Hi,
I'm trying to adapt the hotuser script
(http://www.brendangregg.com/DTrace/hotuser) so that I can give it some
context information.
As the first cut I have the following script which only prints profiling
information while inside a routine matching a pid:::entry probe and
taking more than so many microseconds to complete.
It seems to be working after a fashion, except that it seems to buffer
output from several activations of 'output routine' and print them all
at once, and then stop.
Also, the count always seems to be zero, for example here is some output:
CTX: _ZN4Foo3Blah10BlahManager16HandleTimerEv elapsed=4214519
PRO: 0x0 0
PRO: node-01.15.01`0x9984b0 0
PRO: node-01.15.01`0xef4e4c 0
PRO: node-01.15.01`0xef5e21 0
PRO: node-01.15.01`0xf00aab 0
PRO: 0xfffffd7ff7950208 0
PRO: libc.so.1`memmove+0x14 0
PRO: libc.so.1`realfree+0xa9 0
PRO: libc.so.1`pselect+0xd0 0
PRO: libc.so.1`_fcntl 0
PRO: libc.so.1`mutex_unlock+0xc 0
PRO: libc.so.1`gettimeofday+0x8 0
PRO: libm.so.2`log2_x+0xb3 0
END:
The process is a single threaded event loop using select and handling a
lot of sockets.
I'm wondering if I'm on the right track here and if anyone can offer any
advice. It would be great to have this working!
Cheers,
Jono Poff
......... Here is the script:
=====================================================
string context;
uint64_t ts;
BEGIN
{
context = "";
ts = 0;
}
pid$target::*HandleInput*:entry,
pid$target::*HandleOutput*:entry,
pid$target::*HandleTimer*:entry
/context == ""/
{
context = probefunc;
ts = timestamp;
}
profile:::profile-997hz
/pid == $target && ts > 0/
{
@pc[arg1] = count();
}
/* =============== output routine =========== */
pid$target::*HandleInput*:return,
pid$target::*HandleOutput*:return,
pid$target::*HandleTimer*:return
/context == probefunc && timestamp - ts > 10000/
{
printf("CTX: %s elapsed=%d\n", context, timestamp - ts);
printa("PRO: %A %@d\n", @pc);
printf("END:\n");
}
/* ======================================== */
pid$target::*HandleInput*:return,
pid$target::*HandleOutput*:return,
pid$target::*HandleTimer*:return
/context == probefunc/
{
context = "";
ts = 0;
clear(@pc);
}
====================================================
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