On Sun, 12 Aug 2018 03:51:40 +0000, Vincent Pelletier
<plr.vinc...@gmail.com> wrote:
>   This said, I was surprised by "free" output listing only a bit
>   above 3GB of ram total:
>   $ free -m
>                 total        used        free      shared  buff/cache   
> available
>   Mem:           3310         250        2867           5         192        
> 2847
>   Swap:          5015           0        5015
>   Would it be an effect of KASAN ?
>   I also found the following line in dmesg:
>   [    0.000000] Memory: 3099784K/4088348K available (14348K kernel code, 
> 4532K rwdata, 5400K rodata, 1840K init, 9112K bss, 988564K reserved, 0K 
> cma-reserved)
>   Checking pre-KASAN boots it was:
>   [    0.000000] Memory: 3657884K/4088348K available (10252K kernel code, 
> 1210K rwdata, 3216K rodata, 1548K init, 656K bss, 430464K reserved, 0K 
> cma-reserved)

Answering my own question after a bit of RTFM: KASAN uses 1 byte to
track 8 bytes, so monitoring 4GB takes 512MB, so it indeed explains the
vast majority of the difference in reserved memory.
-- 
Vincent Pelletier

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