Re: [patch] arca-vm-6, killed kswapd [Re: [patch] new-vm improvement , [Re: 2.2.0 Bug summary]]

[Zlatko Calusic <Zlatko.Calusic@CARNet.hr>]

Andrea Arcangeli <andrea@e-mind.com> writes:

> On Mon, 4 Jan 1999, Andrea Arcangeli wrote:
> 
> > I am going to do something like that right now...
> 
> Here a new patch (arca-vm-7). It pratically removes kswapd for all places
> except the ATOMIC memory allocation if there aren't process that are just
> freeing memory. 
> 

You have a bug somewhere!

At this point (output of Alt-SysRq-M), machine locked:

Jan  5 03:49:14 atlas kernel: Free pages:         512kB 
Jan  5 03:49:14 atlas kernel:  ( Free: 128 (128 256 384) 
Jan  5 03:49:14 atlas kernel: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 4*128kB = 512kB) 

Probably you have "< instead of <=", or similar logic problem
somewhere.

Bug revealed itself during "mmap-sync" run. It's a program that
utilises bug with shared mappings (you used to send patches for that
one, I don't know if they made it to the tree, so I check
occasionally).

Other than that, VM is really fast, in fact unbelievably fast. Kswapd
is very light on the CPU and interactive feel is great.
-- 
Zlatko
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