Re: S390x - REL5 stap_testing_200611132049.results]

[David Smith <dsmith@redhat.com>]

David Wilder wrote:
> David Smith wrote:
> 
>>
>> Something *really* strange is going on there.  The above output (and 
>> the part that I cut out) shows that stap didn't do pass 4 for any of 
>> the cache tests.  That's really odd, since "stap -p4" is hardcoded in 
>> that test.
>>
>> Can you run the following command *twice* and send me the output?
>>
>> # stap -v -p4 -e "probe begin {}"
>>
>> The output should look something like:
>>
>> ---------------
>> # stap -v -p4 -e "probe begin {}"
>> Pass 1: parsed user script and 53 library script(s) in 
>> 140usr/10sys/165real ms.
>> Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 embed(s), 0 
>> global(s) in 10usr/10sys/3real ms.
>> Pass 3: translated to C into 
>> "/tmp/stapGSMvEZ/stap_7a5fe045c67645c83d0df1d327d2de1c_122.c" in 
>> 0usr/0sys/0real ms.
>> Pass 4: compiled C into "stap_7a5fe045c67645c83d0df1d327d2de1c_122.ko" 
>> in 880usr/140sys/2566real ms.
>> # stap -v -p4 -e "probe begin {}"
>> Pass 1: parsed user script and 53 library script(s) in 
>> 140usr/20sys/490real ms.
>> Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 embed(s), 0 
>> global(s) in 10usr/0sys/3real ms.
>> Pass 3: using cached 
>> /home/dsmith/.systemtap/cache/7a/stap_7a5fe045c67645c83d0df1d327d2de1c_122.c 
>>
>> Pass 4: using cached 
>> /home/dsmith/.systemtap/cache/7a/stap_7a5fe045c67645c83d0df1d327d2de1c_122.ko 
>>
>> ---------------
>>
> Pass 4 is giving an error,  odd that it did not show up in the test 
> log.  Here it is:
> [....]
> mp/stapuYgXg9/.tmp_stap_9001.o /tmp/stapuYgXg9/stap_9001.c
> In file included from /usr/local/share/systemtap/runtime/runtime.h:79,
>                 from /tmp/stapuYgXg9/stap_9001.c:31:
> /usr/local/share/systemtap/runtime/alloc.c:66: error: expected 
> declaration specifiers or '...' before '(' token
> /usr/local/share/systemtap/runtime/alloc.c: In function 'percpu_free':
> /usr/local/share/systemtap/runtime/alloc.c:67: error: number of 
> arguments doesn't match prototype
> include/linux/percpu.h:51: error: prototype declaration
> [...]
> 
>  From runtime/alloc.c
> [...]
> #ifdef CONFIG_SMP
> [...]
> 66: void _stp_free_percpu(const void *objp)
> {
>        int i;
>        struct percpu_data *p = (struct percpu_data *) (~(unsigned long) 
> objp);
> 
>        for_each_cpu(i)
>                kfree(p->ptrs[i]);
>        kfree(p);
> }
> 
> But earler in alloc.c _stp_free_percpu() is defined:
> 
> #ifdef CONFIG_SMP
> #define _stp_free_percpu(ptr) free_percpu(ptr)
> #else
> #define _stp_free_percpu(ptr) kfree(ptr)
> #endif
> 
> I think the #ifdefs are messed up.  Both defines are under  CONFIG_SMP.
> If I comment out the first defines it works better, but I am still net 
> seeing the
> "using cached " message.
> 
> root@hez235 testing]# stap -v -p4 -e "probe begin {}"
> Pass 1: parsed user script and 52 library script(s) in 
> 1410usr/90sys/1617real ms.
> Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 global(s) in 
> 20usr/0sys/25real ms.
> Pass 3: translated to C into "/tmp/stapAeJiJi/stap_9300.c" in 
> 780usr/2750sys/3863real ms.
> Pass 4: compiled C into "stap_9300.ko" in 9440usr/1950sys/12946real ms.
> [root@hez235 testing]# stap -v -p4 -e "probe begin {}"
> Pass 1: parsed user script and 52 library script(s) in 
> 1410usr/90sys/1615real ms.
> Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 global(s) in 
> 20usr/0sys/27real ms.
> Pass 3: translated to C into "/tmp/stapsDZD66/stap_9388.c" in 
> 770usr/2760sys/4103real ms.
> Pass 4: compiled C into "stap_9388.ko" in 9470usr/1960sys/12527real ms.
> 

Hmm.  It appears from that output that the 'stap' binary you are using 
doesn't have caching support.  If it did, the name of the C file 
wouldn't be 'stap_9388.c', it would be something like 
'stap_6bc3d92354bbb164201d174128e2eca5_122.c'.

Can you check and ensure that the latest systemtap has been compiled and 
installed?  Let's see the output of "stap -V".

-- 
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
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