linux-kernel - Re: [PATCH try 5] CFS: Add hierarchical tree-based penalty.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <8358526.1721286876359420.JavaMail.root@ifrit.dereferenced.org>
Date:	Tue, 12 Oct 2010 13:39:19 +0400 (MSD)
From:	William Pitcock <nenolod@...eferenced.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, efault@....de,
	kernel@...ivas.org
Subject: Re: [PATCH try 5] CFS: Add hierarchical tree-based penalty.

Hi,

----- "Ingo Molnar" <mingo@...e.hu> wrote:

> * William Pitcock <nenolod@...eferenced.org> wrote:
> 
> > Inspired by the recent change to BFS by Con Kolivas, this patch
> causes 
> > vruntime to be penalized based on parent depth from their root task
> 
> > group.
> > 
> > I have, for the moment, decided to make it a default feature since
> the 
> > design of CFS ensures that broken applications depending on task 
> > enqueue behaviour behaving traditionally will continue to work.
> 
> Just curious, is this v5 submission a reply to Peter's earlier review
> of 
> your v3 patch? If yes then please explicitly outline the changes you
> did 
> so that Peter and others do not have to guess about the direction your
> 
> work is taking.

I just did that in the email I just sent.  Simply put, I was talking with
Con a few weeks ago about the concept of having a maximum amount of service
for all threads belonging to a process.  This did not work out so well, so
Con proposed penalizing based on fork depth, which still allows us to maintain
interactivity with make -j64 running in the background.

Actually, I lie: it works great for server scenarios where you have some
sysadmin also running azureus.  Azureus gets penalized instead, but other
apps like audacious get penalized too.

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