98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* Routines and structures for building a bitmap of
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* dirty pages in a live system. For use in memory mirroring
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* or migration applications.
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*
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* Copyright (C) 2006 Stratus Technologies Bermuda Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __X86_64_MMTRACK_H__
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#define __X86_64_MMTRACK_H__
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#ifndef CONFIG_TRACK_DIRTY_PAGES
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static inline void mm_track_pte(pte_t *ptep) {}
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static inline void mm_track_pmd(pmd_t *pmdp) {}
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static inline void mm_track_pud(pud_t *pudp) {}
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static inline void mm_track_pgd(pgd_t *pgdp) {}
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static inline void mm_track_phys(void *physp) {}
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#else
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#include <asm/page.h>
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#include <asm/atomic.h>
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/*
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* For memory-tracking purposes, if active is true (non-zero), the other
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* elements of the structure are available for use. Each time mm_track_pte
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* is called, it increments count and sets a bit in the bitvector table.
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* Each bit in the bitvector represents a physical page in memory.
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*
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* This is declared in arch/x86_64/mm/track.c.
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*
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* The in_use element is used in the code which drives the memory tracking
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* environment. When tracking is complete, the vector may be freed, but
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* only after the active flag is set to zero and the in_use count goes to
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* zero.
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*
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* The count element indicates how many pages have been stored in the
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* bitvector. This is an optimization to avoid counting the bits in the
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* vector between harvest operations.
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*/
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struct mm_tracker {
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int active; // non-zero if this structure in use
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atomic_t count; // number of pages tracked by mm_track()
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unsigned long * vector; // bit vector of modified pages
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unsigned long bitcnt; // number of bits in vector
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};
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extern struct mm_tracker mm_tracking_struct;
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extern void do_mm_track_pte(void *);
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extern void do_mm_track_pmd(void *);
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extern void do_mm_track_pud(void *);
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extern void do_mm_track_pgd(void *);
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extern void do_mm_track_phys(void *);
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/*
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* The mm_track routine is needed by macros in pgtable.h
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*/
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static __inline__ void mm_track_pte(pte_t *ptep)
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{
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if (unlikely(mm_tracking_struct.active))
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do_mm_track_pte(ptep);
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}
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static __inline__ void mm_track_pmd(pmd_t *pmdp)
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{
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if (unlikely(mm_tracking_struct.active))
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do_mm_track_pmd(pmdp);
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}
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static __inline__ void mm_track_pud(pud_t *pudp)
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{
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if (unlikely(mm_tracking_struct.active))
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do_mm_track_pud(pudp);
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}
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static __inline__ void mm_track_pgd(pgd_t *pgdp)
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{
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if (unlikely(mm_tracking_struct.active))
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do_mm_track_pgd(pgdp);
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}
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static __inline__ void mm_track_phys(void *physp)
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{
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if (unlikely(mm_tracking_struct.active))
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do_mm_track_phys(physp);
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}
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#endif /* CONFIG_TRACK_DIRTY_PAGES */
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#endif /* __X86_64_MMTRACK_H__ */
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