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Paul Menage cc31edceee cgroups: convert tasks file to use a seq_file with shared pid array 
Rather than pre-generating the entire text for the "tasks" file each
time the file is opened, we instead just generate/update the array of
process ids and use a seq_file to report these to userspace.  All open
file handles on the same "tasks" file can share a pid array, which may
be updated any time that no thread is actively reading the array.  By
sharing the array, the potential for userspace to DoS the system by
opening many handles on the same "tasks" file is removed.

[Based on a patch by Lai Jiangshan, extended to use seq_file]

Signed-off-by: Paul Menage <menage@google.com>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20 08:52:38 -07:00
..
irq Merge branch 'linus' into x86/core 2008-08-14 14:58:01 +02:00
power container freezer: skip frozen cgroups during power management resume 2008-10-20 08:52:34 -07:00
time Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
trace hrtimer: prevent migration of per CPU hrtimers 2008-09-29 17:09:14 +02:00
.gitignore
acct.c tty: Fix abusers of current->sighand->tty 2008-10-13 09:51:42 -07:00
audit.c [PATCH] Fix the bug of using AUDIT_STATUS_RATE_LIMIT when set fail, no error output. 2008-08-01 12:15:16 -04:00
audit.h
audit_tree.c
auditfilter.c Re: [PATCH] the loginuid field should be output in all AUDIT_CONFIG_CHANGE audit messages 2008-08-01 12:15:03 -04:00
auditsc.c tty: Fix abusers of current->sighand->tty 2008-10-13 09:51:42 -07:00
backtracetest.c backtrace: replace timer with tasklet + completions 2008-06-27 18:09:16 +02:00
bounds.c
capability.c security: Fix setting of PF_SUPERPRIV by __capable() 2008-08-14 22:59:43 +10:00
cgroup.c cgroups: convert tasks file to use a seq_file with shared pid array 2008-10-20 08:52:38 -07:00
cgroup_debug.c cgroups: fix probable race with put_css_set[_taskexit] and find_css_set 2008-10-20 08:52:38 -07:00
cgroup_freezer.c container freezer: rename check_if_frozen() 2008-10-20 08:52:34 -07:00
compat.c compat: generic compat get/settimeofday 2008-10-16 11:21:33 -07:00
configs.c kernel/configs.c: remove useless comments 2008-10-20 08:52:34 -07:00
cpu.c Merge branches 'sched/devel', 'sched/cpu-hotplug', 'sched/cpusets' and 'sched/urgent' into sched/core 2008-10-08 11:31:02 +02:00
cpuset.c cpusets: scan_for_empty_cpusets(), cpuset doesn't seem to be so const 2008-10-03 13:39:50 +02:00
delayacct.c per-task-delay-accounting: update taskstats for memory reclaim delay 2008-07-25 10:53:47 -07:00
dma-coherent.c dma-coherent: export dma_[alloc|release]_from_coherent methods 2008-08-22 08:34:53 +02:00
dma.c kernel/dma.c: remove a CVS keyword 2008-10-16 11:21:30 -07:00
exec_domain.c [PATCH] kill altroot 2008-07-26 20:53:20 -04:00
exit.c memrlimit: cgroup mm owner callback changes to add task info 2008-10-16 11:21:28 -07:00
extable.c
fork.c tty: Add a kref count 2008-10-13 09:51:40 -07:00
freezer.c container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
futex.c
futex_compat.c
hrtimer.c hrtimer: prevent migration of per CPU hrtimers 2008-09-29 17:09:14 +02:00
itimer.c
kallsyms.c kernel/kallsyms.c: fix double return 2008-10-16 11:21:32 -07:00
Kconfig.freezer container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
Kconfig.hz sched: fix SCHED_HRTICK dependency 2008-07-28 14:37:38 +02:00
Kconfig.preempt
kexec.c kexec: fix segmentation fault in kimage_add_entry 2008-09-23 08:09:14 -07:00
kfifo.c
kgdb.c kgdb: call touch_softlockup_watchdog on resume 2008-10-06 13:50:59 -05:00
kmod.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2008-10-16 12:38:34 -07:00
kprobes.c make kprobes.c:kretprobe_table_lock() static 2008-10-16 11:21:52 -07:00
ksysfs.c profiling: dynamically enable readprofile at runtime 2008-10-16 11:21:31 -07:00
kthread.c tracehook: wait_task_inactive 2008-07-26 12:00:09 -07:00
latencytop.c
lockdep.c lockdep: fix invalid list_del_rcu in zap_class 2008-08-27 08:40:36 +02:00
lockdep_internals.h lockdep: build fix 2008-08-13 12:55:10 +02:00
lockdep_proc.c lockstat: fix numerical output rounding error 2008-08-26 10:37:46 +02:00
Makefile container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
marker.c markers: fix markers read barrier for multiple probes 2008-07-30 09:41:45 -07:00
