linux-kernel - Re: [PATCH] sunrpc: make the cache cleaner workqueue deferrable

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Date:	Mon, 05 Jul 2010 15:31:30 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Neil Brown <neilb@...e.de>, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] sunrpc: make the cache cleaner workqueue deferrable

On Thu, 2010-07-01 at 18:05 +0300, Artem Bityutskiy wrote:
> From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> 
> This patch makes the cache_cleaner workqueue deferrable, to prevent
> unnecessary system wake-ups, which is very important for embedded
> battery-powered devices.
> 
> do_cache_clean() is called every 30 seconds at the moment, and often
> makes the system wake up from its power-save sleep state. With this
> change, when the workqueue uses a deferrable timer, the
> do_cache_clean() invocation will be delayed and combined with the
> closest "real" wake-up. This improves the power consumption situation.
> 
> Note, I tried to create a DECLARE_DELAYED_WORK_DEFERRABLE() helper
> macro, similar to DECLARE_DELAYED_WORK(), but failed because of the
> way the timer wheel core stores the deferrable flag (it is the
> LSBit in the time->base pointer). My attempt to define a static
> variable with this bit set ended up with the "initializer element is
> not constant" error.
> 
> Thus, I have to use run-time initialization, so I created a new
> cache_initialize() function which is called once when sunrpc is
> being initialized.
> 
> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>

Bruce,

I did some git-logging, and found out that sunrpc stuff goes from you,
from Trond, and from David, and MAINTAINERS also mentions Neil. Whom
should I ping WRT to merging this patch?

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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