linux-kernel - Re: [patch] CFS scheduler, -v12

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Sat, 19 May 2007 15:27:54 +0200
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	"Peter Williams" <pwil3058@...pond.net.au>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] CFS scheduler, -v12

On 18/05/07, Peter Williams <pwil3058@...pond.net.au> wrote:
> [...]
> One thing that might work is to jitter the load balancing interval a
> bit.  The reason I say this is that one of the characteristics of top
> and gkrellm is that they run at a more or less constant interval (and,
> in this case, X would also be following this pattern as it's doing
> screen updates for top and gkrellm) and this means that it's possible
> for the load balancing interval to synchronize with their intervals
> which in turn causes the observed problem.  A jittered load balancing
> interval should break the synchronization.  This would certainly be
> simpler than trying to change the move_task() logic for selecting which
> tasks to move.

Just an(quick) another idea. Say, the load balancer would consider not
only p->load_weight but also something like Tw(task) =
(time_spent_on_runqueue / total_task's_runtime) * some_scale_constant
as an additional "load" component (OTOH, when a task starts, it takes
some time for this parameter to become meaningful). I guess, it could
address the scenarios your have described (but maybe break some others
as well :) ...
Any hints on why it's stupid?


>
> Peter
> --
> Peter Williams                                   pwil3058@...pond.net.au

-- 
Best regards,
Dmitry Adamushko
-
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/