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Message-ID: <20070514204651.GA7242@redhat.com> Date: Mon, 14 May 2007 16:46:52 -0400 From: Dave Jones <davej@...hat.com> To: Rob Landley <rob@...dley.net> Cc: Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: tracking down disk spinups. On Mon, May 14, 2007 at 04:28:35PM -0400, Rob Landley wrote: > On Monday 14 May 2007 2:57 pm, Dave Jones wrote: > > Why did the kernel ignore what I told it to do ? > > I'm sure it thinks it knows better than me for a reason, but > > I'd like to know what it is. > > Remount doesn't switch filesystem drivers, it tells the existing filesystem > driver to accept new flags and/or a new option string. yes, I had misinterpreted what 'remount' did. I thought behind the scenes it actually did a umount/mount. > To switch drivers you have to umount the old sucker and mount the new one. > (The idea of handing off consistent cache data from one mounted filesystem > driver to another... Ouch.) a umount would purge the cache, but that's irrelevant given it doesn't work that way. Anyways, I rebooted after s/ext3/ext2/ on my fstab, and found things hadn't really got any more obvious what was going on. Instead of 'kjournald' writing stuff out, now it's 'pdflush'. *has sudden brainwave* Ahh, it's doing atime updates. Duh. Dave -- http://www.codemonkey.org.uk - 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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