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Date: Sun, 3 May 2009 21:01:21 -0400
Message-ID: <f73f7ab80905031801n1e5ed6b6h84772baabda5f71e@mail.gmail.com>
Subject: Re: [PATCH 02/16] DRBD: lru_cache
From: Kyle Moffett <kyle@moffetthome.net>
To: Lars Ellenberg <lars.ellenberg@linbit.com>
Cc: Philipp Reisner <philipp.reisner@linbit.com>, linux-kernel@vger.kernel.org,
       Jens Axboe <jens.axboe@oracle.com>, Greg KH <gregkh@suse.de>,
       Neil Brown <neilb@suse.de>,
       James Bottomley <James.Bottomley@hansenpartnership.com>,
       Sam Ravnborg <sam@ravnborg.org>, Dave Jones <davej@redhat.com>,
       Nikanth Karthikesan <knikanth@suse.de>,
       Lars Marowsky-Bree <lmb@suse.de>,
       "Nicholas A. Bellinger" <nab@linux-iscsi.org>,
       Bart Van Assche <bart.vanassche@gmail.com>
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On Sun, May 3, 2009 at 8:48 PM, Kyle Moffett <kyle@moffetthome.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.

Cheers,
Kyle Moffett