @@ typedef struct {
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unsigned long clock_tick; /* %tick's per second */
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unsigned long udelay_val;
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/* Dcache line 2 */
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unsigned int pgcache_size;
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unsigned int __pad1;
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unsigned long *pte_cache;
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unsigned long *pgd_cache;
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unsigned long __pad2;
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/* Dcache line 3, rarely used */
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/* Dcache line 2, rarely used */
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unsigned int dcache_size;
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unsigned int dcache_line_size;
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unsigned int icache_size;
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@ -6,6 +6,7 @@
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <asm/spitfire.h>
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#include <asm/cpudata.h>
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@ -13,164 +14,59 @@
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#include <asm/page.h>
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/* Page table allocation/freeing. */
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#ifdef CONFIG_SMP
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/* Sliiiicck */
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#define pgt_quicklists local_cpu_data()
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#else
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extern struct pgtable_cache_struct {
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unsigned long *pgd_cache;
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unsigned long *pte_cache;
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unsigned int pgcache_size;
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} pgt_quicklists;
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#endif
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#define pgd_quicklist (pgt_quicklists.pgd_cache)
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#define pte_quicklist (pgt_quicklists.pte_cache)
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#define pgtable_cache_size (pgt_quicklists.pgcache_size)
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extern kmem_cache_t *pgtable_cache;
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static inline void free_pgd_fast(pgd_t *pgd)
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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preempt_disable();
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*(unsigned long *)pgd = (unsigned long) pgd_quicklist;
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pgd_quicklist = (unsigned long *) pgd;
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pgtable_cache_size++;
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preempt_enable();
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return kmem_cache_alloc(pgtable_cache, GFP_KERNEL);
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}
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static inline pgd_t *get_pgd_fast(void)
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static inline void pgd_free(pgd_t *pgd)
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{
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unsigned long *ret;
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preempt_disable();
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if((ret = pgd_quicklist) != NULL) {
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pgd_quicklist = (unsigned long *)(*ret);
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ret[0] = 0;
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pgtable_cache_size--;
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preempt_enable();
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} else {
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preempt_enable();
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ret = (unsigned long *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
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if(ret)
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memset(ret, 0, PAGE_SIZE);
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}
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return (pgd_t *)ret;
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}
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static inline void free_pgd_slow(pgd_t *pgd)
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{
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free_page((unsigned long)pgd);
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kmem_cache_free(pgtable_cache, pgd);
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}
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#define pud_populate(MM, PUD, PMD) pud_set(PUD, PMD)
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static inline pmd_t *pmd_alloc_one_fast(void)
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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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unsigned long *ret;
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preempt_disable();
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ret = (unsigned long *) pte_quicklist;
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if (likely(ret)) {
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pte_quicklist = (unsigned long *)(*ret);
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ret[0] = 0;
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pgtable_cache_size--;
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}
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preempt_enable();
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return (pmd_t *) ret;
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return kmem_cache_alloc(pgtable_cache,
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GFP_KERNEL|__GFP_REPEAT);
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}
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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static inline void pmd_free(pmd_t *pmd)
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{
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pmd_t *pmd;
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pmd = pmd_alloc_one_fast();
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if (unlikely(!pmd)) {
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pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
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if (pmd)
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memset(pmd, 0, PAGE_SIZE);
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}
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return pmd;
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kmem_cache_free(pgtable_cache, pmd);
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}
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static inline void free_pmd_fast(pmd_t *pmd)
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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preempt_disable();
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*(unsigned long *)pmd = (unsigned long) pte_quicklist;
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pte_quicklist = (unsigned long *) pmd;
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pgtable_cache_size++;
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preempt_enable();
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return kmem_cache_alloc(pgtable_cache,
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GFP_KERNEL|__GFP_REPEAT);
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}
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static inline void free_pmd_slow(pmd_t *pmd)
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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free_page((unsigned long)pmd);
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return virt_to_page(pte_alloc_one_kernel(mm, address));
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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kmem_cache_free(pgtable_cache, pte);
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}
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static inline void pte_free(struct page *ptepage)
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{
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pte_free_kernel(page_address(ptepage));
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}
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#define pmd_populate_kernel(MM, PMD, PTE) pmd_set(PMD, PTE)
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#define pmd_populate(MM,PMD,PTE_PAGE) \
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pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
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static inline pte_t *pte_alloc_one_fast(void)
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{
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unsigned long *ret;
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preempt_disable();
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ret = (unsigned long *) pte_quicklist;
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if (likely(ret)) {
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pte_quicklist = (unsigned long *)(*ret);
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ret[0] = 0;
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pgtable_cache_size--;
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}
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preempt_enable();
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return (pte_t *) ret;
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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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pte_t *ptep = pte_alloc_one_fast();
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if (likely(ptep))
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return ptep;
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return (pte_t *) get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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pte_t *pte = pte_alloc_one_fast();
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if (likely(pte))
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return virt_to_page(pte);
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return alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
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}
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static inline void free_pte_fast(pte_t *pte)
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{
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preempt_disable();
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*(unsigned long *)pte = (unsigned long) pte_quicklist;
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pte_quicklist = (unsigned long *) pte;
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pgtable_cache_size++;
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preempt_enable();
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}
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static inline void free_pte_slow(pte_t *pte)
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{
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free_page((unsigned long) pte);
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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free_pte_fast(pte);
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}
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static inline void pte_free(struct page *ptepage)
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{
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free_pte_fast(page_address(ptepage));
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}
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#define pmd_free(pmd) free_pmd_fast(pmd)
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#define pgd_free(pgd) free_pgd_fast(pgd)
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#define pgd_alloc(mm) get_pgd_fast()
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#define check_pgt_cache() do { } while (0)
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#endif /* _SPARC64_PGALLOC_H */
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@ -432,12 +432,7 @@ extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
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unsigned long);
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#define HAVE_ARCH_FB_UNMAPPED_AREA
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/*
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* No page table caches to initialise
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*/
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#define pgtable_cache_init() do { } while (0)
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extern void check_pgt_cache(void);
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extern void pgtable_cache_init(void);
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#endif /* !(__ASSEMBLY__) */
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