thanks all , when i see dtrace can not use if , i think a solution to my script
it's a time counter dtrace script for all java methods...because dtrace is not
start with the jvm at the same time ,so many java method will not have a
entry, so at return probe is hard to count time cost...
after test , a method throw a Exception will also have a return probe, so this
script will work now...
#!/usr/sbin/dtrace -s
#pragma D option quiet
dtrace:::BEGIN
{
self->index = 0;
tstart = timestamp;
}
hotspot$1:::method-entry
{
mname = strjoin(strjoin(copyinstr(arg1,arg2),"->"),copyinstr(arg3,arg4));
self->index++;
self->mname[self->index] = mname;
self->mtime[self->index] = timestamp;
@count[mname] = count();
}
hotspot$1:::method-return
{
mname = strjoin(strjoin(copyinstr(arg1,arg2),"->"),copyinstr(arg3,arg4));
mindex = (self->mname[self->index] == mname) ? -1 : 0;
mtime = (mindex == -1) ? self->mtime[self->index] : tstart;
/*
mname = (mindex == -1) ? mname : strjoin("non-start-", mname);
printf("method : %s : start : %d\n", mname, tstart);
*/
@time[mname] = avg(timestamp - mtime);
self->index += mindex;
}
copyinstr sometimes will get a wrong string if havn't the length param...like
this:
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
0: 6e 6f 6e 2d 73 74 61 72 74 2d 6a 61 76 61 2f 69 non-start-java/i
10: 6f 2f 42 75 66 66 65 72 65 64 57 72 69 74 65 72 o/BufferedWriter
20: 01 c0 d7 42 30 02 e0 d8 13 2d 3e 6e 65 77 4c 69 ...B0....->newLi
30: 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ne..............
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
--
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