Re: User space out of memory approach

[Andrea Arcangeli <andrea@suse.de>]

On Fri, Jan 28, 2005 at 11:21:11AM -0400, Mauricio Lin wrote:
> As you know, Andrew generated the patch. Here goes some test results
> about your OOM Killer and the Original OOm Killer. We accomplished 10
> experiments for each OOM Killer and below are average values.
> 
> "Invocations" is the number of times that out_of_memory function is
> called. "Selections" is the number of times that select_bad_process
> function is called and "Killed" is the number of killed process.
> 
> Original OOM Killer
> Invocations average = 51620/10 = 5162
> Selections average = 30/10 = 3
> Killed average = 38/10 = 3.8
> 
> Andrea OOM Killer
> Invocations average = 213/10 = 21.3
> Selections average = 213/10 = 21.3
> Killed average = 52/10 = 5.2
> 
> As you can see the number of invocations reduced significantly using
> your OOM Killer.

Yep, thanks for testing!

> I did not know about this problem when I was moving the original
> ranking algorithm to userland. As Thomaz mentioned: invocation
> madness, reentrancy problems and those strange timers and counter as
> now, since, last, lastkill and count. I guess that now i can put some
> OOM Killer stuffs in userland in a safer manner with those problems
> solved, right?

Yep ;)

> BTW, will your OOM Killer be included in the kernel tree?

Yes, Andrew said it should go in the next few days, which is a great
news, thanks everyone!