linux/Documentation/cgroups, branch v3.4.83

memcg: oom: fix totalpages calculation for memory.swappiness==0

2012-11-26T19:37:45Z

commit 9a5a8f19b43430752067ecaee62fc59e11e88fa6 upstream. oom_badness() takes a totalpages argument which says how many pages are available and it uses it as a base for the score calculation. The value is calculated by mem_cgroup_get_limit which considers both limit and total_swap_pages (resp. memsw portion of it). This is usually correct but since fe35004fbf9e ("mm: avoid swapping out with swappiness==0") we do not swap when swappiness is 0 which means that we cannot really use up all the totalpages pages. This in turn confuses oom score calculation if the memcg limit is much smaller than the available swap because the used memory (capped by the limit) is negligible comparing to totalpages so the resulting score is too small if adj!=0 (typically task with CAP_SYS_ADMIN or non zero oom_score_adj). A wrong process might be selected as result. The problem can be worked around by checking mem_cgroup_swappiness==0 and not considering swap at all in such a case. Signed-off-by: Michal Hocko Acked-by: David Rientjes Acked-by: Johannes Weiner Acked-by: KOSAKI Motohiro Acked-by: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

memcg: fix up documentation on global LRU

2012-04-12T20:12:11Z

In v3.3-rc1, the global LRU was removed in commit 925b7673cce3 ("mm: make per-memcg LRU lists exclusive"). The patch fixes up the memcg docs. I left the swap session to someone who has better understanding of 'memory+swap'. Signed-off-by: Ying Han Acked-by: Michal Hocko Acked-by: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

documentation: remove references to cpu_*_map.

2012-03-29T05:08:31Z

This has been obsolescent for a while, fix documentation and misc comments. Signed-off-by: Rusty Russell

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2012-03-21T04:12:50Z

Pull trivial tree from Jiri Kosina: "It's indeed trivial -- mostly documentation updates and a bunch of typo fixes from Masanari. There are also several linux/version.h include removals from Jesper." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (101 commits) kcore: fix spelling in read_kcore() comment constify struct pci_dev * in obvious cases Revert "char: Fix typo in viotape.c" init: fix wording error in mm_init comment usb: gadget: Kconfig: fix typo for 'different' Revert "power, max8998: Include linux/module.h just once in drivers/power/max8998_charger.c" writeback: fix fn name in writeback_inodes_sb_nr_if_idle() comment header writeback: fix typo in the writeback_control comment Documentation: Fix multiple typo in Documentation tpm_tis: fix tis_lock with respect to RCU Revert "media: Fix typo in mixer_drv.c and hdmi_drv.c" Doc: Update numastat.txt qla4xxx: Add missing spaces to error messages compiler.h: Fix typo security: struct security_operations kerneldoc fix Documentation: broken URL in libata.tmpl Documentation: broken URL in filesystems.tmpl mtd: simplify return logic in do_map_probe() mm: fix comment typo of truncate_inode_pages_range power: bq27x00: Fix typos in comment ...

Documentation: Fix multiple typo in Documentation

2012-03-07T15:08:24Z

Signed-off-by: Masanari Iida Acked-by: Randy Dunlap Signed-off-by: Jiri Kosina

cgroup: remove cgroup_subsys argument from callbacks

2012-02-02T17:20:22Z

The argument is not used at all, and it's not necessary, because a specific callback handler of course knows which subsys it belongs to. Now only ->pupulate() takes this argument, because the handlers of this callback always call cgroup_add_file()/cgroup_add_files(). So we reduce a few lines of code, though the shrinking of object size is minimal. 16 files changed, 113 insertions(+), 162 deletions(-) text data bss dec hex filename 5486240 656987 7039960 13183187 c928d3 vmlinux.o.orig 5486170 656987 7039960 13183117 c9288d vmlinux.o Signed-off-by: Li Zefan Signed-off-by: Tejun Heo

memcg: fix pgpgin/pgpgout documentation

2012-01-13T04:13:06Z

The two memcg stats pgpgin/pgpgout have different meaning than the ones in vmstat, which indicates that we picked a bad naming for them. It might be late to change the stat name, but better documentation is always helpful. Signed-off-by: Ying Han Acked-by: KAMEZAWA Hiroyuki Acked-by: Johannes Weiner Acked-by: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Documentation/cgroups/memory.txt: fix typo

2012-01-13T04:13:06Z

It should be memsw.max_usage_in_bytes. This typo has been there for a really long time. Signed-off-by: Zhu Yanhai Acked-by: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2012-01-09T20:59:24Z

* 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits) cgroup: fix to allow mounting a hierarchy by name cgroup: move assignement out of condition in cgroup_attach_proc() cgroup: Remove task_lock() from cgroup_post_fork() cgroup: add sparse annotation to cgroup_iter_start() and cgroup_iter_end() cgroup: mark cgroup_rmdir_waitq and cgroup_attach_proc() as static cgroup: only need to check oldcgrp==newgrp once cgroup: remove redundant get/put of task struct cgroup: remove redundant get/put of old css_set from migrate cgroup: Remove unnecessary task_lock before fetching css_set on migration cgroup: Drop task_lock(parent) on cgroup_fork() cgroups: remove redundant get/put of css_set from css_set_check_fetched() resource cgroups: remove bogus cast cgroup: kill subsys->can_attach_task(), pre_attach() and attach_task() cgroup, cpuset: don't use ss->pre_attach() cgroup: don't use subsys->can_attach_task() or ->attach_task() cgroup: introduce cgroup_taskset and use it in subsys->can_attach(), cancel_attach() and attach() cgroup: improve old cgroup handling in cgroup_attach_proc() cgroup: always lock threadgroup during migration threadgroup: extend threadgroup_lock() to cover exit and exec threadgroup: rename signal->threadgroup_fork_lock to ->group_rwsem ... Fix up conflict in kernel/cgroup.c due to commit e0197aae59e5: "cgroups: fix a css_set not found bug in cgroup_attach_proc" that already mentioned that the bug is fixed (differently) in Tejun's cgroup patchset. This one, in other words.

Partial revert "Basic kernel memory functionality for the Memory Controller"

2011-12-23T03:37:18Z

This reverts commit e5671dfae59b165e2adfd4dfbdeab11ac8db5bda. After a follow up discussion with Michal, it was agreed it would be better to leave the kmem controller with just the tcp files, deferring the behavior of the other general memory.kmem.* files for a later time, when more caches are controlled. This is because generic kmem files are not used by tcp accounting and it is not clear how other slab caches would fit into the scheme. We are reverting the original commit so we can track the reference. Part of the patch is kept, because it was used by the later tcp code. Conflicts are shown in the bottom. init/Kconfig is removed from the revert entirely. Signed-off-by: Glauber Costa Acked-by: Michal Hocko CC: Kirill A. Shutemov CC: Paul Menage CC: Greg Thelen CC: Johannes Weiner CC: David S. Miller Conflicts: Documentation/cgroups/memory.txt mm/memcontrol.c Signed-off-by: David S. Miller