linux-kernel - Re: [PATCH 1/3] kthread: update s390 cmm driver to use kthread

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Date:	Mon, 28 Aug 2006 11:00:22 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] kthread: update s390 cmm driver to use kthread

On Fri, 2006-08-25 at 15:03 -0500, Serge E. Hallyn wrote:
> Ok, the patch in -mm does kthread_stop() on module_exit, but still uses
> the timer and cmm_thread_wait.  

Yes, the timer and cmm_thread_wait are there to implement the timed page
pool.

> I'm not clear what the timer is actually trying to do, or why there is a
> separate cmm_pages_target and cmm_timed_pages_target.  So I'm sure the
> below patch on top of -mm2 is wrong (it compiles, but I just noticed
> 2.6.18-rc4-mm2 doesn't boot without this patch either) but hopefully
> Heiko or Martin can tell me what would be the right way, or implement
> it?

Yes, it is wrong. Trying to "fix" code without understanding it is waste
of time. The while loop in the cmm_thread is supposed to continue until
the target numbers for the standard page pool and the timed page pool
have been reached. Your patch adds a schedule_timeout between every call
to cmm_alloc_pages.

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.


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