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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>
This commit is contained in:
Ben Hutchings 2013-05-20 14:45:42 +00:00 committed by David S. Miller
parent 326017c757
commit 0ce58bae85
1 changed files with 18 additions and 4 deletions
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22
tools/perf/scripts/python/net_dropmonitor.py
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@ -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")