- 29 Apr, 2008 40 commits
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Pavel Emelyanov authored
The resource counter is supposed to facilitate the resource accounting of arbitrary resource (and it already does this for memory controller). However, it is about to be used in other resources controllers (swap, kernel memory, networking, etc), so provide a doc describing how to work with it. This will eliminate all the possible future duplications in the appropriate controllers' docs. Fixed errors pointed out by Randy. [akpm@linux-foundation.org: fix documentation tpyo] Signed-off-by:
Pavel Emelyanov <xemul@openvz.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Pavel Emelyanov authored
This field is the maximal value of the usage one since the counter creation (or since the latest reset). To reset this to the usage value simply write anything to the appropriate cgroup file. Signed-off-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by:
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Balbir Singh authored
Remove the mem_cgroup member from mm_struct and instead adds an owner. This approach was suggested by Paul Menage. The advantage of this approach is that, once the mm->owner is known, using the subsystem id, the cgroup can be determined. It also allows several control groups that are virtually grouped by mm_struct, to exist independent of the memory controller i.e., without adding mem_cgroup's for each controller, to mm_struct. A new config option CONFIG_MM_OWNER is added and the memory resource controller selects this config option. This patch also adds cgroup callbacks to notify subsystems when mm->owner changes. The mm_cgroup_changed callback is called with the task_lock() of the new task held and is called just prior to changing the mm->owner. I am indebted to Paul Menage for the several reviews of this patchset and helping me make it lighter and simpler. This patch was tested on a powerpc box, it was compiled with both the MM_OWNER config turned on and off. After the thread group leader exits, it's moved to init_css_state by cgroup_exit(), thus all future charges from runnings threads would be redirected to the init_css_set's subsystem. Signed-off-by:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by:
Pekka Enberg <penberg@cs.helsinki.fi> Reviewed-by:
Paul Menage <menage@google.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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Serge E. Hallyn authored
Introduce a read_seq() helper in cftype, which uses seq_file to print out lists. Use it in the devices cgroup. Also split devices.allow into two files, so now devices.deny and devices.allow are the ones to use to manipulate the whitelist, while devices.list outputs the cgroup's current whitelist. Signed-off-by:
Serge E. Hallyn <serue@us.ibm.com> Acked-by:
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Li Zefan authored
Now we can run through the hash table instead of running through the linked-list. Signed-off-by:
Li Zefan <lizf@cn.fujitsu.com> Reviewed-by:
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Li Zefan authored
We are at system boot and there is only 1 cgroup group (i,e, init_css_set), so we don't need to run through the css_set linked list. Neither do we need to run through the task list, since no processes have been created yet. Also referring to a comment in cgroup.h: struct css_set { ... /* * Set of subsystem states, one for each subsystem. This array * is immutable after creation apart from the init_css_set * during subsystem registration (at boot time). */ struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; } Signed-off-by: -
Li Zefan authored
When we attach a process to a different cgroup, the css_set linked-list will be run through to find a suitable existing css_set to use. This patch implements a hash table for better performance. The following benchmarks have been tested: For N in 1, 5, 10, 50, 100, 500, 1000, create N cgroups with one sleeping task in each, and then move an additional task through each cgroup in turn. Here is a test result: N Loop orig - Time(s) hash - Time(s) ---------------------------------------------- 1 10000 1.201231728 1.196311177 5 2000 1.065743872 1.040566424 10 1000 0.991054735 0.986876440 50 200 0.976554203 0.969608733 100 100 0.998504680 0.969218270 500 20 1.157347764 0.962602963 1000 10 1.619521852 1.085140172 Signed-off-by:
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Serge E. Hallyn authored
Implement a cgroup to track and enforce open and mknod restrictions on device files. A device cgroup associates a device access whitelist with each cgroup. A whitelist entry has 4 fields. 'type' is a (all), c (char), or b (block). 'all' means it applies to all types and all major and minor numbers. Major and minor are either an integer or * for all. Access is a composition of r (read), w (write), and m (mknod). The root device cgroup starts with rwm to 'all'. A child devcg gets a copy of the parent. Admins can then remove devices from the whitelist or add new entries. A child cgroup can never receive a device access which is denied its parent. However when a device access is removed from a parent it will not also be removed from the child(ren). An entry is added using devices.allow, and removed using devices.deny. For instance echo 'c 1:3 mr' > /cgroups/1/devices.allow allows cgroup 1 to read and mknod the device usually known as /dev/null. Doing echo a > /cgroups/1/devices.deny will remove the default 'a *:* mrw' entry. CAP_SYS_ADMIN is needed to change permissions or move another task to a new cgroup. A cgroup may not be granted more permissions than the cgroup's parent has. Any task can move itself between cgroups. This won't be sufficient, but we can decide the best way to adequately restrict movement later. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix may-be-used-uninitialized warning] Signed-off-by:
James Morris <jmorris@namei.org> Looks-good-to: Pavel Emelyanov <xemul@openvz.org> Cc: Daniel Hokka Zakrisson <daniel@hozac.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by:
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Pavel Emelyanov authored
