mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Sergey Senozhatsky](/assets/img/avatar_default.png)
Pass GFP flags to zs_malloc() instead of using a fixed mask supplied to zs_create_pool(), so we can be more flexible, but, more importantly, we need this to switch zram to per-cpu compression streams -- zram will try to allocate handle with preemption disabled in a fast path and switch to a slow path (using different gfp mask) if the fast one has failed. Apart from that, this also align zs_malloc() interface with zspool/zbud. [sergey.senozhatsky@gmail.com: pass GFP flags to zs_malloc() instead of using a fixed mask] Link: http://lkml.kernel.org/r/20160429150942.GA637@swordfish Link: http://lkml.kernel.org/r/20160429150942.GA637@swordfish Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
|
|
* zsmalloc memory allocator
|
|
*
|
|
* Copyright (C) 2011 Nitin Gupta
|
|
* Copyright (C) 2012, 2013 Minchan Kim
|
|
*
|
|
* This code is released using a dual license strategy: BSD/GPL
|
|
* You can choose the license that better fits your requirements.
|
|
*
|
|
* Released under the terms of 3-clause BSD License
|
|
* Released under the terms of GNU General Public License Version 2.0
|
|
*/
|
|
|
|
#ifndef _ZS_MALLOC_H_
|
|
#define _ZS_MALLOC_H_
|
|
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* zsmalloc mapping modes
|
|
*
|
|
* NOTE: These only make a difference when a mapped object spans pages.
|
|
* They also have no effect when PGTABLE_MAPPING is selected.
|
|
*/
|
|
enum zs_mapmode {
|
|
ZS_MM_RW, /* normal read-write mapping */
|
|
ZS_MM_RO, /* read-only (no copy-out at unmap time) */
|
|
ZS_MM_WO /* write-only (no copy-in at map time) */
|
|
/*
|
|
* NOTE: ZS_MM_WO should only be used for initializing new
|
|
* (uninitialized) allocations. Partial writes to already
|
|
* initialized allocations should use ZS_MM_RW to preserve the
|
|
* existing data.
|
|
*/
|
|
};
|
|
|
|
struct zs_pool_stats {
|
|
/* How many pages were migrated (freed) */
|
|
unsigned long pages_compacted;
|
|
};
|
|
|
|
struct zs_pool;
|
|
|
|
struct zs_pool *zs_create_pool(const char *name);
|
|
void zs_destroy_pool(struct zs_pool *pool);
|
|
|
|
unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags);
|
|
void zs_free(struct zs_pool *pool, unsigned long obj);
|
|
|
|
void *zs_map_object(struct zs_pool *pool, unsigned long handle,
|
|
enum zs_mapmode mm);
|
|
void zs_unmap_object(struct zs_pool *pool, unsigned long handle);
|
|
|
|
unsigned long zs_get_total_pages(struct zs_pool *pool);
|
|
unsigned long zs_compact(struct zs_pool *pool);
|
|
|
|
void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats);
|
|
#endif
|