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Date: Thu, 2 Dec 2010 10:16:58 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Mike Galbraith <efault@....de>
Cc: Valdis.Kletnieks@...edu, akpm@...ux-foundation.org,
Ingo Molnar <mingo@...e.hu>, mm-commits@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: mmotm 2010-11-23 + autogroups -> inconsistent lock state
On Wed, Nov 24, 2010 at 01:25:25PM -0700, Mike Galbraith wrote:
> On Wed, 2010-11-24 at 00:01 -0500, Valdis.Kletnieks@...edu wrote:
> > On Tue, 23 Nov 2010 16:13:06 PST, akpm@...ux-foundation.org said:
> > > The mm-of-the-moment snapshot 2010-11-23-16-12 has been uploaded to
> > >
> > > http://userweb.kernel.org/~akpm/mmotm/
> >
> > (I appear to be on a roll tonight - 3 splats before I even had a chance to login. :)
> >
> > mmotm + Ingo's cleanup of Mike's autogroups patch.
> ...
>
> Sorry for slow response, been trying to use some of my last few vacation
> days on vacation stuff ;-)
>
> The below should run gripe free. Suppose I should learn to turn on
> lockdep and whatnot when tinkering/testing.
>
> Unfortunately, tip's update_shares() changes are still being difficult.
>
> static void update_shares(int cpu)
> {
> struct cfs_rq *cfs_rq;
> struct rq *rq = cpu_rq(cpu);
>
> rcu_read_lock();
> for_each_leaf_cfs_rq(rq, cfs_rq)
> update_shares_cpu(cfs_rq->tg, cpu);
> rcu_read_unlock();
> }
>
> Despite task groups being freed via rcu, update_shares_cup() hits freed
> memory and explodes, and nothing I've tried has been able to stop it.
> The only thing I haven't tried (aside from the right thing;) is to take
> rcu out of the picture entirely.
Is your new autogroup structure retaining a pointer to memory that
is freed by RCU?
If so, you will need to NULL out that pointer before the memory
in question is passed to call_rcu(). (Or before the call to
synchronize_rcu(), as the case may be.)
Thanx, Paul
> From: Mike Galbraith <efault@....de>
> Date: Sat, 20 Nov 2010 12:35:00 -0700
> Subject: [PATCH] sched: Improve desktop interactivity: Implement automated per session task groups
>
> A recurring complaint from CFS users is that parallel kbuild has a negative
> impact on desktop interactivity. This patch implements an idea from Linus,
> to automatically create task groups. Currently, only per session autogroups
> are implemented, but the patch leaves the way open for enhancement.
>
> Implementation: each task's signal struct contains an inherited pointer to
> a refcounted autogroup struct containing a task group pointer, the default
> for all tasks pointing to the init_task_group. When a task calls setsid(),
> a new task group is created, the process is moved into the new task group,
> and a reference to the preveious task group is dropped. Child processes
> inherit this task group thereafter, and increase it's refcount. When the
> last thread of a process exits, the process's reference is dropped, such
> that when the last process referencing an autogroup exits, the autogroup
> is destroyed.
>
> At runqueue selection time, IFF a task has no cgroup assignment, its current
> autogroup is used.
>
> Autogroup bandwidth is controllable via setting it's nice level through the
> proc filesystem. cat /proc/<pid>/autogroup displays the task's group and the
> group's nice level. echo <nice level> > /proc/<pid>/autogroup Sets the task
> group's shares to the weight of nice <level> task. Setting nice level is rate
> limited for !admin users due to the abuse risk of task group locking.
>
> The feature is enabled from boot by default if CONFIG_SCHED_AUTOGROUP=y is
> selected, but can be disabled via the boot option noautogroup, and can also
> be turned on/off on the fly via..
> echo [01] > /proc/sys/kernel/sched_autogroup_enabled.
> ..which will automatically move tasks to/from the root task group.
