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https://github.com/torvalds/linux
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fc2acab31b
zap_pte_range has been counting the pages it frees in tlb->freed, then tlb_finish_mmu has used that to update the mm's rss. That got stranger when I added anon_rss, yet updated it by a different route; and stranger when rss and anon_rss became mm_counters with special access macros. And it would no longer be viable if we're relying on page_table_lock to stabilize the mm_counter, but calling tlb_finish_mmu outside that lock. Remove the mmu_gather's freed field, let tlb_finish_mmu stick to its own business, just decrement the rss mm_counter in zap_pte_range (yes, there was some point to batching the update, and a subsequent patch restores that). And forget the anal paranoia of first reading the counter to avoid going negative - if rss does go negative, just fix that bug. Remove the mmu_gather's flushes and avoided_flushes from arm and arm26: no use was being made of them. But arm26 alone was actually using the freed, in the way some others use need_flush: give it a need_flush. arm26 seems to prefer spaces to tabs here: respect that. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
/* arch/sparc64/mm/tlb.c
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*
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* Copyright (C) 2004 David S. Miller <davem@redhat.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/percpu.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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/* Heavily inspired by the ppc64 code. */
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers) = { 0, };
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void flush_tlb_pending(void)
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{
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struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
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if (mp->tlb_nr) {
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if (CTX_VALID(mp->mm->context)) {
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#ifdef CONFIG_SMP
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smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
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&mp->vaddrs[0]);
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#else
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__flush_tlb_pending(CTX_HWBITS(mp->mm->context),
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mp->tlb_nr, &mp->vaddrs[0]);
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#endif
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}
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mp->tlb_nr = 0;
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}
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}
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void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)
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{
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struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
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unsigned long nr;
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vaddr &= PAGE_MASK;
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if (pte_exec(orig))
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vaddr |= 0x1UL;
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if (pte_dirty(orig)) {
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unsigned long paddr, pfn = pte_pfn(orig);
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struct address_space *mapping;
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struct page *page;
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if (!pfn_valid(pfn))
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goto no_cache_flush;
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page = pfn_to_page(pfn);
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if (PageReserved(page))
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goto no_cache_flush;
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/* A real file page? */
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mapping = page_mapping(page);
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if (!mapping)
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goto no_cache_flush;
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paddr = (unsigned long) page_address(page);
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if ((paddr ^ vaddr) & (1 << 13))
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flush_dcache_page_all(mm, page);
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}
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no_cache_flush:
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if (mp->fullmm)
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return;
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nr = mp->tlb_nr;
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if (unlikely(nr != 0 && mm != mp->mm)) {
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flush_tlb_pending();
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nr = 0;
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}
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if (nr == 0)
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mp->mm = mm;
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mp->vaddrs[nr] = vaddr;
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mp->tlb_nr = ++nr;
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if (nr >= TLB_BATCH_NR)
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flush_tlb_pending();
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}
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void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
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{
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struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
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unsigned long nr = mp->tlb_nr;
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long s = start, e = end, vpte_base;
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if (mp->fullmm)
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return;
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/* If start is greater than end, that is a real problem. */
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BUG_ON(start > end);
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/* However, straddling the VA space hole is quite normal. */
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s &= PMD_MASK;
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e = (e + PMD_SIZE - 1) & PMD_MASK;
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vpte_base = (tlb_type == spitfire ?
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VPTE_BASE_SPITFIRE :
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VPTE_BASE_CHEETAH);
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if (unlikely(nr != 0 && mm != mp->mm)) {
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flush_tlb_pending();
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nr = 0;
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}
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if (nr == 0)
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mp->mm = mm;
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start = vpte_base + (s >> (PAGE_SHIFT - 3));
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end = vpte_base + (e >> (PAGE_SHIFT - 3));
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/* If the request straddles the VA space hole, we
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* need to swap start and end. The reason this
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* occurs is that "vpte_base" is the center of
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* the linear page table mapping area. Thus,
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* high addresses with the sign bit set map to
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* addresses below vpte_base and non-sign bit
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* addresses map to addresses above vpte_base.
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*/
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if (end < start) {
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unsigned long tmp = start;
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start = end;
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end = tmp;
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}
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while (start < end) {
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mp->vaddrs[nr] = start;
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mp->tlb_nr = ++nr;
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if (nr >= TLB_BATCH_NR) {
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flush_tlb_pending();
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nr = 0;
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}
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start += PAGE_SIZE;
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}
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if (nr)
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flush_tlb_pending();
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}
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