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https://github.com/moparisthebest/pacman
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bb3dada871
This accomplishes quite a few things with one rather invasive change.
1. Iteration is much more performant, due to a reduction in pointer
chasing and linear item access.
2. Data structures are smaller- we no longer have the overhead of the
linked list as the file struts are now laid out consecutively in
memory.
3. Memory allocation has been massively reworked. Before, we would
allocate three different pieces of memory per file item- the list
struct, the file struct, and the copied filename. What this resulted
in was massive fragmentation of memory when loading filelists since
the memory allocator had to leave holes all over the place. The new
situation here now removes the need for any list item allocation;
allocates the file structs in contiguous memory (and reallocs as
necessary), leaving only the strings as individually allocated. Tests
using valgrind (massif) show some pretty significant memory
reductions on the worst case `pacman -Ql > /dev/null` (366387 files
on my machine):
Before:
Peak heap: 54,416,024 B
Useful heap: 36,840,692 B
Extra heap: 17,575,332 B
After:
Peak heap: 38,004,352 B
Useful heap: 28,101,347 B
Extra heap: 9,903,005 B
Several small helper methods have been introduced, including a list to
array conversion helper as well as a filelist merge sort that works
directly on arrays.
Signed-off-by: Dan McGee <dan@archlinux.org>
92 lines
3.7 KiB
C
92 lines
3.7 KiB
C
/*
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* alpm_list.h
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*
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* Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
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* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
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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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ALPM_LIST_H
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#define _ALPM_LIST_H
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#include <stdlib.h> /* size_t */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Linked list type used by libalpm.
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*
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* It is exposed so front ends can use it to prevent the need to reimplement
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* lists of their own; however, it is not required that the front end uses
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* it.
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*/
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typedef struct __alpm_list_t {
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/** data held by the list node */
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void *data;
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/** pointer to the previous node */
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struct __alpm_list_t *prev;
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/** pointer to the next node */
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struct __alpm_list_t *next;
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} alpm_list_t;
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#define FREELIST(p) do { alpm_list_free_inner(p, free); alpm_list_free(p); p = NULL; } while(0)
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typedef void (*alpm_list_fn_free)(void *); /* item deallocation callback */
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typedef int (*alpm_list_fn_cmp)(const void *, const void *); /* item comparison callback */
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/* allocation */
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void alpm_list_free(alpm_list_t *list);
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void alpm_list_free_inner(alpm_list_t *list, alpm_list_fn_free fn);
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/* item mutators */
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alpm_list_t *alpm_list_add(alpm_list_t *list, void *data);
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alpm_list_t *alpm_list_add_sorted(alpm_list_t *list, void *data, alpm_list_fn_cmp fn);
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alpm_list_t *alpm_list_join(alpm_list_t *first, alpm_list_t *second);
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alpm_list_t *alpm_list_mmerge(alpm_list_t *left, alpm_list_t *right, alpm_list_fn_cmp fn);
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alpm_list_t *alpm_list_msort(alpm_list_t *list, size_t n, alpm_list_fn_cmp fn);
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alpm_list_t *alpm_list_remove_item(alpm_list_t *haystack, alpm_list_t *item);
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alpm_list_t *alpm_list_remove(alpm_list_t *haystack, const void *needle, alpm_list_fn_cmp fn, void **data);
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alpm_list_t *alpm_list_remove_str(alpm_list_t *haystack, const char *needle, char **data);
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alpm_list_t *alpm_list_remove_dupes(const alpm_list_t *list);
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alpm_list_t *alpm_list_strdup(const alpm_list_t *list);
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alpm_list_t *alpm_list_copy(const alpm_list_t *list);
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alpm_list_t *alpm_list_copy_data(const alpm_list_t *list, size_t size);
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alpm_list_t *alpm_list_reverse(alpm_list_t *list);
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/* item accessors */
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alpm_list_t *alpm_list_nth(const alpm_list_t *list, size_t n);
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alpm_list_t *alpm_list_next(const alpm_list_t *list);
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alpm_list_t *alpm_list_previous(const alpm_list_t *list);
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alpm_list_t *alpm_list_last(const alpm_list_t *list);
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void *alpm_list_getdata(const alpm_list_t *entry);
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/* misc */
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size_t alpm_list_count(const alpm_list_t *list);
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void *alpm_list_find(const alpm_list_t *haystack, const void *needle, alpm_list_fn_cmp fn);
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void *alpm_list_find_ptr(const alpm_list_t *haystack, const void *needle);
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char *alpm_list_find_str(const alpm_list_t *haystack, const char *needle);
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alpm_list_t *alpm_list_diff(const alpm_list_t *lhs, const alpm_list_t *rhs, alpm_list_fn_cmp fn);
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void alpm_list_diff_sorted(const alpm_list_t *left, const alpm_list_t *right,
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alpm_list_fn_cmp fn, alpm_list_t **onlyleft, alpm_list_t **onlyright);
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void *alpm_list_to_array(const alpm_list_t *list, size_t n, size_t size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ALPM_LIST_H */
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/* vim: set ts=2 sw=2 noet: */
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