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The comparison between traced and symbol addresses is backwards: if the traced address doesn't exactly match a symbol (which we don't expect it to), we'll show the next symbol and the offset to it, whereas we should show the previous symbol and the offset from it. Cc: stable@vger.kernel.org Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
73 lines
1.5 KiB
Python
Executable File
73 lines
1.5 KiB
Python
Executable File
# Monitor the system for dropped packets and proudce a report of drop locations and counts
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import os
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import sys
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sys.path.append(os.environ['PERF_EXEC_PATH'] + \
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'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
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from perf_trace_context import *
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from Core import *
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from Util import *
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drop_log = {}
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kallsyms = []
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def get_kallsyms_table():
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global kallsyms
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try:
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f = open("/proc/kallsyms", "r")
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linecount = 0
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for line in f:
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linecount = linecount+1
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f.seek(0)
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except:
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return
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j = 0
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for line in f:
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loc = int(line.split()[0], 16)
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name = line.split()[2]
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j = j +1
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if ((j % 100) == 0):
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print "\r" + str(j) + "/" + str(linecount),
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kallsyms.append({ 'loc': loc, 'name' : name})
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print "\r" + str(j) + "/" + str(linecount)
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kallsyms.sort()
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return
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def get_sym(sloc):
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loc = int(sloc)
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for i in kallsyms[::-1]:
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if loc >= i['loc']:
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return (i['name'], loc - i['loc'])
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return (None, 0)
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def print_drop_table():
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print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")
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for i in drop_log.keys():
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(sym, off) = get_sym(i)
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if sym == None:
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sym = i
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print "%25s %25s %25s" % (sym, off, drop_log[i])
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def trace_begin():
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print "Starting trace (Ctrl-C to dump results)"
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def trace_end():
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print "Gathering kallsyms data"
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get_kallsyms_table()
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print_drop_table()
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# called from perf, when it finds a correspoinding event
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def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm,
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skbaddr, location, protocol):
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slocation = str(location)
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try:
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drop_log[slocation] = drop_log[slocation] + 1
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except:
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drop_log[slocation] = 1
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