7d3f393823
`zs_compact_control' accounts the number of migrated objects but it has a limited lifespan -- we lose it as soon as zs_compaction() returns back to zram. It worked fine, because (a) zram had it's own counter of migrated objects and (b) only zram could trigger compaction. However, this does not work for automatic pool compaction (not issued by zram). To account objects migrated during auto-compaction (issued by the shrinker) we need to store this number in zs_pool. Define a new `struct zs_pool_stats' structure to keep zs_pool's stats there. It provides only `num_migrated', as of this writing, but it surely can be extended. A new zsmalloc zs_pool_stats() symbol exports zs_pool's stats back to caller. Use zs_pool_stats() in zram and remove `num_migrated' from zram_stats. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Suggested-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
/*
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* zsmalloc memory allocator
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*
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* Copyright (C) 2011 Nitin Gupta
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* Copyright (C) 2012, 2013 Minchan Kim
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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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/*
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* zsmalloc mapping modes
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*
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* NOTE: These only make a difference when a mapped object spans pages.
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* They also have no effect when PGTABLE_MAPPING is selected.
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*/
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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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/*
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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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};
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struct zs_pool_stats {
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/* How many objects were migrated */
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unsigned long num_migrated;
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};
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struct zs_pool;
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struct zs_pool *zs_create_pool(char *name, gfp_t flags);
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void zs_destroy_pool(struct zs_pool *pool);
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unsigned long zs_malloc(struct zs_pool *pool, size_t size);
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void zs_free(struct zs_pool *pool, unsigned long obj);
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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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void zs_unmap_object(struct zs_pool *pool, unsigned long handle);
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unsigned long zs_get_total_pages(struct zs_pool *pool);
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unsigned long zs_compact(struct zs_pool *pool);
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void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats);
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#endif
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