Re: 2.6.1: kernel BUG at mm/swapfile.c:806

[marcel cotta]

marcel cotta wrote:
> Andrew Morton wrote:
>
> > marcel cotta <marcel@xxxxxxxxxxxxx> wrote:
> >
> > > Andrew Morton wrote:
> > >
> > > > marcel cotta <marcel@xxxxxxxxxxxxx> wrote:
> > > >
> > > >
> > > > > i got this oops after the box swapped like crazy under X for about 
> > > > > 5 minutes
> > > > > while swapping it was nearly unusable (jerky mouse, console 
> > > > > switching took 10 seconds)
> > > > > the extreme performance drop is always reproducible when swapping 
> > > > > starts
> > > > >
> > > > >
> > > > > ------------[ cut here ]------------
> > > > > kernel BUG at mm/swapfile.c:806!
> > > >
> > > >
> > > >
> > > > Amazing.  Are you using a swapfile, or are you swapping to a block 
> > > > device?
> > >
> > > hehe, hasnt been reported for a while eh ;)
> > >
> > > i used swapfiles, one static 50mb file and the rest in temp 16MB 
> > > blocks managed by swapd
> >
> >
> >
> > What is `swapd'?
>
>
> the box is still running and i just saw another thing
>
> hades:~# cat /proc/swaps
> Filename                                Type            Size    Used
>   Priority
> /swap/linux0.swp                         file           14184   14160   -1
> /swap/linux1.swp                         file           16184   16036
>   -22
> /swap/linux2.swp                         file           16184   15740
>   -23
> /swap/linux3.swp                         file           16184   15720
>   -28
> /swap/linux4.swp                         file           16184   15960
>   -43
> /swap/linux5.swp                         file           16184   13380
>   -44
> /swap/linux6.swp                         file           16184   104
>   -45
> /swap/linux7.swp                         file           16184   0
>   -46
> /swap/linux8.swp                         file           16184   4
>   -47
>
>
> hades:~# free
>              total       used       free     shared    buffers     cached
> Mem:        188724     184076       4648          0        328      33176
> -/+ buffers/cache:     150572      38152
> Swap:       127476      90528      36948
>
>
> have a look at the total swap amount, free reports 127476 but the
> total should be 143656
> the /swap/linux0.swp file being 2mb smaller is no error
> it is caused by setting swapfile size in /etc/swapd.conf to 14184,
> while only
> this file being in use, and restarting swapd with 16184 as new
> swapfile size

another thing as im still playing with this

the swapfiles size is 143656 kb
/proc/swap reports 127476 kb

thats makes a difference of 16180 kb, so 4 kb must be missing since a 
swapfile is 16184
these are exactly the 4 bytes in the /swap/linux8.swp
i just tried to less it - the process went right into D state :p

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