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-rwxr-xr-xtools/perf/scripts/python/net_dropmonitor.py39
1 files changed, 21 insertions, 18 deletions
diff --git a/tools/perf/scripts/python/net_dropmonitor.py b/tools/perf/scripts/python/net_dropmonitor.py
index a4ffc95..b574059 100755
--- a/tools/perf/scripts/python/net_dropmonitor.py
+++ b/tools/perf/scripts/python/net_dropmonitor.py
@@ -15,35 +15,38 @@ kallsyms = []
def get_kallsyms_table():
global kallsyms
+
try:
f = open("/proc/kallsyms", "r")
- linecount = 0
- for line in f:
- linecount = linecount+1
- f.seek(0)
except:
return
-
- j = 0
for line in f:
loc = int(line.split()[0], 16)
name = line.split()[2]
- j = j +1
- if ((j % 100) == 0):
- print "\r" + str(j) + "/" + str(linecount),
- kallsyms.append({ 'loc': loc, 'name' : name})
-
- print "\r" + str(j) + "/" + str(linecount)
+ kallsyms.append((loc, name))
kallsyms.sort()
- return
def get_sym(sloc):
loc = int(sloc)
- for i in kallsyms:
- if (i['loc'] >= loc):
- return (i['name'], i['loc']-loc)
- 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")
@@ -64,7 +67,7 @@ def trace_end():
# called from perf, when it finds a correspoinding event
def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm,
- skbaddr, protocol, location):
+ skbaddr, location, protocol):
slocation = str(location)
try:
drop_log[slocation] = drop_log[slocation] + 1
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