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Date: Fri, 19 Feb 2016 13:46:04 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To: Joonsoo Kim <js1304@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Minchan Kim <minchan@...nel.org>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC PATCH 3/3] mm/zsmalloc: change ZS_MAX_PAGES_PER_ZSPAGE
On (02/19/16 13:16), Sergey Senozhatsky wrote:
> ok, this sets us on a "do we need 32 and 48 bytes classes at all" track?
>
seems that lz4 defines a minimum length to be at least
61 #define COPYLENGTH 8
67 #define MINMATCH 4
70 #define MFLIMIT (COPYLENGTH + MINMATCH)
71 #define MINLENGTH (MFLIMIT + 1)
bytes.
and 32 bytes class still looks unreachable.
# cat /sys/kernel/debug/zsmalloc/zram0/classes
class size huge almost_full almost_empty obj_allocated obj_used pages_used pages_per_zspage
0 32 0 0 0 0 0 1
1 48 26 0 31488 31259 369 3
2 64 1 0 61760 61756 965 1
3 80 2 1 2295 2253 45 1
4 96 4 0 2176 2127 51 3
5 112 1 1 1387 1358 38 2
6 128 0 1 1312 1281 41 1
7 144 1 0 1105 1086 39 3
8 160 2 2 1173 1137 46 2
9 176 4 0 1023 995 44 4
10 192 6 1 960 913 45 3
11 208 1 1 897 883 46 2
12 224 1 2 803 735 44 4
13 240 2 1 799 785 47 1
14 256 1 1 816 807 51 1
15 272 1 1 765 758 51 1
16 288 3 1 840 831 60 1
17 304 2 1 960 940 72 3
18 320 1 1 1020 999 80 4
19 336 2 0 1104 1102 92 1
20 352 4 1 1265 1247 110 2
21 368 1 1 1287 1280 117 1
22 384 2 0 1248 1242 117 3
23 400 0 0 1380 1380 138 1
24 416 1 0 1404 1403 144 4
25 432 0 0 1400 1400 150 3
26 448 1 0 1278 1277 142 1
27 464 0 2 1295 1263 148 4
28 480 4 0 1326 1319 156 2
29 496 2 2 2343 2311 284 4
30 512 0 0 1360 1360 170 1
31 528 0 3 1395 1365 180 4
32 544 2 1 1320 1306 176 2
33 560 0 1 1218 1203 168 4
34 576 0 0 1162 1162 166 1
35 592 2 1 1053 1033 156 4
36 608 2 2 1440 1424 216 3
37 624 0 1 1664 1659 256 2
38 640 1 1 1197 1186 189 3
40 672 0 2 2292 2287 382 1
42 704 3 0 2369 2365 412 4
43 720 1 1 1207 1198 213 3
44 736 1 1 1232 1227 224 2
46 768 1 2 2336 2323 438 3
49 816 0 0 3615 3615 723 1
51 848 3 1 2185 2174 460 4
52 864 1 1 1148 1141 246 3
54 896 2 2 2889 2881 642 2
57 944 2 0 3796 3794 876 3
58 960 2 0 1428 1423 336 4
62 1024 0 1 5604 5603 1401 1
66 1088 0 1 6060 6047 1616 4
67 1104 1 0 1661 1659 453 3
71 1168 2 0 6440 6438 1840 2
74 1216 4 0 5120 5115 1536 3
76 1248 4 0 3536 3531 1088 4
83 1360 0 1 15282 15281 5094 1
91 1488 3 1 17897 17887 6508 4
94 1536 3 1 5768 5762 2163 3
100 1632 3 1 10275 10270 4110 2
107 1744 1 1 11676 11673 5004 3
111 1808 3 0 6714 6711 2984 4
126 2048 0 2 27758 27756 13879 1
144 2336 0 5 32823 32807 18756 4
151 2448 3 2 9650 9642 5790 3
168 2720 0 8 13341 13326 8894 2
190 3072 0 3 7804 7799 5853 3
202 3264 2 0 255 253 204 4
254 4096 Y 0 0 636960 636960 636960 1
-ss
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