Trigger callback can be used to receive a kick-up from the user space. The string written is ignored. The cftype->private is used for multiplexing events. Signed-off-by:
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Li Zefan authored
There is a race between create_proc_entry() and the assignment of file ops. proc_create() is invented to fix it. Signed-off-by:
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Li Zefan authored
It is called by cgroup_init() and cgroup_init_early() only, which are annotated with __init. Signed-off-by:
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Paul Menage authored
This removes some filesystem boilerplate from the CFS cgroup subsystem. Signed-off-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Paul Menage authored
These patches add cgroups read_s64 and write_s64 control file methods (the signed equivalent of read_u64/write_u64) and use them to implement the cpu.rt_runtime_us control file in the CFS cgroup subsystem. This patch: These are the signed equivalents of the read_u64/write_u64 methods Signed-off-by:
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Paul Menage authored
The cgroup debug subsystem isn't generally useful for users. It should default to "n". Signed-off-by:
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Paul Menage authored
The "releasable" control file provided by the cgroup framework exports the state of a per-cgroup flag that's related to the notify-on-release feature. This isn't really generally useful, unless you're trying to debug this particular feature of cgroups. This patch moves the "releasable" file to the cgroup_debug subsystem. Signed-off-by:
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Paul Menage authored
This function isn't needed - a NULL pointer in the cftype read function will result in the same EINVAL response to userspace. Signed-off-by:
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Paul Menage authored
Remove the seq_file boilerplate used to construct the memcontrol stats map, and instead use the new map representation for cgroup control files Signed-off-by:
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Paul Menage authored
Adds a new type of supported control file representation, a map from strings to u64 values. Each map entry is printed as a line in a similar format to /proc/vmstat, i.e. "$key $value\n" Signed-off-by:
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Paul Menage authored
Many of the cpusets control files are simple integer values, which don't require the overhead of memory allocations for reads and writes. Move the handlers for these control files into cpuset_read_u64() and cpuset_write_u64(). [akpm@linux-foundation.org: ad dmissing `break'] Signed-off-by:
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Paul Menage authored
This removes the need for people to remember to pass the -n flag to echo when writing values to cgroup control files. Signed-off-by:
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Paul Menage authored
Update the memory controller to use read_u64 for its limit/usage/failcnt control files, calling the new res_counter_read_u64() function. Signed-off-by:
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Paul Menage authored
Adds a function for returning the value of a resource counter member, in a form suitable for use in a cgroup read_u64 control file method. Signed-off-by:
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Paul Menage authored
Several people have justifiably complained that the "_uint" suffix is inappropriate for functions that handle u64 values, so this patch just renames all these functions and their users to have the suffic _u64. [peterz@infradead.org: build fix] Signed-off-by:
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Adrian Bunk authored
Every file should include the headers containing the externs its global functions (in this case for ns_cgroup_clone()). Signed-off-by:
Adrian Bunk <bunk@kernel.org> Acked-by:
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Paul Jackson authored
Fix a code warning: symbol 'p' shadows an earlier one This is a reincarnation of Harvey Harrison's patch: cpuset: sparse warnings in cpuset.c Independently, Cliff Wickman moved the affected code, from kernel/cpuset.c to kernel/cgroup.c, in his patch: cpusets: update_cpumask revision Signed-off-by:
Paul Jackson <pj@sgi.com> Cc: Harvey Harrison <harvey.harrison@gmail.com> Cc: Cliff Wickman <cpw@sgi.com> Acked-by:
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Adrian Bunk authored
Make the needlessly global cgroup_enable_task_cg_lists() static. Signed-off-by:
David Rientjes <rientjes@google.com> Cc: Paul Menage <menage@google.com> Signed-off-by:
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Andres Salomon authored
This adds support for OLPC XO hardware. Open Firmware on XOs don't contain the VSA, so it is necessary to emulate the PCI BARs in the kernel. This also adds functionality for running EC commands, and a CONFIG_OLPC. A number of OLPC drivers depend upon CONFIG_OLPC. olpc_ec_timeout is a hack to work around Embedded Controller bugs. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: geode_has_vsa build fix] [akpm@linux-foundation.org: olpc_register_battery_callback doesn't exist] Signed-off-by:
Andres Salomon <dilinger@debian.org> Acked-by:
Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@suse.de> Cc: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by:
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Michael Halcrow authored
Make sure crypt_stat->flags is protected with a lock in ecryptfs_open(). Signed-off-by:
Michael Halcrow <mhalcrow@us.ibm.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by:
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Michael Halcrow authored
Make eCryptfs key module subsystem respect namespaces. Since I will be removing the netlink interface in a future patch, I just made changes to the netlink.c code so that it will not break the build. With my recent patches, the kernel module currently defaults to the device handle interface rather than the netlink interface. [akpm@linux-foundation.org: export free_user_ns()] Signed-off-by:
