Re: OOM fixes 2/5

[Andrew Morton]

Andrea Arcangeli <andrea@xxxxxxx> wrote:
>
> Anyway if you leave it off by default I don't mind, with my new code
>  forward ported stright from 2.4 mainline, it's possible for the first
>  time to set it from userspace without having to embed knowledge on the
>  kernel min_kbytes settings at boot time.

Last time we dicsussed this you pointed out that reserving more lowmem from
highmem-capable allocations may actually *help* things.  (Tries to remember
why) By reducing inode/dentry eviction rates?  I asked Martin Bligh if he
could test that on a big NUMA box but iirc the results were inconclusive.

Maybe it just won't make much difference.  Hard to say.

>  The sysctl name had to change to lowmem_reserve_ratio because its
>  semantics are completely different now.

That reminds me.  Documentation/filesystems/proc.txt ;)

I'll cook something up for that.
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