linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <20070805125847.GC22060@elte.hu>
Date:	Sun, 5 Aug 2007 14:58:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	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


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > The only remotely valid compatibility argument would be Mutt - but even 
> > that handles it just fine. (we broke way more software via noexec)
> 
> And went through a sensible process of resolving it.
>
> And its not just mutt. HSM stuff stops working which is a big deal as 
> stuff clogs up. The /tmp/ cleaning tools go wrong as well.

what OSS HSM software stops working and what is its failure mode? /tmp 
cleaning tools will work _just fine_ if we report back max(mtime,ctime) 
as atime - they'll zap more /tmp stuff as they used to. There's no 
guarantee for /tmp contents anyway if tmpwatch is running. Or the patch 
below.

	Ingo

--- /etc/cron.daily/tmpwatch.orig	2007-08-05 14:44:25.000000000 +0200
+++ /etc/cron.daily/tmpwatch	2007-08-05 14:45:10.000000000 +0200
@@ -1,9 +1,9 @@
 #! /bin/sh
-/usr/sbin/tmpwatch -x /tmp/.X11-unix -x /tmp/.XIM-unix -x /tmp/.font-unix \
+/usr/sbin/tmpwatch --mtime -x /tmp/.X11-unix -x /tmp/.XIM-unix -x /tmp/.font-unix \
 	-x /tmp/.ICE-unix -x /tmp/.Test-unix 10d /tmp
-/usr/sbin/tmpwatch 30d /var/tmp
+/usr/sbin/tmpwatch --mtime 30d /var/tmp
 for d in /var/{cache/man,catman}/{cat?,X11R6/cat?,local/cat?}; do
     if [ -d "$d" ]; then
-	/usr/sbin/tmpwatch -f 30d "$d"
+	/usr/sbin/tmpwatch --mtime -f 30d "$d"
     fi
 done
-
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