Attachment 206046 Details for Bug 239351 – kgdb script

kgdb script

acttrace.py (text/plain), 1.36 KB, created by Mark Johnston on 2019-07-25 01:08:05 UTC

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Creator: Mark Johnston

Created: 2019-07-25 01:08:05 UTC

Size: 1.36 KB

patch

obsolete

>import gdb
>import math
>
>def cpu_foreach():
>    all_cpus = gdb.lookup_global_symbol("all_cpus").value()
>    bitsz = gdb.lookup_type("long").sizeof * 8
>    maxid = gdb.lookup_global_symbol("mp_maxid").value()
>
>    cpu = 0
>    while cpu <= maxid:
>        upper = cpu >> int(math.log(bitsz, 2))
>        lower = 1 << (cpu & (bitsz - 1))
>        if (all_cpus['__bits'][upper] & lower) != 0:
>            yield cpu
>        cpu = cpu + 1
>
>class acttrace(gdb.Command):
>    def __init__(self):
>        super(acttrace, self).__init__("acttrace", gdb.COMMAND_USER)
>
>    def _thread_by_tid(self, tid):
>        threads = gdb.inferiors()[0].threads()
>        for td in threads:
>            if td.ptid[2] == tid:
>                return td
>
>    def invoke(self, arg, from_tty):
>        # Save the currently selected thread.
>        curthread = gdb.selected_thread()
>
>        # This works on most, but not all platforms.
>        pcpu = gdb.lookup_global_symbol("__pcpu").value()
>        for cpu in cpu_foreach():
>            td = pcpu[cpu]['pc_curthread']
>            p = td['td_proc']
>            self._thread_by_tid(td['td_tid']).switch()
>
>            print("Tracing command {} pid {} tid {} (CPU {})".format(
>                p['p_comm'].string(), p['p_pid'], td['td_tid'], cpu))
>            gdb.execute("bt")
>            print
>
>        # Switch back to the starting thread.
>        curthread.switch()
>
>acttrace()

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