module.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6 2008-10-17 09:50:12 -07:00
mutex-debug.c
mutex-debug.h
mutex.c locking: fix mutex @key parameter kernel-doc notation 2008-07-28 18:12:36 +02:00
mutex.h
notifier.c
ns_cgroup.c cgroup_clone: use pid of newly created task for new cgroup 2008-07-25 10:53:37 -07:00
nsproxy.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
panic.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6 2008-10-17 09:50:12 -07:00
params.c
pid.c pidns: remove now unused find_pid function. 2008-07-25 10:53:45 -07:00
pid_namespace.c pid_ns: (BUG 11391) change ->child_reaper when init->group_leader exits 2008-09-02 19:21:38 -07:00
pm_qos_params.c pm_qos_requirement might sleep 2008-09-02 19:21:40 -07:00
posix-cpu-timers.c
posix-timers.c fix error-path NULL deref in alloc_posix_timer() 2008-10-02 15:53:13 -07:00
printk.c Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
profile.c profiling: dynamically enable readprofile at runtime 2008-10-16 11:21:31 -07:00
ptrace.c security: Fix setting of PF_SUPERPRIV by __capable() 2008-08-14 22:59:43 +10:00
rcuclassic.c rcu: RCU-based detection of stalled CPUs for Classic RCU, fix 2008-10-03 10:41:00 +02:00
rcupdate.c rcu: fix synchronize_rcu() so that kernel-doc works 2008-08-21 09:31:44 +02:00
rcupreempt.c rcu: remove redundant ACCESS_ONCE definition from rcupreempt.c 2008-08-18 09:45:22 +02:00
rcupreempt_trace.c rcu: trace fix possible mem-leak 2008-08-15 17:54:40 +02:00
rcutorture.c
relay.c relay: fix "full buffer with exactly full last subbuffer" accounting problem 2008-08-05 14:33:46 -07:00
res_counter.c cgroup files: convert res_counter_write() to be a cgroups write_string() handler 2008-07-25 10:53:36 -07:00
resource.c Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
sched.c sched debug: add name to sched_domain sysctl entries 2008-10-09 17:13:06 +02:00
sched_clock.c sched_clock: prevent scd->clock from moving backwards 2008-10-10 11:17:04 +02:00
sched_cpupri.c
sched_cpupri.h
sched_debug.c [PATCH] signal, procfs: some lock_task_sighand() users do not need rcu_read_lock() 2008-10-10 04:18:57 +04:00
sched_fair.c sched: sync wakeups vs avg_overlap 2008-10-08 12:20:26 +02:00
sched_features.h sched: turn off WAKEUP_OVERLAP 2008-09-22 16:29:00 +02:00
sched_idletask.c sched: wakeup preempt when small overlap 2008-09-22 16:28:32 +02:00
sched_rt.c sched_rt.c: resch needed in rt_rq_enqueue() for the root rt_rq 2008-10-04 14:31:54 +02:00
sched_stats.h sched: fix accounting in task delay accounting & migration 2008-07-04 12:50:23 +02:00
seccomp.c
semaphore.c semaphore: __down_common: use signal_pending_state() 2008-08-05 14:33:47 -07:00
signal.c tracehook: fix SA_NOCLDWAIT 2008-08-19 20:37:07 -07:00
smp.c smp: have smp_call_function_single() detect invalid CPUs 2008-08-25 17:45:48 -07:00
softirq.c softirq: Add support for triggering softirq work on softirqs. 2008-10-17 08:46:56 +02:00
softlockup.c Make the taint flags reliable 2008-10-16 11:21:31 -07:00
spinlock.c lockdep: spin_lock_nest_lock(), checkpatch fixes 2008-08-13 13:56:51 +02:00
srcu.c
stacktrace.c stacktrace: fix modular build, export print_stack_trace and save_stack_trace 2008-06-30 09:20:55 +02:00
stop_machine.c stop_machine: remove unused variable 2008-08-12 17:52:55 +10:00
sys.c kernel/sys.c: improve code generation 2008-10-16 11:21:31 -07:00
sys_ni.c Configure out AIO support 2008-10-16 11:21:51 -07:00
sysctl.c vmscan: unevictable LRU scan sysctl 2008-10-20 08:52:31 -07:00
sysctl_check.c sysctl: check for bogus modes 2008-07-25 10:53:45 -07:00
taskstats.c taskstats: remove initialization of static per-cpu variable 2008-07-25 10:53:47 -07:00
test_kprobes.c
time.c
timeconst.pl
timer.c printk: robustify printk 2008-08-11 13:46:53 +02:00
tsacct.c task IO accounting: move all IO statistics in struct task_io_accounting 2008-07-27 16:12:28 -07:00
uid16.c
user.c sched: rt-bandwidth for user grouping interface 2008-08-19 13:10:09 +02:00
user_namespace.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
utsname.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
utsname_sysctl.c sysctl: simplify ->strategy 2008-10-16 11:21:47 -07:00
wait.c wait: kill is_sync_wait() 2008-10-16 11:21:31 -07:00
workqueue.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00