Re: [REGRESSION] [BISECTED] kswapd high CPU usage

["Kirill A. Shutemov" <kirill@shutemov.name>]

On Mon, Jan 25, 2016 at 04:46:58PM +0000, Hugh Greenberg wrote:
> Kirill A. Shutemov <kirill <at> shutemov.name> writes:
> 
> > 
> > On Sat, Jan 23, 2016 at 03:57:21PM +0000, Hugh Greenberg wrote:
> > > Kirill A. Shutemov <kirill <at> shutemov.name> writes:
> > > > 
> > > > Could you try to insert 
> "late_initcall(set_recommended_min_free_kbytes);"
> > > > back and check if makes any difference.
> > > > 
> > > 
> > > We tested adding late_initcall(set_recommended_min_free_kbytes); 
> > > back in 4.1.14 and it made a huge difference. We aren't sure if the
> > > issue is 100% fixed, but it could be. We will keep testing it.
> > 
> > It would be nice to have values of min_free_kbytes before and after
> > set_recommended_min_free_kbytes() in your configuration.
> > 
> 
> Before adding set_recommended_min_free_kbytes: 5391
> After: 67584

[ add more people to the thread ]

The 'before' value look low to me for machine with 2G of RAM.

In the bugzilla[1], you've mentioned zram. I wounder if we need to
increase min_free_kbytes when zram is in use as we do for THP.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=110501

-- 
 Kirill A. Shutemov

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