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* libpager/pager-memcpy.c (pager_memcpy): Reset address passed to vm_map
on each loop, to avoid potentially monotonically increasing up to
VM_MAX_ADDRESS.
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Some versions of gnumach actually take address as a mapping hint, and would fail
if the hint is bogus. Make sure to pass 0 for those versions.
* console/pager.c (user_pager_create): Make sure to set *user to 0 before
calling vm_map.
* libdiskfs/disk-pager.c (diskfs_start_disk_pager): Make sure to set *image to 0
before calling vm_map.
* libpager/pager-memcpy.c (pager_memcpy): Set window to 0 before calling
vm_map.
* tmpfs/node.c (diskfs_get_filemap): Make sure to set np->dn->u.reg.memref to 0
before calling vm_map.
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* libpager/pager-memcpy.c (VMCOPY_BETTER_THAN_MEMCPY): Increase to 8 pages.
(VMCOPY_WINDOW_DEFAULT_SIZE, MEMCPY_WINDOW_DEFAULT_SIZE): Increase to 32 pages.
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* pager-memcpy.c (pager_memcpy): Pass not the block but the byte
offset of the page in question to pager_get_error.
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* pager-memcpy.c (VMCOPY_BETTER_THAN_MEMCPY): New macro.
(pager_memcpy): Rewritten to use vmcopy.
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* pager-memcpy.c: Include <string.h> for memcpy decl.
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* pager-memcpy.c (pager_memcpy): Short-circuit return for zero size.
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* priv.h: Add #include <sys/mman.h> for munmap decl.
* pager-memcpy.c: Likewise.
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* data-return.c (_pager_do_write_request): Use munmap instead of
vm_deallocate.
* object-terminate.c (_pager_free_structure): Likewise.
* pagemap.c (_pager_pagemap_resize): Likewise.
* pager-memcpy.c (pager_memcpy): Likewise.
* pager.h (pager_write_page): Doc adjustment.
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`preempter' -> `preemptor'.
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