mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
2aea8493d3
This has started as a 'add zlib support' work, but after some thinking I
saw no blockers for a bigger change -- a switch to crypto API.
We don't have an idle zstreams list anymore and our write path now works
absolutely differently, preventing preemption during compression. This
removes possibilities of read paths preempting writes at wrong places
and opens the door for a move from custom LZO/LZ4 compression backends
implementation to a more generic one, using crypto compress API.
This patch set also eliminates the need of a new context-less crypto API
interface, which was quite hard to sell, so we can move along faster.
benchmarks:
(x86_64, 4GB, zram-perf script)
perf reported run-time fio (max jobs=3). I performed fio test with the
increasing number of parallel jobs (max to 3) on a 3G zram device, using
`static' data and the following crypto comp algorithms:
842, deflate, lz4, lz4hc, lzo
the output was:
- test running time (which can tell us what algorithms performs faster)
and
- zram mm_stat (which tells the compressed memory size, max used memory, etc).
It's just for information. for example, LZ4HC has twice the running
time of LZO, but the compressed memory size is: 23592960 vs 34603008
bytes.
test-fio-zram-842
197.907655282 seconds time elapsed
201.623142884 seconds time elapsed
226.854291345 seconds time elapsed
test-fio-zram-DEFLATE
253.259516155 seconds time elapsed
258.148563401 seconds time elapsed
290.251909365 seconds time elapsed
test-fio-zram-LZ4
27.022598717 seconds time elapsed
29.580522717 seconds time elapsed
33.293463430 seconds time elapsed
test-fio-zram-LZ4HC
56.393954615 seconds time elapsed
74.904659747 seconds time elapsed
101.940998564 seconds time elapsed
test-fio-zram-LZO
28.155948075 seconds time elapsed
30.390036330 seconds time elapsed
34.455773159 seconds time elapsed
zram mm_stat-s (max fio jobs=3)
test-fio-zram-842
mm_stat (jobs1): 3221225472 673185792 690266112 0 690266112 0 0
mm_stat (jobs2): 3221225472 673185792 690266112 0 690266112 0 0
mm_stat (jobs3): 3221225472 673185792 690266112 0 690266112 0 0
test-fio-zram-DEFLATE
mm_stat (jobs1): 3221225472 24379392 37761024 0 37761024 0 0
mm_stat (jobs2): 3221225472 24379392 37761024 0 37761024 0 0
mm_stat (jobs3): 3221225472 24379392 37761024 0 37761024 0 0
test-fio-zram-LZ4
mm_stat (jobs1): 3221225472 23592960 37761024 0 37761024 0 0
mm_stat (jobs2): 3221225472 23592960 37761024 0 37761024 0 0
mm_stat (jobs3): 3221225472 23592960 37761024 0 37761024 0 0
test-fio-zram-LZ4HC
mm_stat (jobs1): 3221225472 23592960 37761024 0 37761024 0 0
mm_stat (jobs2): 3221225472 23592960 37761024 0 37761024 0 0
mm_stat (jobs3): 3221225472 23592960 37761024 0 37761024 0 0
test-fio-zram-LZO
mm_stat (jobs1): 3221225472 34603008 50335744 0 50335744 0 0
mm_stat (jobs2): 3221225472 34603008 50335744 0 50335744 0 0
mm_stat (jobs3): 3221225472 34603008 50335744 0 50339840 0 0
This patch (of 8):
We don't perform any zstream idle list lookup anymore, so
zcomp_strm_find()/zcomp_strm_release() names are not representative.
Rename to zcomp_stream_get()/zcomp_stream_put().
Link: http://lkml.kernel.org/r/20160531122017.2878-2-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
|
|
* 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_H_
|
|
#define _ZCOMP_H_
|
|
|
|
struct zcomp_strm {
|
|
/* compression/decompression buffer */
|
|
void *buffer;
|
|
/*
|
|
* The private data of the compression stream, only compression
|
|
* stream backend can touch this (e.g. compression algorithm
|
|
* working memory)
|
|
*/
|
|
void *private;
|
|
};
|
|
|
|
/* static compression backend */
|
|
struct zcomp_backend {
|
|
int (*compress)(const unsigned char *src, unsigned char *dst,
|
|
size_t *dst_len, void *private);
|
|
|
|
int (*decompress)(const unsigned char *src, size_t src_len,
|
|
unsigned char *dst);
|
|
|
|
void *(*create)(gfp_t flags);
|
|
void (*destroy)(void *private);
|
|
|
|
const char *name;
|
|
};
|
|
|
|
/* dynamic per-device compression frontend */
|
|
struct zcomp {
|
|
struct zcomp_strm * __percpu *stream;
|
|
struct zcomp_backend *backend;
|
|
struct notifier_block notifier;
|
|
};
|
|
|
|
ssize_t zcomp_available_show(const char *comp, char *buf);
|
|
bool zcomp_available_algorithm(const char *comp);
|
|
|
|
struct zcomp *zcomp_create(const char *comp);
|
|
void zcomp_destroy(struct zcomp *comp);
|
|
|
|
struct zcomp_strm *zcomp_stream_get(struct zcomp *comp);
|
|
void zcomp_stream_put(struct zcomp *comp);
|
|
|
|
int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
|
|
const unsigned char *src, size_t *dst_len);
|
|
|
|
int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
|
|
size_t src_len, unsigned char *dst);
|
|
|
|
bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
|
|
#endif /* _ZCOMP_H_ */
|