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Date: Mon, 14 Dec 2009 20:54:28 +0000 From: Matthew Garrett <mjg59@...f.ucam.org> To: Jens Axboe <jens.axboe@...cle.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] laptop-mode: Make flushes per-device On Mon, Dec 14, 2009 at 08:58:06PM +0100, Jens Axboe wrote: > On Mon, Dec 14 2009, Matthew Garrett wrote: > > One of the features of laptop-mode is that it forces a writeout of dirty > > pages if something else triggers a physical read or write from a device. > > The current implementation flushes pages on all devices, rather than only > > the one that triggered the flush. This patch alters the behaviour so that > > only the recently accessed block device is flushed, preventing other > > disks being spun up for no terribly good reason. > > A few comments... Perhaps the timer deletion should go into the backing, > since that is where it's sitting? That was for symmetry with the setup, but I'm not married to it. > Also, I think it would be cleaner to queue the flush work from the timer > on the per-bdi thread, instead of having a work struct allocated and > using that work item to simply call bdi writeback instead. I had a vague recollection of context awkwardness, but I may have been wrong there. I'll try that. -- Matthew Garrett | mjg59@...f.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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