linux-kernel - Re: [PATCH 02/16] DRBD: lru

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Message-ID: <20090504161503.GC8728@soda.linbit>
Date:	Mon, 4 May 2009 18:15:03 +0200
From:	Lars Ellenberg <lars.ellenberg@...bit.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Kyle Moffett <kyle@...fetthome.net>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	Greg KH <gregkh@...e.de>, Neil Brown <neilb@...e.de>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Sam Ravnborg <sam@...nborg.org>, Dave Jones <davej@...hat.com>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Lars Marowsky-Bree <lmb@...e.de>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: [PATCH 02/16] DRBD: lru_cache

On Mon, May 04, 2009 at 12:12:07PM -0400, Rik van Riel wrote:
> Kyle Moffett wrote:
>> On Sun, May 3, 2009 at 8:48 PM, Kyle Moffett <kyle@...fetthome.net> wrote:
>>> There are a couple trivial tunables you can apply to the model I
>>> provided to dramatically change the effect of memory pressure on the
>>> LRU:
>>>
>>> [...]
>>>
>>
>> Ooh, I forgot to mention another biggie:  There's a way to allocate a
>> reserve pool of memory (I don't remember the exact API, sorry), which
>> can be attached to a specific kmem_cache to be used by processes
>> attempting writeout.  This would allow you to allocate more in-use
>> elements to make forward progress, even if all of your existing
>> elements are already in-use.
>
> Lars,
>
> is using a mempool for allocation, in combination with a
> shrinker callback for freeing older entries an option for
> DRBD?
>
> It looks like that could get rid of a fair amount of custom infrastructure.

I'm going to look into it.


	Lars
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