Subject: Re: i/o scheduling (was Re: NEW_BUFQ_STRATEGY)
To: YAMAMOTO Takashi <firstname.lastname@example.org>
From: Daniel Carosone <email@example.com>
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?