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[Bug runtime/15805] maps should not be allocated with k*alloc
- From: "dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Tue, 13 Aug 2013 16:29:37 +0000
- Subject: [Bug runtime/15805] maps should not be allocated with k*alloc
- Auto-submitted: auto-generated
- References: <bug-15805-6586 at http dot sourceware dot org/bugzilla/>
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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