From: Jaegeuk Hanse <jaegeuk.hanse@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Luigi Semenzato <semenzato@google.com>,
linux-mm@kvack.org, Dan Magenheimer <dan.magenheimer@oracle.com>
Subject: Re: behavior of zram stats, and zram allocation limit
Date: Sun, 17 Feb 2013 11:25:37 +0800 [thread overview]
Message-ID: <51204DB1.9000203@gmail.com> (raw)
In-Reply-To: <20121123055144.GC13626@bbox>
On 11/23/2012 01:51 PM, Minchan Kim wrote:
> On Wed, Nov 21, 2012 at 02:58:48PM -0800, Luigi Semenzato wrote:
>> 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.
> There is no method to limit the RAM size but I think we can implement
> it easily. The only thing we need is just a "voice of customer".
> Why do you need it?
But in current codes, where implement limit to *uncompressed* swap
device? I can't find it in zram_drv.c, could you point out to me?
>
>> 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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next prev parent reply other threads:[~2013-02-17 3:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-21 22:58 behavior of zram stats, and zram allocation limit Luigi Semenzato
2012-11-22 0:46 ` Luigi Semenzato
2012-11-23 5:51 ` Minchan Kim
2012-11-23 16:45 ` Dan Magenheimer
2012-11-23 17:56 ` Luigi Semenzato
2013-02-17 3:25 ` Jaegeuk Hanse [this message]
2013-02-19 23:54 ` Minchan Kim
2013-02-17 3:01 ` Jaegeuk Hanse
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