diff options
| author | Josh Stone <jistone@redhat.com> | 2009-06-02 00:43:49 -0700 |
|---|---|---|
| committer | Josh Stone <jistone@redhat.com> | 2009-06-02 00:43:49 -0700 |
| commit | c8ad068755e7424e767660f2c27cb3b1e2d5343d (patch) | |
| tree | 8d927da0ab13dac41b24560b5e472d2fa9e13e8e /includes | |
| parent | 276465828851648edc5b56f762a0d100051c9e32 (diff) | |
| download | systemtap-steved-c8ad068755e7424e767660f2c27cb3b1e2d5343d.tar.gz systemtap-steved-c8ad068755e7424e767660f2c27cb3b1e2d5343d.tar.xz systemtap-steved-c8ad068755e7424e767660f2c27cb3b1e2d5343d.zip | |
Cache the last result of dwarf_getscopes
This one function accounted for ~30% of my callgrind profile of
"stap -l 'syscall.*'", even though it was only called ~1200 times. We
call dwarf_getscopes for each $target variable, with the same parameters
within a given probe. Since they're no nicely grouped, it's easy to
just cache the most recent call, and the next few calls will be a hit.
Overall this cuts the number of calls down to about 300, for an easy
speed gain.
Diffstat (limited to 'includes')
0 files changed, 0 insertions, 0 deletions