mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 09:46:43 +07:00
312fcae227
This patch provides core functions for migration of zsmalloc. Migraion
policy is simple as follows.
for each size class {
while {
src_page = get zs_page from ZS_ALMOST_EMPTY
if (!src_page)
break;
dst_page = get zs_page from ZS_ALMOST_FULL
if (!dst_page)
dst_page = get zs_page from ZS_ALMOST_EMPTY
if (!dst_page)
break;
migrate(from src_page, to dst_page);
}
}
For migration, we need to identify which objects in zspage are allocated
to migrate them out. We could know it by iterating of freed objects in a
zspage because first_page of zspage keeps free objects singly-linked list
but it's not efficient. Instead, this patch adds a tag(ie,
OBJ_ALLOCATED_TAG) in header of each object(ie, handle) so we could check
whether the object is allocated easily.
This patch adds another status bit in handle to synchronize between user
access through zs_map_object and migration. During migration, we cannot
move objects user are using due to data coherency between old object and
new object.
[akpm@linux-foundation.org: zsmalloc.c needs sched.h for cond_resched()]
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Juneho Choi <juno.choi@lge.com>
Cc: Gunho Lee <gunho.lee@lge.com>
Cc: Luigi Semenzato <semenzato@google.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
53 lines
1.5 KiB
C
53 lines
1.5 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;
|
|
|
|
struct zs_pool *zs_create_pool(char *name, gfp_t flags);
|
|
void zs_destroy_pool(struct zs_pool *pool);
|
|
|
|
unsigned long zs_malloc(struct zs_pool *pool, size_t size);
|
|
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);
|
|
|
|
#endif
|