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Subject: Re: [PATCH 15/18] writeback: charge leaked page dirties to active
 tasks
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: linux-fsdevel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
        Jan Kara <jack@suse.cz>, Christoph Hellwig <hch@lst.de>,
        Dave Chinner <david@fromorbit.com>, Greg Thelen <gthelen@google.com>,
        Minchan Kim <minchan.kim@gmail.com>, Vivek Goyal <vgoyal@redhat.com>,
        Andrea Righi <arighi@develer.com>, linux-mm <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>
Date: Tue, 06 Sep 2011 18:16:36 +0200
In-Reply-To: <20110904020916.588150387@intel.com>
References: <20110904015305.367445271@intel.com>
	 <20110904020916.588150387@intel.com>
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On Sun, 2011-09-04 at 09:53 +0800, Wu Fengguang wrote:
> The solution is to charge the pages dirtied by the exited gcc to the
> other random gcc/dd instances.

random dirtying task, seeing it lacks a !strcmp(t->comm, "gcc") || !
strcmp(t->comm, "dd") clause.

>  It sounds not perfect, however should
> behave good enough in practice. 

Seeing as that throttled tasks aren't actually running so those that are
running are more likely to pick it up and get throttled, therefore
promoting an equal spread.. ?

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 15/18] writeback: charge leaked page dirties to active
 tasks
Date: Tue, 06 Sep 2011 18:16:36 +0200
Message-ID: <1315325796.14232.20.camel@twins>
References: <20110904015305.367445271@intel.com>
	 <20110904020916.588150387@intel.com>
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Cc: linux-fsdevel@vger.kernel.org, Andrew Morton
 <akpm@linux-foundation.org>,  Jan Kara <jack@suse.cz>, Christoph Hellwig
 <hch@lst.de>, Dave Chinner <david@fromorbit.com>, Greg Thelen
 <gthelen@google.com>, Minchan Kim <minchan.kim@gmail.com>, Vivek Goyal
 <vgoyal@redhat.com>,  Andrea Righi <arighi@develer.com>, linux-mm
 <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <20110904020916.588150387@intel.com>
Sender: owner-linux-mm@kvack.org
List-Id: linux-fsdevel.vger.kernel.org

On Sun, 2011-09-04 at 09:53 +0800, Wu Fengguang wrote:
> The solution is to charge the pages dirtied by the exited gcc to the
> other random gcc/dd instances.

random dirtying task, seeing it lacks a !strcmp(t->comm, "gcc") || !
strcmp(t->comm, "dd") clause.

>  It sounds not perfect, however should
> behave good enough in practice.=20

Seeing as that throttled tasks aren't actually running so those that are
running are more likely to pick it up and get throttled, therefore
promoting an equal spread.. ?

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