Re: howto see shmem

[Mike Fedyk]

On Wed, Oct 24, 2001 at 07:37:26PM -0400, Robert Love wrote:
> On Wed, 2001-10-24 at 19:27, Mart?n Marqu?s wrote:
> > [...]
> > ------ Shared Memory Segments --------
> > key       shmid     owner     perms     bytes     nattch    status
> > 0x00000000 65536     nobody    600       46084     11        dest
> > [...]
> > I can see 46084 bytes in shared memory used by the apache.
> > Am I wrong?
> 
> Nope.  Applications know how much the are sharing because they can
> easily see what region of memory is shared/mapped into their's.
> 
> The reason the kernel can't figure out the net shared memory is because
> there is no simple way -- it has to add up the shared regions of all
> applications, counting each shared segment only once.  Too much work.
> 

Actually, if it's done in the COW code, you could quite possibly get most of
it right there...

Does anyone know of something that can make use of the shmem accting?