Hi,
Two questions for zram developers/users. (Please let me know if it is
NOT acceptable to use this list for these questions.)
1. When I run a synthetic load using zram from kernel 3.4.0,
compr_data_size from /sys/block/zram0 seems to decrease even though
orig_data_size stays constant (see below). Is this a bug that was
fixed in a later release? (The synthetic load is a bunch of processes
that allocate memory, fill half of it with data from /dev/urandom, and
touch the memory randomly.) I looked at the code and it looks right.
:-P
2. Is there a way of setting the max amount of RAM that zram is
allowed to allocate? Right now I can set the size of the
*uncompressed* swap device, but how much memory gets allocated depends
on the compression ratio, which could vary.
Thanks!
localhost ~ # ./zraminfo
compr_data_size: 220570516 (210 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 230383616 (219 MB)
notify_free: 1553 (0 MB)
num_reads: 6093 (0 MB)
num_writes: 150955 (0 MB)
orig_data_size: 599126016 (571 MB)
size: 6057544 (5 MB)
zero_pages: 4040 (0 MB)
eff. compr. ratio: 2.50
localhost ~ #
localhost ~ # ./zraminfo
compr_data_size: 208845619 (199 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 213528576 (203 MB)
notify_free: 76808 (0 MB)
num_reads: 81918 (0 MB)
num_writes: 202924 (0 MB)
orig_data_size: 586076160 (558 MB)
size: 6057544 (5 MB)
zero_pages: 7434 (0 MB)
eff. compr. ratio: 2.80
localhost ~ # ./zraminfo
compr_data_size: 205964814 (196 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 210976768 (201 MB)
notify_free: 91823 (0 MB)
num_reads: 105170 (0 MB)
num_writes: 218485 (0 MB)
orig_data_size: 614526976 (586 MB)
size: 6057544 (5 MB)
zero_pages: 8666 (0 MB)
eff. compr. ratio: 2.98
localhost ~ # ./zraminfo
compr_data_size: 229739564 (219 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 235798528 (224 MB)
notify_free: 108381 (0 MB)
num_reads: 147372 (0 MB)
num_writes: 251829 (0 MB)
orig_data_size: 697163776 (664 MB)
size: 6057544 (5 MB)
zero_pages: 9972 (0 MB)
eff. compr. ratio: 3.01
localhost ~ # ./zraminfo
compr_data_size: 229458612 (218 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 234651648 (223 MB)
notify_free: 132169 (0 MB)
num_reads: 203970 (0 MB)
num_writes: 282732 (0 MB)
orig_data_size: 751472640 (716 MB)
size: 6057544 (5 MB)
zero_pages: 11139 (0 MB)
eff. compr. ratio: 3.27
localhost ~ # ./zraminfo
compr_data_size: 217296398 (207 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 222715904 (212 MB)
notify_free: 151071 (0 MB)
num_reads: 243898 (0 MB)
num_writes: 302316 (0 MB)
orig_data_size: 778227712 (742 MB)
size: 6057544 (5 MB)
zero_pages: 10195 (0 MB)
eff. compr. ratio: 3.58
localhost ~ # ./zraminfo
compr_data_size: 221631885 (211 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 227188736 (216 MB)
notify_free: 166323 (0 MB)
num_reads: 278621 (0 MB)
num_writes: 323811 (0 MB)
orig_data_size: 821809152 (783 MB)
size: 6057544 (5 MB)
zero_pages: 10737 (0 MB)
eff. compr. ratio: 3.70
localhost ~ # ./zraminfo
compr_data_size: 216354938 (206 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 221990912 (211 MB)
notify_free: 182529 (0 MB)
num_reads: 322923 (0 MB)
num_writes: 342028 (0 MB)
orig_data_size: 849281024 (809 MB)
size: 6057544 (5 MB)
zero_pages: 10990 (0 MB)
eff. compr. ratio: 3.92
localhost ~ # ./zraminfo
compr_data_size: 163852068 (156 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 170209280 (162 MB)
notify_free: 212669 (0 MB)
num_reads: 358680 (0 MB)
num_writes: 342896 (0 MB)
orig_data_size: 777981952 (741 MB)
size: 6057544 (5 MB)
zero_pages: 7466 (0 MB)
eff. compr. ratio: 4.77
localhost ~ # ./zraminfo
compr_data_size: 164434814 (156 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 170631168 (162 MB)
notify_free: 218105 (0 MB)
num_reads: 368430 (0 MB)
num_writes: 349043 (0 MB)
orig_data_size: 785846272 (749 MB)
size: 6057544 (5 MB)
zero_pages: 7996 (0 MB)
eff. compr. ratio: 4.78
localhost ~ # ./zraminfo
compr_data_size: 129945717 (123 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 136237056 (129 MB)
notify_free: 241461 (0 MB)
num_reads: 404654 (0 MB)
num_writes: 360153 (0 MB)
orig_data_size: 763969536 (728 MB)
size: 6057544 (5 MB)
zero_pages: 7911 (0 MB)
eff. compr. ratio: 5.88
localhost ~ # ./zraminfo
compr_data_size: 134384535 (128 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 140816384 (134 MB)
notify_free: 242365 (0 MB)
num_reads: 406159 (0 MB)
num_writes: 362829 (0 MB)
orig_data_size: 773607424 (737 MB)
size: 6057544 (5 MB)
zero_pages: 7975 (0 MB)
eff. compr. ratio: 5.69
localhost ~ # ./zraminfo
compr_data_size: 133314196 (127 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 139538432 (133 MB)
notify_free: 252447 (0 MB)
num_reads: 411617 (0 MB)
num_writes: 365459 (0 MB)
orig_data_size: 754352128 (719 MB)
size: 6057544 (5 MB)
zero_pages: 7954 (0 MB)
eff. compr. ratio: 5.68
localhost ~ # ./zraminfo
compr_data_size: 124826153 (119 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 131440640 (125 MB)
notify_free: 263839 (0 MB)
num_reads: 427837 (0 MB)
num_writes: 375085 (0 MB)
orig_data_size: 762548224 (727 MB)
size: 6057544 (5 MB)
zero_pages: 7504 (0 MB)
eff. compr. ratio: 6.08
localhost ~ # ./zraminfo
compr_data_size: 94379398 (90 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 105000960 (100 MB)
notify_free: 291596 (0 MB)
num_reads: 465420 (0 MB)
num_writes: 386267 (0 MB)
orig_data_size: 721780736 (688 MB)
size: 6057544 (5 MB)
zero_pages: 7482 (0 MB)
eff. compr. ratio: 7.31
localhost ~ # ./zraminfo
compr_data_size: 67124988 (64 MB)
disksize: 3101462528 (2957 MB)
mem_used_total: 73981952 (70 MB)
notify_free: 336548 (0 MB)
num_reads: 499935 (0 MB)
num_writes: 400298 (0 MB)
orig_data_size: 700309504 (667 MB)
size: 6057544 (5 MB)
zero_pages: 7495 (0 MB)
eff. compr. ratio: 10.41
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