linux-kernel - Re: [PATCH 4/5] writeback: per task dirty rate limit

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Message-ID: <20110810181854.GD3396@redhat.com>
Date:	Wed, 10 Aug 2011 14:18:54 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] writeback: per task dirty rate limit

On Wed, Aug 10, 2011 at 11:29:54AM +0800, Wu Fengguang wrote:

[..]
> > > -	ratelimit = ratelimit_pages;
> > > -	if (mapping->backing_dev_info->dirty_exceeded)
> > > +	ratelimit = current->nr_dirtied_pause;
> > > +	if (bdi->dirty_exceeded)
> > >  		ratelimit = 8;
> > 
> > Should we make sure that ratelimit is more than 8? It could be that
> > ratelimit is 1 and we set it higher (just reverse of what we wanted?)
> 
> Good catch! I actually just fixed it in that direction :)
> 
>         if (bdi->dirty_exceeded)
> -               ratelimit = 8;
> +               ratelimit = min(ratelimit, 32 >> (PAGE_SHIFT - 10));

With page size 64K, will above lead to retelimit 0? Is that what you want.
I wouldn't think so.

Thanks
Vivek
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