Re: trouble getting memory and swap info

[Sten Spans <sten@xxxxxxxxxxxxxxxx>]

On Thu, 28 Oct 2004, Joerg Sonnenberger wrote:

> On Thu, Oct 28, 2004 at 02:17:03AM +0200, Sten Spans wrote:
> > On fbsd4 and probably dragonfly a program needs
> > setgid kmem for certain memory statistics, which is
> > why top works and gkrellm doesn't.
>
> If you have details to which statistics are only available via kmem
> and not by sysctl, tell me. We can easily add sysctl handlers for them
> and remove the setgid kmem requirement from top and other such tools.
> I don't like the idea of userland reading kernel memory directly at all.

The main bugbear is kvm_getswapinfo aka :

kvm_getswapinfo(kd, swapary, 1, 0);
data->swap_stats[0] = pagetob(swapary[0].ksw_total);
data->swap_stats[1] = pagetob(swapary[0].ksw_used);
data->swap_stats[2] = pagetob(swapary[0].ksw_total - swapary[0].ksw_used);


( this comes from my trivial tcp system statistics program,
  http://viewcvs.blinkenlights.nl/index.cgi/monitor/ )

--
Sten Spans

"There is a crack in everything, that's how the light gets in."
Leonard Cohen - Anthem