Re: changing mm->mmap_sem (was: Re: system call for process information?)

[Rik van Riel <riel@conectiva.com.br>]

On Sun, 18 Mar 2001, Mike Galbraith wrote:

> I gave this patch a try, and the initial results are extremely encouraging.
> Not only do I have vmstat (SCHED_RR) info in realtime with zero delays :))
> I also have a _nice_ throughput improvement.  There are some worrisome
> warnings below along with the compile changes I made here, but for an
> initial patch, things look pretty darn wonderful.

	[snip compile fixes .. integrated]

> VFS: Mounted root (ext2 filesystem) readonly.
> Freeing unused kernel memory: 196k freed
> Adding Swap: 265064k swap-space (priority 2)
> VM: Bad swap entry 00011e00
> VM: Bad swap entry 00058d00
> Unused swap offset entry in swap_dup 00058d00
> Unused swap offset entry in swap_dup 00011e00
> VM: Bad swap entry 00011e00
> VM: Bad swap entry 00058d00

Heh, I guess do_swap_page isn't too happy when multiple threads
of the same program take a page fault at the same address at the
same time.

I take it you were testing something like mysql, jvm or apache2 ?

regards,

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

		http://www.surriel.com/
http://www.conectiva.com/	http://distro.conectiva.com.br/

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