On 4 Nov 2000, Christoph Rohland wrote:
> Rik van Riel <riel@conectiva.com.br> writes:
> > Indeed, shared memory performance still sucks rocks.
>
> No, it's not a performance problem. It is a hard lockup problem on
> highmem machines.
>
> I do see two problems here:
> 1) shm_swap_core does not handle the failure of prepare_higmem_swapout
> right and basically cannot do so. It gets called zone independant
> and should probably get called per zone. At least it has to react:
AFAIC try_to_swap_out can handle this situation fine, it
shouldn't be very difficult to get shm_swap to handle it
too...
Unfortunately I don't have a really big memory machine so
I cannot test this stuff :(
> You see: you only have 5+27+27=59 pages under your control...
Ughhhh. Maybe we need some rebalancing there as well.
That's a maximum of 5 pages of executable text mapped
into all processes...
regards,
Rik
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