Gathered Ideas - Linux-VServer

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Open VZ Inspirations

Don't allow kernel_thread() inside a context
virtual ptmx masters/pty limits?
make vx_info reference less (just a task_info->ptr)
dentry/dcache accounting
barrier/limit(hard)/(max/min)-held per period/failcnt
switch to/from xid=0 on timer_notify_task(), printk(), *softirq(),

netpoll_rx(), netdev_run_todo(), neigh_timer_handler(),

neigh_proxy_process(), rtnetlink_rcv(), ip_expire(), ipq_rcv_sk(),

tcp_write_timeout(), tcp_*_timer(), tcp_set_keepalive(),

qdisc_restart(), svc_*(), xprt_*(), pty_*(), get_tgid_list()

Open VZ Resource Params

Param	Description
barrier	A barrier over which resource allocations are failed gracefully. sbrk/mmap fails
limit	hard resource limit
held	consumed resources
maxheld	maximum amount of consumed resources through the last period
minheld	minimum amount of consumed resources through the last period
failcnt	count of failed charges

Open VZ Resource Limits

Limit		Description
0	UB_KMEMSIZE	Unswappable kernel memory size including struct task, page directories, etc.
1	UB_LOCKEDPAGES	Mlock()ed pages
2	UB_PRIVVMPAGES	Total number of pages, counting potentially private pages as private and used.
3	UB_SHMPAGES	IPC SHM segment size
4	UB_ZSHMPAGES	Anonymous shared memory.
5	UB_NUMPROC	Number of processes.
6	UB_PHYSPAGES	All resident pages, for swapout guarantee.
7	UB_VMGUARPAGES	Guarantee for memory allocation, checked against PRIVVMPAGES.
8	UB_OOMGUARPAGES	Guarantees against OOM kill. Only limit is used, no accounting.
9	UB_NUMTCPSOCK	Number of TCP sockets.
10	UB_NUMFLOCK	Number of file locks.
11	UB_NUMPTY	Number of PTYs.
12	UB_NUMSIGINFO	Number of siginfos.
13	UB_TCPSNDBUF	Total size of tcp send buffers.
14	UB_TCPRCVBUF	Total size of tcp receive buffers.
15	UB_OTHERSOCKBUF	Total size of other socket send buffers (all buffers for PF_UNIX)
16	UB_DGRAMRCVBUF	Total size of other socket receive buffers.
17	UB_NUMOTHERSOCK	Number of other sockets.
18	UB_DCACHESIZE	Size of busy dentry/inode cache.
19	UB_NUMFILE	Number of open files.
Limit
24	UB_RESOURCES
+0	UB_UNUSEDPRIVVM
+1	UB_TMPFSPAGES
+2	UB_SWAPPAGES
+3	UB_HELDPAGES

(taken from 2.6.8-022stab032, which, according to SWsoft is GPL now)