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Message-ID: <20120123210327.GO25986@redhat.com> Date: Mon, 23 Jan 2012 16:03:27 -0500 From: Vivek Goyal <vgoyal@...hat.com> To: Tejun Heo <tj@...nel.org> Cc: Lennart Poettering <mzxreary@...inter.de>, axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 08/17] blkcg: shoot down blkio_groups on elevator switch On Mon, Jan 23, 2012 at 12:47:57PM -0800, Tejun Heo wrote: > Hello, Lennart. > > On Mon, Jan 23, 2012 at 09:43:52PM +0100, Lennart Poettering wrote: > > I didn't really follow the whole discussion here, but if this is about > > adjusting parameters of a block device as the block device shows up this > > must necessarily happen in an udev rule (and not in a daemon watching > > block devices using libudev), since you most likely need the > > synchronicity: i.e. you want to avoid that normal (libudev-using) > > userspace code ever sees the device before those params are written to > > the device. A daemon asynchronously watching the devices with libudev > > for adjusting such tunables is necessarily racy. > > Yeap, this needs to be synchronous so that it's configured before the > rest of system notices the device. Vivek, can you please ask the > tuned guys to take a look? Sure I will. Thanks. Vivek -- 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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