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Michael Halcrow authored
Update the versioning information. Make the message types generic. Add an outgoing message queue to the daemon struct. Make the functions to parse and write the packet lengths available to the rest of the module. Add functions to create and destroy the daemon structs. Clean up some of the comments and make the code a little more consistent with itself. [akpm@linux-foundation.org: printk fixes] Signed-off-by:
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Michael Halcrow authored
A regular device file was my real preference from the get-go, but I went with netlink at the time because I thought it would be less complex for managing send queues (i.e., just do a unicast and move on). It turns out that we do not really get that much complexity reduction with netlink, and netlink is more heavyweight than a device handle. In addition, the netlink interface to eCryptfs has been broken since 2.6.24. I am assuming this is a bug in how eCryptfs uses netlink, since the other in-kernel users of netlink do not seem to be having any problems. I have had one report of a user successfully using eCryptfs with netlink on 2.6.24, but for my own systems, when starting the userspace daemon, the initial helo message sent to the eCryptfs kernel module results in an oops right off the bat. I spent some time looking at it, but I have not yet found the cause. The netlink interface breaking gave me the motivation to just finish my patch to migrate to a regular device handle. If I cannot find out soon why the netlink interface in eCryptfs broke, I am likely to just send a patch to disable it in 2.6.24 and 2.6.25. I would like the device handle to be the preferred means of communicating with the userspace daemon from 2.6.26 on forward. This patch: Functions to facilitate reading and writing to the eCryptfs miscellaneous device handle. This will replace the netlink interface as the preferred mechanism for communicating with the userspace eCryptfs daemon. Each user has his own daemon, which registers itself by opening the eCryptfs device handle. Only one daemon per euid may be registered at any given time. The eCryptfs module sends a message to a daemon by adding its message to the daemon's outgoing message queue. The daemon reads the device handle to get the oldest message off the queue. Incoming messages from the userspace daemon are immediately handled. If the message is a response, then the corresponding process that is blocked waiting for the response is awakened. Signed-off-by:
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Miklos Szeredi authored
Callers of notify_change() need to hold i_mutex. Signed-off-by:
Miklos Szeredi <mszeredi@suse.cz> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by:
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Harvey Harrison authored
__FUNCTION__ is gcc-specific, use __func__ Signed-off-by:
Harvey Harrison <harvey.harrison@gmail.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by:
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Adrian Bunk authored
Remove the no longer used ecryptfs_header_cache_0. Signed-off-by:
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Harvey Harrison authored
Introduced between 2.6.25-rc2 and -rc3 drivers/block/xen-blkfront.c:139:5: warning: symbol 'blkif_getgeo' was not declared. Should it be static? Signed-off-by:
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Jan Engelhardt authored
A command that causes a line feed while a background color is active, such as perl -e 'print "x" x 60, "\e[44m", "x" x 40, "\e[0m\n"' and perl -e 'print "x" x 40, "\e[44m\n", "x" x 40, "\e[0m\n"' causes the line that was started as a result of the line feed to be completely filled with the currently active background color instead of the default color. When scrolling, part of the current screen is memcpy'd/memmove'd to the new region, and the new line(s) that will appear as a result are cleared using memset. However, the lines are cleared with vc->vc_video_erase_char, causing them to be colored with the currently active background color. This is different from X11 terminal emulators which always paint the new lines with the default background color (e.g. `xterm -bg black`). The clear operation (\e[1J and \e[2J) also use vc_video_erase_char, so a new vc->vc_scrl_erase_char is introduced with contains the erase character used for scrolling, which is built from vc->vc_def_color instead of vc->vc_color. Signed-off-by:
Jan Engelhardt <jengelh@computergmbh.de> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by:
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Thomas Petazzoni authored
Instead of using the malloc() and free() wrappers needed by the lib/inflate.c code for allocations, simply use kmalloc() and kfree() in the initramfs code. This is needed for a further lib/inflate.c-related cleanup patch that will remove the malloc() and free() functions. Take that opportunity to remove the useless kmalloc() return value cast. Based on work done by Matt Mackall. Signed-off-by:
Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by:
Matt Mackall <mpm@selenic.com> Cc: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by:
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Dave Young authored
Due to the rcupreempt.h WARN_ON trigged, I got 2G syslog file. For some serious complaining of kernel, we need repeat the warnings, so here I isolate the ratelimit part of printk.c to a standalone file. Signed-off-by:
Dave Young <hidave.darkstar@gmail.com> Acked-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by:
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OGAWA Hirofumi authored
We need to check ->s_dirt before calling write_super(). It became the cause of an unneeded write. This bug was noticed by Sudhanshu Saxena. Signed-off-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by:
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David Howells authored
Add missing consts to xattr function arguments. Signed-off-by:
David Howells <dhowells@redhat.com> Cc: Andreas Gruenbacher <agruen@suse.de> Signed-off-by:
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