Re: [PATCH] x86/mm: Tracking linear mapping split events since boot

[Tejun Heo]

Hello,

On Mon, Jan 25, 2021 at 12:15:51PM -0800, Dave Hansen wrote:
> > DirectMap4k:     3505112 kB
> > DirectMap2M:    19464192 kB
> > DirectMap1G:    12582912 kB
> > DirectMap2MSplits:  1705
> > DirectMap1GSplits:    20
> 
> This seems much more like something we'd want in /proc/vmstat or as a
> tracepoint than meminfo.  A tracepoint would be especially nice because
> the trace buffer could actually be examined if an admin finds an
> excessive number of these.

Adding a TP sure can be helpful but I'm not sure how that'd make counters
unnecessary given that the accumulated number of events since boot is what
matters.

Thanks.

-- 
tejun