[Pacemaker] [Openais] Linux HA on debian sparc

[Steven Dake]

On 05/31/2011 09:44 PM, Angus Salkeld wrote:
> On Tue, May 31, 2011 at 11:52:48PM -0300, william felipe_welter wrote:
>> Angus,
>>
>> I make some test program (based on the code coreipcc.c) and i now i sure
>> that are problems with the mmap systems call on sparc..
>>
>> Source code of my test program:
>>
>> #include <stdlib.h>
>> #include <sys/mman.h>
>> #include <stdio.h>
>>
>> #define PATH_MAX  36
>>
>> int main()
>> {
>>
>> int32_t fd;
>> void *addr_orig;
>> void *addr;
>> char path[PATH_MAX];
>> const char *file = "teste123XXXXXX";
>> size_t bytes=10024;
>>
>> snprintf (path, PATH_MAX, "/dev/shm/%s", file);
>> printf("PATH=%s\n",path);
>>
>> fd = mkstemp (path);
>> printf("fd=%d \n",fd);
>>
>>
>> addr_orig = mmap (NULL, bytes, PROT_NONE,
>>               MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
>>
>>
>> addr = mmap (addr_orig, bytes, PROT_READ | PROT_WRITE,
>>               MAP_FIXED | MAP_SHARED, fd, 0);
>>
>> printf("ADDR_ORIG:%p  ADDR:%p\n",addr_orig,addr);
>>
>>
>>   if (addr != addr_orig) {
>>                printf("Erro");
>>         }
>> }
>>
>> Results on x86:
>> PATH=/dev/shm/teste123XXXXXX
>> fd=3
>> ADDR_ORIG:0x7f867d8e6000  ADDR:0x7f867d8e6000
>>
>> Results on sparc:
>> PATH=/dev/shm/teste123XXXXXX
>> fd=3
>> ADDR_ORIG:0xf7f72000  ADDR:0xffffffff
> 
> Note: 0xffffffff == MAP_FAILED
> 
> (from man mmap)
> RETURN VALUE
>        On success, mmap() returns a pointer to the mapped area.  On
>        error, the value MAP_FAILED (that is, (void *) -1) is returned,
>        and errno is  set appropriately.
> 
>>
>>
>> But im wondering if is really needed to call mmap 2 times ?  What are the
>> reason to call the mmap 2 times, on the second time using the address of the
>> first?
>>
>>
> Well there are 3 calls to mmap()
> 1) one to allocate 2 * what you need (in pages)
> 2) maps the first half of the mem to a real file
> 3) maps the second half of the mem to the same file
> 
> The point is when you write to an address over the end of the
> first half of memory it is taken care of the the third mmap which maps
> the address back to the top of the file for you. This means you
> don't have to worry about ringbuffer wrapping which can be a headache.
> 
> -Angus
> 

interesting this mmap operation doesn't work on sparc linux.

Not sure how I can help here - Next step would be a follow up with the
sparc linux mailing list.  I'll do that and cc you on the message - see
if we get any response.

http://vger.kernel.org/vger-lists.html

>>
>>
>>
>>
>> 2011/5/31 Angus Salkeld <asalkeld at redhat.com>
>>
>>> On Tue, May 31, 2011 at 06:25:56PM -0300, william felipe_welter wrote:
>>>> Thanks Steven,
>>>>
>>>> Now im try to run on the MCP:
>>>> - Uninstall the pacemaker 1.0
>>>> - Compile and install 1.1
>>>>
>>>> But now i have problems to initialize the pacemakerd: Could not
>>> initialize
>>>> Cluster Configuration Database API instance error 2
>>>> Debbuging with gdb i see that the error are on the confdb.. most
>>> specificaly
>>>> the errors start on coreipcc.c  at line:
>>>>
>>>>
>>>> 448        if (addr != addr_orig) {
>>>> 449                goto error_close_unlink;  <- enter here
>>>> 450       }
>>>>
>>>> Some ideia about  what can cause this  ?
>>>>
>>>
>>> I tried porting a ringbuffer (www.libqb.org) to sparc and had the same
>>> failure.
>>> There are 3 mmap() calls and on sparc the third one keeps failing.
>>>
>>> This is a common way of creating a ring buffer, see:
>>> http://en.wikipedia.org/wiki/Circular_buffer#Exemplary_POSIX_Implementation
>>>
>>> I couldn't get it working in the short time I tried. It's probably
>>> worth looking at the clib implementation to see why it's failing
>>> (I didn't get to that).
>>>
>>> -Angus
>>>
>>>
>>> _______________________________________________
>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>
>>> Project Home: http://www.clusterlabs.org
>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>> Bugs:
>>> http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>>>
>>
>>
>>
>> -- 
>> William Felipe Welter
>> ------------------------------
>> Consultor em Tecnologias Livres
>> william.welter at 4linux.com.br
>> www.4linux.com.br
> 
>> _______________________________________________
>> Openais mailing list
>> Openais at lists.linux-foundation.org
>> https://lists.linux-foundation.org/mailman/listinfo/openais
> 
> 
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> 
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker