Re: Sudden and massive page cache eviction

[Pekka Enberg]

Hi Peter,

2010/11/24 Peter Schüller <scode@xxxxxxxxxxx>:
>>> Do you have any large page (hugetlbfs) or other multi-order (> 1 page)
>>> allocations happening in the kernel?
>
> I forgot to address the second part of this question: How would I best
> inspect whether the kernel is doing that?

You can, for example, record

  cat /proc/meminfo | grep Huge

for large page allocations.

> Looking at the kmalloc() sizes from vmstat -m I have the following on
> one of the machines (so very few larger than 4096). But I suspect you
> are asking for something different?

The "pagesperslab" column of /proc/slabinfo tells you how many pages
slab allocates from the page allocator.

                       Pekka
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