Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
* Michael Biebl bi...@debian.org wrote: CCing Jon, as maintainer of libcgroup he might be interested in this discussion. Am 07.09.2010 23:12, schrieb Bastian Blank: On Tue, Sep 07, 2010 at 10:54:04PM +0200, Michael Biebl wrote: On 07.09.2010 22:41, Bastian Blank wrote: And what does this help? There are n cgroup filesystem hierarchies. Are you referring to cgroup fs like cpuset? They would be mounted below /sys/fs/cgroup. sysfs does not support mkdir. How will you mount _n_ different hierarchies? In the thread I quoted, G-K H mentions that /sys/fs/cgroup would be a tmpfs. I agree with not creating another top-level directory. I configured libcgroup to mount cgroupfs under /mnt/cgroup as an initial solution, but mounting in /sys/fs seems much more consistent with current conventions. As it is private to systemd anyway, the correct locations is somewhere below /var/lib/ As systemd requires the cgroupfs during early boot, /var/lib is not an option. There are other locations. /sys is system wide and not daemon specific. I remember discussions, where to mount the cgroupfs [1], some while ago, and /sys was among the recommendations. More importantly though, it was said that we should see what the kernel folks do. This discussion took place on the libcgroup mailing list as well [1], posting here for reference. Many suggested somewhere under /sys, but I don't believe a consensus was reached. [1]: http://sourceforge.net/mailarchive/message.php?msg_id=20091104063005.GC3560%40balbir.in.ibm.com Cheers -- Jon -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100914135146.ga1...@starquasia
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
On Tue, Sep 14, 2010 at 09:51:49AM -0400, Jon Bernard wrote: * Michael Biebl bi...@debian.org wrote: CCing Jon, as maintainer of libcgroup he might be interested in this discussion. Am 07.09.2010 23:12, schrieb Bastian Blank: On Tue, Sep 07, 2010 at 10:54:04PM +0200, Michael Biebl wrote: On 07.09.2010 22:41, Bastian Blank wrote: And what does this help? There are n cgroup filesystem hierarchies. Are you referring to cgroup fs like cpuset? They would be mounted below /sys/fs/cgroup. sysfs does not support mkdir. How will you mount _n_ different hierarchies? In the thread I quoted, G-K H mentions that /sys/fs/cgroup would be a tmpfs. I agree with not creating another top-level directory. I configured libcgroup to mount cgroupfs under /mnt/cgroup as an initial solution, but mounting in /sys/fs seems much more consistent with current conventions. Using /mnt/cgroup is definitely wrong. FHS says that /mnt is reserved as a temporary mountpoint for local use. If there is a consensus upstream that /sys/fs/cgroup is the right place for this filesystem, and this is needed in squeeze (rather than just for systemd) then I think we would add that directory in the kernel package for squeeze. Otherwise, this is for wheezy (and current experimental) only. Ben. -- Ben Hutchings We get into the habit of living before acquiring the habit of thinking. - Albert Camus -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100914145957.gf11...@decadent.org.uk
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
On 14.09.2010 16:59, Ben Hutchings wrote: On Tue, Sep 14, 2010 at 09:51:49AM -0400, Jon Bernard wrote: I agree with not creating another top-level directory. I configured libcgroup to mount cgroupfs under /mnt/cgroup as an initial solution, but mounting in /sys/fs seems much more consistent with current conventions. Using /mnt/cgroup is definitely wrong. FHS says that /mnt is reserved as a temporary mountpoint for local use. If there is a consensus upstream that /sys/fs/cgroup is the right place for this filesystem, This patch has ben acked by Paul Menage men...@google.com and Dhaval Giani dhaval.gi...@gmail.com Afaik Dhaval is the libcgroup upstream developer and Paul is the maintainer of the kernel cgroup code. And also as mentioned before, it will be in 2.6.36. I guess this can be considered as consensus upstream. and this is needed in squeeze (rather than just for systemd) then I think we would add that directory in the kernel package for squeeze. Otherwise, this is for wheezy (and current experimental) only. As we usually try to support running the old kernel from release (squeeze) in release+1(wheezy), this patch would ensure that systemd would easily run with a squeeze kernel (without any ugly workarounds). It would be future-proofing if you will. Cheers, Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth? signature.asc Description: OpenPGP digital signature
