Subject: Re: i/o scheduling (was Re: NEW_BUFQ_STRATEGY)
To: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
From: Daniel Carosone <dan@geek.com.au>
List: tech-kern
Date: 12/18/2003 10:02:14 
On Thu, Dec 18, 2003 at 07:50:37AM +0900, YAMAMOTO Takashi wrote:
> my understanding is,
> - page is PG_BUSY during write back.  if we keep a delayed write
>   request at buffer queue forever, the page will be left PG_BUSY forever.
> - getpages will wait on the PG_BUSY page.

This sounds like it could already be causing noticable
performance/concurrency issues, even without extra delays?

--
Dan.