Re: [PATCH][2.6] No swapping on memory backed swapfiles

[davidsen@tmr.com (bill davidsen)]

In article <200310130832.h9D8WJ4g000157@81-2-122-30.bradfords.org.uk>,
John Bradford  <john@grabjohn.com> wrote:
| Quote from Andrew Morton <akpm@osdl.org>:
| > Zwane Mwaikambo <zwane@arm.linux.org.uk> wrote:
| > >
| > > +	bdi = mapping->backing_dev_info;
| > >  +	if (bdi->memory_backed)
| > >  +		goto bad_swap;
| > >  +
| > 
| > I guess that makes sense, although someone might want to swap onto a
| > ramdisk-backed file just for some testing purpose.
| 
| Or because some RAM is slower than the rest.  This came up a while ago
| on the list.

Something on my "learn how to..." list, I have some systems which are
setup to cache only the first 64MB, and I bet they would run a lot
faster if the rest were used as swap. It is definitely faster with
mem=64 than letting the CPU beat the whole memory.
-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.