[Bug runtime/15805] maps should not be allocated with k*alloc

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15805

--- Comment #4 from David Smith <dsmith at redhat dot com> ---
Here's some additional information. After some more debugging, I've found out
the systemtap.maps/ix_clear.stp testcase ends up making one call to
_stp_pmap_new() with the following parameters: max_entries: 2048, wrap: 0,
node_size 72. This ends up with 67618 calls to  _stp_map_vzalloc().

That's right, over 67000 calls to _stp_map_vzalloc() from 1 call to
_stp_pmap_new().

Looks like if we switch to vmalloc, we need to figure out how to allocate in
bigger chunks.

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