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
On Tue, Sep 14, 2010 at 06:29:10PM +0200, Michael Biebl wrote: On 14.09.2010 16:59, Ben Hutchings wrote: [...] and this is needed in squeeze (rather than just for systemd) then I think we would add that directory in the kernel package for squeeze. Otherwise, this is for wheezy (and current experimental) only. As we usually try to support running the old kernel from release (squeeze) in release+1(wheezy), this patch would ensure that systemd would easily run with a squeeze kernel (without any ugly workarounds). It would be future-proofing if you will. Who are we? You'd better tell Md about this new requirement. Ben. -- Ben Hutchings We get into the habit of living before acquiring the habit of thinking. - Albert Camus -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100914165724.gg11...@decadent.org.uk
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
]] Ben Hutchings | Who are we? You'd better tell Md about this new requirement. I, as the systemd maintainer would be much happier if it was possible to use wheezy's systemd with the lenny kernel, and with the (arguably large) assumption that it's just the mount point for cgroupfs, that doesn't sound like a huge extra burden to add to the kernel maintenance? -- Tollef Fog Heen UNIX is user friendly, it's just picky about who its friends are -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/87hbhstdce@qurzaw.linpro.no
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
Package: linux-2.6 Version: 2.6.32-21 Severity: wishlist File: /boot/vmlinuz-2.6.32-5-686 Hi, please consider cherry-picking the patch to mount cgroupfs at /sys/fs/cgroup [1]. This patch will be in upstream 2.6.36 and has been acked by the kernel cgroup and libcgroup maintainer. Having it in the default Debian kernel would simplify running systemd, which uses cgroups to monitor processes. Without this patch, the cgroupfs for systemd will be mounted at /cgroup and it would be preferable to not introduce another toplevel directory. Thanks for considering, Michael [1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=676db4af043014e852f67ba0349dae0071bd11f3 -- System Information: Debian Release: squeeze/sid APT prefers unstable APT policy: (500, 'unstable'), (1, 'experimental') Architecture: i386 (i686) Kernel: Linux 2.6.32-5-686 (SMP w/1 CPU core) Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages linux-image-2.6.32-5-686 depends on: ii debconf [debconf-2.0] 1.5.35 Debian configuration management sy ii initramfs-tools [linux-initra 0.98.2 tools for generating an initramfs ii linux-base2.6.32-21 Linux image base package ii module-init-tools 3.12-1 tools for managing Linux kernel mo Versions of packages linux-image-2.6.32-5-686 recommends: ii firmware-linux-free 2.6.32-21 Binary firmware for various driver ii libc6-i6862.11.2-5 Embedded GNU C Library: Shared lib Versions of packages linux-image-2.6.32-5-686 suggests: pn grub | lilo none (no description available) pn linux-doc-2.6.32 none (no description available) Versions of packages linux-image-2.6.32-5-686 is related to: pn firmware-bnx2 none (no description available) pn firmware-bnx2xnone (no description available) ii firmware-ipw2x00 0.26 Binary firmware for Intel Pro Wire pn firmware-ivtv none (no description available) pn firmware-iwlwifi none (no description available) ii firmware-linux0.26 Binary firmware for various driver ii firmware-linux-nonfree0.26 Binary firmware for various driver pn firmware-qlogic none (no description available) pn firmware-ralink none (no description available) pn xen-hypervisornone (no description available) -- debconf information excluded -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100907171915.2063.91589.report...@pluto.milchstrasse.xx
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
