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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
#ifndef __ASMARM_TLB_H
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#define __ASMARM_TLB_H
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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/*
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* TLB handling. This allows us to remove pages from the page
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* tables, and efficiently handle the TLB issues.
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*/
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struct mmu_gather {
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struct mm_struct *mm;
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unsigned int need_flush;
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unsigned int fullmm;
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};
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DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
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static inline struct mmu_gather *
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tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
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{
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struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
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tlb->mm = mm;
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tlb->need_flush = 0;
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tlb->fullmm = full_mm_flush;
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return tlb;
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}
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static inline void
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tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
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{
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if (tlb->need_flush)
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flush_tlb_mm(tlb->mm);
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/* keep the page table cache within bounds */
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check_pgt_cache();
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put_cpu_var(mmu_gathers);
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}
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#define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0)
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//#define tlb_start_vma(tlb,vma) do { } while (0)
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//FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling...
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#define tlb_start_vma(tlb,vma) \
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do { \
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if (!tlb->fullmm) \
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flush_cache_range(vma, vma->vm_start, vma->vm_end); \
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} while (0)
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#define tlb_end_vma(tlb,vma) do { } while (0)
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static inline void
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tlb_remove_page(struct mmu_gather *tlb, struct page *page)
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{
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tlb->need_flush = 1;
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free_page_and_swap_cache(page);
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}
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#define pte_free_tlb(tlb,ptep) pte_free(ptep)
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#define pmd_free_tlb(tlb,pmdp) pmd_free(pmdp)
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#endif
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