Messages in this thread | | | Date | Thu, 26 Mar 2009 09:24:54 -0700 | From | Andrew Morton <> | Subject | Re: relatime: update once per day patches (was: ext3 IO latency measurements) |
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On Thu, 26 Mar 2009 09:14:28 -0700 (PDT) Linus Torvalds <torvalds@linux-foundation.org> wrote:
> > > On Thu, 26 Mar 2009, Andrew Morton wrote: > > > > Hard-wiring a 24-hour interval into the core VFS for all mounted > > filesystems is dumb. > > Umm. > > I generally agree witht he "leave policy to user space" people, but this > is an area where (a) user space has shown itself to not get it right (ie > people don't do even the existing relatime because distros don't) and (b) > what's the alternative? > > > I (and others) pointed out that it would be better to implement this as > > a mount option. That suggestion was met with varying sillinesses and > > that is where things stand. > > I'd suggest first just doing the 24 hour thing, and then, IF user space > actually ever gets its act together, and people care, and they _ask_ for a > mount option, that's when it's worth doing. >
We wouldn't normally just enable the new feature by default because it changes kernel behaviour. Userspace needs to be changed in some manner to opt-in. One way it's `mount -o remount', the other way it's a poke in /proc.
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