Re: [PATCH] VM statistics code

[Marcelo Tosatti <marcelo@conectiva.com.br>]

On Sat, 14 Jul 2001, Andrew Morton wrote:

> Marcelo Tosatti wrote:
> > 
> > Hi Linus,
> > 
> > The following patch adds detailed VM statistics (reported via /proc/stats)
> > which is tunable on/off by the CONFIG_VM_STATS option.
> 
> We need this, bad.  Two suggested changes:
> 
> >
> > +#define VM_STAT_INC_PTEUNMAP(zone) zone->stat.vm_pteunmap++;
> 
> All these macros are a waste of space :)
> 
> Much better to have:
> 
> #define VM_STAT_ZONE(zone, op)	zone->stat.op
> 
> Then, at the call site:
> 
> 	VM_STAT_ZONE(some_zone, vm_pteunmap++);
> 
> Or, if you prefer,
> 
> #define VM_STAT_ZONE_INC(zone, field)	zone->field++
> 
> That way, you don't have to add a new macro each time
> you add a new field.

You're right. Will do that.

> Also, a sysrq key which dumps the stats out, please - when
> your box has wedged there ain't no way you'll be running
> vmstat.

Agreed. 

Thanks for your comments. 

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