Commit 6e76668e authored by Sergey Senozhatsky's avatar Sergey Senozhatsky Committed by Linus Torvalds
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zram: add lz4 algorithm backend 

Introduce LZ4 compression backend and make it available for selection.
LZ4 support is optional and requires user to set ZRAM_LZ4_COMPRESS config
option.  The default compression backend is LZO.

TEST

(x86_64, core i5, 2 cores + 2 hyperthreading, zram disk size 1G,
ext4 file system, 3 compression streams)

iozone -t 3 -R -r 16K -s 60M -I +Z

       Test           LZO           LZ4
----------------------------------------------
  Initial write   1642744.62    1317005.09
        Rewrite   2498980.88    1800645.16
           Read   3957026.38    5877043.75
        Re-read   3950997.38    5861847.00
   Reverse Read   2937114.56    5047384.00
    Stride read   2948163.19    4929587.38
    Random read   3292692.69    4880793.62
 Mixed workload   1545602.62    3502940.38
   Random write   2448039.75    1758786.25
         Pwrite   1670051.03    1338329.69
          Pread   2530682.00    5097177.62
         Fwrite   3232085.62    3275942.56
          Fread   6306880.25    6645271.12

So on my system LZ4 is slower in write-only tests, while it performs
better in read-only and mixed (reads + writes) tests.

Official LZ4 benchmarks available here http://code.google.com/p/lz4/


(linux kernel uses revision r90).

Signed-off-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e46b8a03

drivers/block/zram/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -15,6 +15,16 @@ config ZRAM 


	  See zram.txt for more information.



config ZRAM_LZ4_COMPRESS

	bool "Enable LZ4 algorithm support"

	depends on ZRAM

	select LZ4_COMPRESS

	select LZ4_DECOMPRESS

	default n

	help

	  This option enables LZ4 compression algorithm support. Compression

	  algorithm can be changed using `comp_algorithm' device attribute.



config ZRAM_DEBUG

	bool "Compressed RAM block device debug support"

	depends on ZRAM

drivers/block/zram/Makefile

+2 −0
Original line number Diff line number Diff line 
zram-y	:=	zcomp_lzo.o zcomp.o zram_drv.o



zram-$(CONFIG_ZRAM_LZ4_COMPRESS) += zcomp_lz4.o



obj-$(CONFIG_ZRAM)	+=	zram.o

drivers/block/zram/zcomp.c

+6 −0
Original line number Diff line number Diff line
@@ -15,6 +15,9 @@ 


#include "zcomp.h"

#include "zcomp_lzo.h"

#ifdef CONFIG_ZRAM_LZ4_COMPRESS

#include "zcomp_lz4.h"

#endif



/*

 * single zcomp_strm backend
@@ -41,6 +44,9 @@ struct zcomp_strm_multi { 


static struct zcomp_backend *backends[] = {

	&zcomp_lzo,

#ifdef CONFIG_ZRAM_LZ4_COMPRESS

	&zcomp_lz4,

#endif

	NULL

};

drivers/block/zram/zcomp_lz4.c

0 → 100644
+47 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Sergey Senozhatsky.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */



#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/lz4.h>



#include "zcomp_lz4.h"



static void *zcomp_lz4_create(void)

{

	return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);

}



static void zcomp_lz4_destroy(void *private)

{

	kfree(private);

}



static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst,

		size_t *dst_len, void *private)

{

	/* return  : Success if return 0 */

	return lz4_compress(src, PAGE_SIZE, dst, dst_len, private);

}



static int zcomp_lz4_decompress(const unsigned char *src, size_t src_len,

		unsigned char *dst)

{

	size_t dst_len = PAGE_SIZE;

	/* return  : Success if return 0 */

	return lz4_decompress_unknownoutputsize(src, src_len, dst, &dst_len);

}



struct zcomp_backend zcomp_lz4 = {

	.compress = zcomp_lz4_compress,

	.decompress = zcomp_lz4_decompress,

	.create = zcomp_lz4_create,

	.destroy = zcomp_lz4_destroy,

	.name = "lz4",

};

drivers/block/zram/zcomp_lz4.h

0 → 100644
+17 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Sergey Senozhatsky.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */



#ifndef _ZCOMP_LZ4_H_

#define _ZCOMP_LZ4_H_



#include "zcomp.h"



extern struct zcomp_backend zcomp_lz4;



#endif /* _ZCOMP_LZ4_H_ */

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