Re: BUG #2406: Not all systems support SHM_SHARE_MMU

[Paul van der Zwan <Paul(dot)Vanderzwan(at)Sun(dot)COM>]

On 25-apr-2006, at 7:48, Tom Lane wrote:

> "Paul van der Zwan" <paul(dot)vanderzwan(at)sun(dot)com> writes:
> > Only systems with large pagesizes support ISM, so always defining
> > #define PG_SHMAT_FLAGS                  SHM_SHARE_MMU
> > in src/backend/port/sysv_shmem.c  will cause all calls to shmat to  
> > fail with
> > EINVAL on systems that do not support large pages.
>
> That code's been in there since PG 7.3, and no one before you has
> complained.  Are you sure you've identified the problem correctly?
>
> 			regards, tom lane

I am 99% sure that is the cause. If I put shmsys:ism_off=1 in /etc/ 
system
it ignores the SHM_SHARE_MMU flag and it works.
Maybe noone ever ran Postgres on Solaris on a VIA Epia system.
I haven't rebuilt postgres with my suggested patch (yet) so that's  
were the 1% doubt comes in.
I'll try to do that sometime this week.


	Paul