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Message-ID: <20090223071802.GK29783@kernel.dk> Date: Mon, 23 Feb 2009 08:18:02 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: "Gao, Yunpeng" <yunpeng.gao@...el.com> Cc: "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: help! locks problem in block layer request queue? (please don't top post reply to emails...) On Sat, Feb 21 2009, Gao, Yunpeng wrote: > Really awesome! This is a big bug. I have re-write the code of > processing requests from the request queue. The new code is copied > from drivers/mtd/mtd_blkdevs.c and did some necessary modifies. Now it > works well. Many thanks to you :) Glad that it now works :-) > BTW, I noticed that MTD driver (drivers/mtd/mtd_blkdevs.c) and MMC > driver (drivers/mmc/card/block.c and queue.c) also register a block > device, and they create a kernel thread to process the request queue > instead of process it directly. Why they do it like that? Is there any > special reason for that? If your request handling is slow, then it is often better to push request handling to a dedicated thread. That may be the case if your device can't do DMA for instance, and you have to transfer all the data manually. Pushing that to a thread usually makes it easy to do that with interrupts enabled and is thus nicer to the rest of the system. -- Jens Axboe -- 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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