diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2013-05-20 14:45:42 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-22 15:10:10 -0700 |
| commit | 0ce58bae851dc3728af1c0b83905cd6b4565417a (patch) | |
| tree | 3fd036c3c7219f200cd45d859ae97e4e7989cce1 | |
| parent | 326017c757e387007c6629797d7ae22fd33c1317 (diff) | |
perf: net_dropmonitor: Use bisection in symbol lookup
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rwxr-xr-x | tools/perf/scripts/python/net_dropmonitor.py | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/tools/perf/scripts/python/net_dropmonitor.py b/tools/perf/scripts/python/net_dropmonitor.py index 6acdc82ef47f..32fcee05c0f6 100755 --- a/tools/perf/scripts/python/net_dropmonitor.py +++ b/tools/perf/scripts/python/net_dropmonitor.py @@ -40,10 +40,24 @@ def get_kallsyms_table(): def get_sym(sloc): loc = int(sloc) - for symloc, name in kallsyms[::-1]: - if loc >= symloc: - return (name, loc - symloc) - return (None, 0) + + # Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start + # kallsyms[i][0] > loc for all end <= i < len(kallsyms) + start, end = -1, len(kallsyms) + while end != start + 1: + pivot = (start + end) // 2 + if loc < kallsyms[pivot][0]: + end = pivot + else: + start = pivot + + # Now (start == -1 or kallsyms[start][0] <= loc) + # and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0]) + if start >= 0: + symloc, name = kallsyms[start] + return (name, loc - symloc) + else: + return (None, 0) def print_drop_table(): print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT") |