Messages in this thread | | | Date | Tue, 05 Sep 2006 19:02:34 +0400 | From | Kirill Korotaev <> | Subject | [PATCH] BC: resource beancounters (v4) (added user memory) |
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Core Resource Beancounters (BC) + kernel/user memory control.
BC allows to account and control consumption of kernel resources used by group of processes.
Draft UBC description on OpenVZ wiki can be found at http://wiki.openvz.org/UBC_parameters
The full BC patch set allows to control: - kernel memory. All the kernel objects allocatable on user demand should be accounted and limited for DoS protection. E.g. page tables, task structs, vmas etc.
- virtual memory pages. BCs allow to limit a container to some amount of memory and introduces 2-level OOM killer taking into account container's consumption. pages shared between containers are correctly charged as fractions (tunable).
- network buffers. These includes TCP/IP rcv/snd buffers, dgram snd buffers, unix, netlinks and other buffers.
- minor resources accounted/limited by number: tasks, files, flocks, ptys, siginfo, pinned dcache mem, sockets, iptentries (for containers with virtualized networking)
As the first step we want to propose for discussion the most complicated parts of resource management: kernel memory and virtual memory. The patch set to be sent provides core for BC and management of kernel memory only. Virtual memory management will be sent in a couple of days.
The patches in these series are: diff-atomic-dec-and-lock-irqsave.patch introduce atomic_dec_and_lock_irqsave()
diff-bc-kconfig.patch: Adds kernel/bc/Kconfig file with UBC options and includes it into arch Kconfigs
diff-bc-core.patch: Contains core functionality and interfaces of BC: find/create beancounter, initialization, charge/uncharge of resource, core objects' declarations.
diff-bc-task.patch: Contains code responsible for setting BC on task, it's inheriting and setting host context in interrupts.
Task contains three beancounters: 1. exec_bc - current context. all resources are charged to this beancounter. 2. fork_bc - beancounter which is inherited by task's children on fork
diff-bc-syscalls.patch: Patch adds system calls for BC management: 1. sys_get_bcid - get current BC id 2. sys_set_bcid - changes exec_ and fork_ BCs on current 3. sys_set_bclimit - set limits for resources consumtions 4. sys_get_bcstat - returns limits/usages/fails for BC
diff-bc-kmem-core.patch: Introduces BC_KMEMSIZE resource which accounts kernel objects allocated by task's request.
Objects are accounted via struct page and slab objects. For the latter ones each slab contains a set of pointers corresponding object is charged to.
Allocation charge rules: 1. Pages - if allocation is performed with __GFP_BC flag - page is charged to current's exec_bc. 2. Slabs - kmem_cache may be created with SLAB_BC flag - in this case each allocation is charged. Caches used by kmalloc are created with SLAB_BC | SLAB_BC_NOCHARGE flags. In this case only __GFP_BC allocations are charged.
diff-bc-kmem-charge.patch: Adds SLAB_BC and __GFP_BC flags in appropriate places to cause charging/limiting of specified resources.
diff-bc-vmlocked-core.patch: Introduces new resource BC_LOCKEDPAGES for accounting of mlock-ed user pages.
diff-bc-vmlocked-charge.patch: Places calls to BC core over the kernel to charge locked memory.
diff-bc-privvm.patch: This patch instroduces new resource - BC_PRIVVMPAGES. Privvmpages acointing is described in details in http://wiki.openvz.org/User_pages_accounting
diff-bc-vmrss-prep.patch: This patch intruduces small preparations for vmrss accounting to make reviewing simpler.
diff-bc-vmrss-core.patch: This is the core of vmrss accounting. Pages are accounted in fractions and it is described in details in http://wiki.openvz.org/RSS_fractions_accounting
diff-bc-vmrss-charge.patch: Calls to vmrss core code over the kernel to do accounting.
Summary of changes from v3 patch set:
* Added basic user pages accounting (lockedpages/privvmpages) * spell in Kconfig * Makefile reworked * EXPORT_SYMBOL_GPL * union w/o name in struct page * bc_task_charge is void now * adjust minheld/maxheld splitted
Summary of changes from v2 patch set:
* introduced atomic_dec_and_lock_irqsave() * bc_adjust_held_minmax comment * added __must_check for bc_*charge* funcs * use hash_long() instead of own one * bc/Kconfig is sourced from init/Kconfig now * introduced bcid_t type with comment from Alan Cox * check for barrier <= limit in sys_set_bclimit() * removed (bc == NULL) checks * replaced memcpy in beancounter_findcrate with assignment * moved check 'if (mask & BC_ALLOC)' out of the lock * removed unnecessary memset()
Summary of changes from v1 patch set:
* CONFIG_BEANCOUNTERS is 'n' by default * fixed Kconfig includes in arches * removed hierarchical beancounters to simplify first patchset * removed unused 'private' pointer * removed unused EXPORTS * MAXVALUE redeclared as LONG_MAX * beancounter_findcreate clarification * renamed UBC -> BC, ub -> bc etc. * moved BC inheritance into copy_process * introduced reset_exec_bc() with proposed BUG_ON * removed task_bc beancounter (not used yet, for numproc) * fixed syscalls for sparc * added sys_get_bcstat(): return info that was in /proc * cond_syscall instead of #ifdefs
Many thanks to Oleg Nesterov, Alan Cox, Matt Helsley and others for patch review and comments.
Patch set is applicable to 2.6.18-rc5-mm1
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