Re: Tools better than vmstat [was: 2.4.9-ac16 good perfomer?]

[Mike Fedyk]

On Fri, Sep 28, 2001 at 11:00:34PM +0100, Russell King wrote:
> On Fri, Sep 28, 2001 at 02:53:24PM -0700, Mike Fedyk wrote:
> > Is there any possibility of using Russell's patch for this user space tool?
> 
> There is one property the kernel space method has over any user space
> tool on a UP machine (and conceivably a SMP machine with more code) -
> you get a complete atomic snapshot of the VM state.  Might be useful
> and important, but might not be.
>

Actually, I was suggesting a combined kernel and user space design.

/proc/vm-page-ages would give all of the gory numbers in an atomic way, and
vm-page-stat would distil that into the percentages much like vmstat
output...

> It would be pretty easy to change my kernel patch to produce what you're
> requesting, from another sysrq key combination.
> 

Is sysrq easier to code for, or initiate-on-proc-read?

I'm just sorry I don't know enough C to do this myself... :(