Hi Trond,
13 maj 2008 kl. 12.08 skrev Trond Norbye:
Hi,
I noticed your question on the mailing list. Could this be the same
problem I reported in CR 6672627 (code optimizer cause problems for
dtrace -G ). The problem is that you trigger a dtrace probe as the
last instruction in the function, and the compiler is tail-
optimizing the function call... A workaround for the problem is to
add statement below the dtrace probe...
You're quite correct, I tried moving the faulty line one line up and
it solved the issue.
Thx.
Rgrds Mikael
--
Trond Norbye
OPG, Database Technology Group E-mail: [EMAIL PROTECTED]
SUN Microsystems Phone: +47 73842100
Haakon VII's gt. 7B Fax: +47 73842101
7485 Trondheim, Norway
On May 13, 2008, at 10:43 AM, Mikael Ronström wrote:
Hi,
I'm adding DTrace probes to MySQL and MySQL Cluster code and have
some
strange issues when building the dtrace .o file using the dtrace -
G -s command.
A subset of the collections I use are the following:
probe start_acckeyreq(int op_ptr);
probe end_acckeyreq();
probe start_acckeyreq_lockwait(void*, int);
probe end_acckeyreq_lockwait(int op_ptr);
The one that creates a problem is the start_acckeyreq_lockwait
(void*, int);
In the code this looks like the following:
int int_val= operationRecPtr.i;
void *ptr_val= operationRecPtr.p;
jam();
signal->theData[0] = RNIL;
NDB_BLOCKS_START_ACCKEYREQ_LOCKWAIT(ptr_val, int_val);
return;
When executing dtrace -G -s ndb_blocks_dtrace.d DbaccMain.o
the output is (compilation of the cpp file goes fine:
dtrace -G -s ndb_blocks_dtrace.d DbtupExecQuery.o DbtupCommit.o
DbaccMain.o DbdihMain.o DbtcMain.o DblqhMain.o
dtrace: failed to link script ndb_blocks_dtrace: an error was
encountered while processing DbaccMain.o
I haven't figured out any way to get more information. By trial
and error I've discovered that it is this probe that is the
problem, but I don't see any issue with it. I've also had other
issues of similar kind with even simpler functions with only
an int parameter. I don't find any logic why the faulty ones are
faulty and the correct ones are correct, any ideas would be
helpful here.
Rgrds Mikael Ronstrom
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