On Tue, Sep 07, 2010 at 07:19:15PM +0200, Michael Biebl wrote: please consider cherry-picking the patch to mount cgroupfs at /sys/fs/cgroup [1]. This patch will be in upstream 2.6.36 and has been acked by the kernel cgroup and libcgroup maintainer. And what does this help? There are n cgroup filesystem hierarchies. Without this patch, the cgroupfs for systemd will be mounted at /cgroup and it would be preferable to not introduce another toplevel directory. As it is private to systemd anyway, the correct locations is somewhere below /var/lib/ Bastian -- There's another way to survive. Mutual trust -- and help. -- Kirk, Day of the Dove, stardate unknown -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100907204131.ga22...@wavehammer.waldi.eu.org
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
On 07.09.2010 22:41, Bastian Blank wrote: On Tue, Sep 07, 2010 at 07:19:15PM +0200, Michael Biebl wrote: please consider cherry-picking the patch to mount cgroupfs at /sys/fs/cgroup [1]. This patch will be in upstream 2.6.36 and has been acked by the kernel cgroup and libcgroup maintainer. And what does this help? There are n cgroup filesystem hierarchies. Are you referring to cgroup fs like cpuset? They would be mounted below /sys/fs/cgroup. One idea behind this patch is, to provide a sane default by the kernel, so the userland does not mount it at random places, like /dev/cgroup, /cgroup or /mnt/cgroup. See also the discussion at [1]. Without this patch, the cgroupfs for systemd will be mounted at /cgroup and it would be preferable to not introduce another toplevel directory. As it is private to systemd anyway, the correct locations is somewhere below /var/lib/ As systemd requires the cgroupfs during early boot, /var/lib is not an option. Michael [1] http://lkml.org/lkml/2010/7/22/384 -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth? signature.asc Description: OpenPGP digital signature
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
On Tue, Sep 07, 2010 at 10:54:04PM +0200, Michael Biebl wrote: On 07.09.2010 22:41, Bastian Blank wrote: And what does this help? There are n cgroup filesystem hierarchies. Are you referring to cgroup fs like cpuset? They would be mounted below /sys/fs/cgroup. sysfs does not support mkdir. How will you mount _n_ different hierarchies? As it is private to systemd anyway, the correct locations is somewhere below /var/lib/ As systemd requires the cgroupfs during early boot, /var/lib is not an option. There are other locations. /sys is system wide and not daemon specific. Bastian -- Intuition, however illogical, is recognized as a command prerogative. -- Kirk, Obsession, stardate 3620.7 -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100907211225.ga23...@wavehammer.waldi.eu.org
Bug#595964: Please cherry-pick patch to mount cgroupfs at /sys/fs/cgroup
CCing Jon, as maintainer of libcgroup he might be interested in this discussion. Am 07.09.2010 23:12, schrieb Bastian Blank: On Tue, Sep 07, 2010 at 10:54:04PM +0200, Michael Biebl wrote: On 07.09.2010 22:41, Bastian Blank wrote: And what does this help? There are n cgroup filesystem hierarchies. Are you referring to cgroup fs like cpuset? They would be mounted below /sys/fs/cgroup. sysfs does not support mkdir. How will you mount _n_ different hierarchies? In the thread I quoted, G-K H mentions that /sys/fs/cgroup would be a tmpfs. As it is private to systemd anyway, the correct locations is somewhere below /var/lib/ As systemd requires the cgroupfs during early boot, /var/lib is not an option. There are other locations. /sys is system wide and not daemon specific. I remember discussions, where to mount the cgroupfs [1], some while ago, and /sys was among the recommendations. More importantly though, it was said that we should see what the kernel folks do. With the aforementioned patch, the kernel maintainers have more or less answered the question and as already said, this patch will land in .36 and the Debian kernel for that matter. Do you see any problems, why this patch should not be in the .32 (squeeze) kernel? Michael [1] http://lists.debian.org/debian-devel/2009/02/msg00037.html -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth? signature.asc Description: OpenPGP digital signature
