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Date: Mon, 6 Aug 2007 15:12:15 +0200 From: Willy Tarreau <w@....eu> To: Ingo Molnar <mingo@...e.hu> Cc: Alan Cox <alan@...rguk.ukuu.org.uk>, Claudio Martins <ctpm@....utl.pt>, Jeff Garzik <jeff@...zik.org>, Jörn Engel <joern@...fs.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, miklos@...redi.hu, akpm@...ux-foundation.org, neilb@...e.de, dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com, trond.myklebust@....uio.no, yingchao.zhou@...il.com, richard@....demon.co.uk, david@...g.hm Subject: Re: [PATCH 00/23] per device dirty throttling -v8 On Mon, Aug 06, 2007 at 08:57:12AM +0200, Ingo Molnar wrote: > > * Willy Tarreau <w@....eu> wrote: > > > In your example above, maybe it's the opposite, users know they can > > keep a file in /tmp one more week by simply cat'ing it. > > sure - and i'm not arguing that noatime should the kernel-wide default. > In every single patch i sent it was a .config option (and a boot option > _and_ a sysctl option that i think you missed) that a user/distro > enables or disabled. But i think the /tmp argument is not very strong: > /tmp is fundamentally volatile, and you can grow dependencies on pretty > much _any_ aspect of the kernel. So the question isnt "is there impact" > (there is, at least for noatime), the question is "is it still worth > doing it". > > > Changing the kernel in a non-easily reversible way is not kind to the > > users. > > none of my patches did any of that... I did not notice you talked about a sysctl. A sysctl provides the ability to switch the behaviour without rebooting, while both the config option and the command line require a reboot. > anyway, my latest patch doesnt do noatime, it does the "more intelligent > relatime" approach. ... which is not equivalent noatime in the initial example. Regards, Willy - 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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