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Code Issues Releases Activity

Passing a parameter to vm_map_entry_resize_free that describes the

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amount of resizing reduces the number of functions changing the vm_map
invariants regarding the max_free field of map entries.

Reviewed by: markj (mentor)
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D20356
This commit is contained in:
Doug Moore 2019-05-22 17:40:54 +00:00
parent f9039ad43e
commit 1895f5202a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348115
1 changed files with 11 additions and 12 deletions
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23
sys/vm/vm_map.c
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@ -1251,7 +1251,7 @@ vm_map_entry_unlink(vm_map_t map,
* The map must be locked, and leaves it so.
*/
static void
vm_map_entry_resize_free(vm_map_t map, vm_map_entry_t entry)
vm_map_entry_resize_free(vm_map_t map, vm_map_entry_t entry, size_t grow_amount)
{
vm_map_entry_t llist, rlist, root;
@ -1262,11 +1262,12 @@ vm_map_entry_resize_free(vm_map_t map, vm_map_entry_t entry)
("vm_map_entry_resize_free: resize_free object not mapped"));
vm_map_splay_findnext(root, &rlist);
root->right = NULL;
entry->end += grow_amount;
map->root = vm_map_splay_merge(root, llist, rlist,
root->left, root->right);
VM_MAP_ASSERT_CONSISTENT(map);
CTR3(KTR_VM, "vm_map_entry_resize_free: map %p, nentries %d, entry %p", map,
map->nentries, entry);
CTR3(KTR_VM, "vm_map_entry_resize_free: map %p, nentries %d, entry %p",
map, map->nentries, entry);
}
/*
@ -1486,8 +1487,8 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
prev_entry));
if ((prev_entry->eflags & MAP_ENTRY_GUARD) == 0)
map->size += end - prev_entry->end;
prev_entry->end = end;
vm_map_entry_resize_free(map, prev_entry);
vm_map_entry_resize_free(map, prev_entry,
end - prev_entry->end);
vm_map_simplify_entry(map, prev_entry);
return (KERN_SUCCESS);
}
@ -4314,7 +4315,7 @@ vm_map_growstack(vm_map_t map, vm_offset_t addr, vm_map_entry_t gap_entry)
} else {
MPASS(gap_entry->start < gap_entry->end - grow_amount);
gap_entry->end -= grow_amount;
vm_map_entry_resize_free(map, gap_entry);
vm_map_entry_resize_free(map, gap_entry, -grow_amount);
gap_deleted = false;
}
rv = vm_map_insert(map, NULL, 0, grow_start,
@ -4327,10 +4328,9 @@ vm_map_growstack(vm_map_t map, vm_offset_t addr, vm_map_entry_t gap_entry)
gap_end, VM_PROT_NONE, VM_PROT_NONE,
MAP_CREATE_GUARD | MAP_CREATE_STACK_GAP_DN);
MPASS(rv1 == KERN_SUCCESS);
} else {
gap_entry->end += grow_amount;
vm_map_entry_resize_free(map, gap_entry);
}
} else
vm_map_entry_resize_free(map, gap_entry,
grow_amount);
}
} else {
grow_start = stack_entry->end;
@ -4349,9 +4349,8 @@ vm_map_growstack(vm_map_t map, vm_offset_t addr, vm_map_entry_t gap_entry)
vm_map_entry_delete(map, gap_entry);
else
gap_entry->start += grow_amount;
stack_entry->end += grow_amount;
map->size += grow_amount;
vm_map_entry_resize_free(map, stack_entry);
vm_map_entry_resize_free(map, stack_entry, grow_amount);
rv = KERN_SUCCESS;
} else
rv = KERN_FAILURE;