Re: 5.7-rc0: kswapd eats cpu during a disk test?!

[Vlastimil Babka]

+CC linux-mm

On 5/31/20 12:34 PM, Pavel Machek wrote:
> Hi!
> 
> This is simple cat /dev/sda > /dev/zero... on thinkpad x60 (x86-32),
> with spinning rust.
> 
>   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+  COMMAND
>    1000 root      20   0       0      0      0 R  53.3  0.0  57:34.93  kswapd0
>   27897 root      20   0    6976    580    536 R  44.5  0.0   1:44.53  cat
> 
> It keeps both CPUs busy... and I don't think that's right.

Does an older kernel behave differently here?