Re: PF_MEMALLOC in 2.6

Oliver Neukum
2004-08-20T07:55:37Z

Am Freitag, 20. August 2004 04:37 schrieb Nick Piggin:
> So if this thing allocates memory on behalf of a read request, then
> it is basically a bug. In practice you could probably get away with
> servicing all writes with PF_MEMALLOC, however that could still lead
> to situations where it consumes all your low memory on behalf of
> highmem IO (though perhaps this won't deadlock if that memory is
> going to be released as a matter of course?)
>
> Another thing, having it always use PF_MEMALLOC means it can easily
> wipe out the GFP_ATOMIC reserve.
>
> So I'd say try to find a way to only use PF_MEMALLOC on behalf of
> a PF_MEMALLOC thread or use a mempool or something.

Then the SCSI layer should pass down the flag.

Regards
Oliver