Re: [RFC] Limit the size of the pagecache

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 1/24/07, Peter Zijlstra <[email protected]> wrote:
On Tue, 2007-01-23 at 16:49 -0800, Christoph Lameter wrote:
> This is a patch using some of Aubrey's work plugging it in what is IMHO
> the right way. Feel free to improve on it. I have gotten repeatedly
> requests to be able to limit the pagecache. With the revised VM statistics
> this is now actually possile. I'd like to know more about possible uses of
> such a feature.
>
>
>
>
> It may be useful to limit the size of the page cache for various reasons
> such as
>
> 1. Insure that anonymous pages that may contain performance
>    critical data is never subject to swap.

This is what we have mlock for, no?

> 2. Insure rapid turnaround of pages in the cache.

This sounds like we either need more fadvise hints and/or understand why
the VM doesn't behave properly.

> 3. Reserve memory for other uses? (Aubrey?)

He wants to make a nommu system act like a mmu system; this will just
never ever work.

Nope. Actually my nommu system works great with some of patches made by us.
What let you think this will never work?

Memory fragmentation is a real issue not some gimmick
thought up by the hardware folks to sell these mmu chips.

I totally disagree. Memory fragmentations is the issue not only on
nommu, it's also on mmu chips. That's not the reason mmu chips can be
sold.

-Aubrey
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux