2012-01-09 22:51:56 +00:00
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/*
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* zsmalloc memory allocator
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*
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* Copyright (C) 2011 Nitin Gupta
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2014-01-30 23:45:55 +00:00
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* Copyright (C) 2012, 2013 Minchan Kim
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2012-01-09 22:51:56 +00:00
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*
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* This code is released using a dual license strategy: BSD/GPL
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* You can choose the license that better fits your requirements.
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*
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* Released under the terms of 3-clause BSD License
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* Released under the terms of GNU General Public License Version 2.0
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*/
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#ifndef _ZS_MALLOC_H_
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#define _ZS_MALLOC_H_
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#include <linux/types.h>
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2012-07-02 21:15:52 +00:00
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/*
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* zsmalloc mapping modes
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*
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2013-12-11 02:04:37 +00:00
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* NOTE: These only make a difference when a mapped object spans pages.
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2020-06-02 04:50:53 +00:00
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* They also have no effect when ZSMALLOC_PGTABLE_MAPPING is selected.
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2013-05-20 19:18:14 +00:00
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*/
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2012-07-02 21:15:52 +00:00
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enum zs_mapmode {
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ZS_MM_RW, /* normal read-write mapping */
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ZS_MM_RO, /* read-only (no copy-out at unmap time) */
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ZS_MM_WO /* write-only (no copy-in at map time) */
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2013-12-11 02:04:37 +00:00
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/*
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* NOTE: ZS_MM_WO should only be used for initializing new
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* (uninitialized) allocations. Partial writes to already
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* initialized allocations should use ZS_MM_RW to preserve the
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* existing data.
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*/
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2012-07-02 21:15:52 +00:00
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};
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2015-09-08 22:04:35 +00:00
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struct zs_pool_stats {
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2015-09-08 22:04:38 +00:00
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/* How many pages were migrated (freed) */
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unsigned long pages_compacted;
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2015-09-08 22:04:35 +00:00
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};
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2012-01-09 22:51:56 +00:00
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struct zs_pool;
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2016-05-20 23:59:48 +00:00
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struct zs_pool *zs_create_pool(const char *name);
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2012-01-09 22:51:56 +00:00
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void zs_destroy_pool(struct zs_pool *pool);
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2016-05-20 23:59:48 +00:00
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unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags);
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2012-06-08 06:39:25 +00:00
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void zs_free(struct zs_pool *pool, unsigned long obj);
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2012-01-09 22:51:56 +00:00
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zsmalloc: introduce zs_huge_class_size()
Patch series "zsmalloc/zram: drop zram's max_zpage_size", v3.
ZRAM's max_zpage_size is a bad thing. It forces zsmalloc to store
normal objects as huge ones, which results in bigger zsmalloc memory
usage. Drop it and use actual zsmalloc huge-class value when decide if
the object is huge or not.
This patch (of 2):
Not every object can be share its zspage with other objects, e.g. when
the object is as big as zspage or nearly as big a zspage. For such
objects zsmalloc has a so called huge class - every object which belongs
to huge class consumes the entire zspage (which consists of a physical
page). On x86_64, PAGE_SHIFT 12 box, the first non-huge class size is
3264, so starting down from size 3264, objects can share page(-s) and
thus minimize memory wastage.
ZRAM, however, has its own statically defined watermark for huge
objects, namely "3 * PAGE_SIZE / 4 = 3072", and forcibly stores every
object larger than this watermark (3072) as a PAGE_SIZE object, in other
words, to a huge class, while zsmalloc can keep some of those objects in
non-huge classes. This results in increased memory consumption.
zsmalloc knows better if the object is huge or not. Introduce
zs_huge_class_size() function which tells if the given object can be
stored in one of non-huge classes or not. This will let us to drop
ZRAM's huge object watermark and fully rely on zsmalloc when we decide
if the object is huge.
[sergey.senozhatsky.work@gmail.com: add pool param to zs_huge_class_size()]
Link: http://lkml.kernel.org/r/20180314081833.1096-2-sergey.senozhatsky@gmail.com
Link: http://lkml.kernel.org/r/20180306070639.7389-2-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-04-05 23:24:43 +00:00
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size_t zs_huge_class_size(struct zs_pool *pool);
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2012-07-02 21:15:52 +00:00
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void *zs_map_object(struct zs_pool *pool, unsigned long handle,
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enum zs_mapmode mm);
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2012-06-08 06:39:25 +00:00
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void zs_unmap_object(struct zs_pool *pool, unsigned long handle);
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2012-01-09 22:51:56 +00:00
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2014-10-09 22:29:50 +00:00
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unsigned long zs_get_total_pages(struct zs_pool *pool);
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2015-04-15 23:15:30 +00:00
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unsigned long zs_compact(struct zs_pool *pool);
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2012-01-09 22:51:56 +00:00
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2015-09-08 22:04:35 +00:00
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void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats);
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2012-01-09 22:51:56 +00:00
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#endif
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