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Joseph Schuchart
0f5f5bcd11
This provides valuable information for tracing performance problems. Since this change alters the interface for the python scripts, also adjust the script generation and the provided scripts. Signed-off-by: Joseph Schuchart <[email protected]> Acked-by: Thomas Ilsche <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Ilsche <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
76 lines
1.7 KiB
Python
Executable File
76 lines
1.7 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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except:
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return
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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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kallsyms.append((loc, name))
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kallsyms.sort()
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def get_sym(sloc):
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loc = int(sloc)
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# Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start
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# kallsyms[i][0] > loc for all end <= i < len(kallsyms)
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start, end = -1, len(kallsyms)
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while end != start + 1:
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pivot = (start + end) // 2
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if loc < kallsyms[pivot][0]:
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end = pivot
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else:
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start = pivot
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# Now (start == -1 or kallsyms[start][0] <= loc)
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# and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0])
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if start >= 0:
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symloc, name = kallsyms[start]
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return (name, loc - symloc)
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else:
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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, callchain,
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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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