>
> Signed-off-by: Mike Galbraith <efault@....de>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Markus Trippelsdorf <markus@...ppelsdorf.de>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> LKML-Reference: <1290281700.28711.9.camel@...gy.simson.net>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
> Documentation/kernel-parameters.txt | 2
> fs/proc/base.c | 79 +++++++++++
> include/linux/sched.h | 23 +++
> init/Kconfig | 12 +
> kernel/fork.c | 5
> kernel/sched.c | 13 +
> kernel/sched_autogroup.c | 240 ++++++++++++++++++++++++++++++++++++
> kernel/sched_autogroup.h | 23 +++
> kernel/sched_debug.c | 29 ++--
> kernel/sys.c | 4
> kernel/sysctl.c | 11 +
> 11 files changed, 423 insertions(+), 18 deletions(-)
>
> Index: linux-2.6.37.git/include/linux/sched.h
> ===================================================================
> --- linux-2.6.37.git.orig/include/linux/sched.h
> +++ linux-2.6.37.git/include/linux/sched.h
> @@ -509,6 +509,8 @@ struct thread_group_cputimer {
> spinlock_t lock;
> };
>
> +struct autogroup;
> +
> /*
> * NOTE! "signal_struct" does not have it's own
> * locking, because a shared signal_struct always
> @@ -576,6 +578,9 @@ struct signal_struct {
>
> struct tty_struct *tty; /* NULL if no tty */
>
> +#ifdef CONFIG_SCHED_AUTOGROUP
> + struct autogroup *autogroup;
> +#endif
> /*
> * Cumulative resource counters for dead threads in the group,
> * and for reaped dead child processes forked by this group.
> @@ -1931,6 +1936,24 @@ int sched_rt_handler(struct ctl_table *t
>
> extern unsigned int sysctl_sched_compat_yield;
>
> +#ifdef CONFIG_SCHED_AUTOGROUP
> +extern unsigned int sysctl_sched_autogroup_enabled;
> +
> +extern void sched_autogroup_create_attach(struct task_struct *p);
> +extern void sched_autogroup_detach(struct task_struct *p);
> +extern void sched_autogroup_fork(struct signal_struct *sig);
> +extern void sched_autogroup_exit(struct signal_struct *sig);
> +#ifdef CONFIG_PROC_FS
> +extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
> +extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice);
> +#endif
> +#else
> +static inline void sched_autogroup_create_attach(struct task_struct *p) { }
> +static inline void sched_autogroup_detach(struct task_struct *p) { }
> +static inline void sched_autogroup_fork(struct signal_struct *sig) { }
> +static inline void sched_autogroup_exit(struct signal_struct *sig) { }
> +#endif
> +
> #ifdef CONFIG_RT_MUTEXES
> extern int rt_mutex_getprio(struct task_struct *p);
> extern void rt_mutex_setprio(struct task_struct *p, int prio);
> Index: linux-2.6.37.git/kernel/sched.c
> ===================================================================
> --- linux-2.6.37.git.orig/kernel/sched.c
> +++ linux-2.6.37.git/kernel/sched.c
> @@ -78,6 +78,7 @@
>
> #include "sched_cpupri.h"
> #include "workqueue_sched.h"
> +#include "sched_autogroup.h"
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/sched.h>
> @@ -268,6 +269,10 @@ struct task_group {
> struct task_group *parent;
> struct list_head siblings;
> struct list_head children;
> +
> +#ifdef CONFIG_SCHED_AUTOGROUP
> + struct autogroup *autogroup;
> +#endif
> };
>
> #define root_task_group init_task_group
> @@ -605,11 +610,14 @@ static inline int cpu_of(struct rq *rq)
> */
> static inline struct task_group *task_group(struct task_struct *p)
> {
> + struct task_group *tg;
> struct cgroup_subsys_state *css;
>
> css = task_subsys_state_check(p, cpu_cgroup_subsys_id,
> lockdep_is_held(&task_rq(p)->lock));
> - return container_of(css, struct task_group, css);
> + tg = container_of(css, struct task_group, css);
> +
> + return autogroup_task_group(p, tg);
> }
>
> /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
> @@ -2006,6 +2014,7 @@ static void sched_irq_time_avg_update(st
> #include "sched_idletask.c"
> #include "sched_fair.c"
> #include "sched_rt.c"
> +#include "sched_autogroup.c"
> #include "sched_stoptask.c"
> #ifdef CONFIG_SCHED_DEBUG
> # include "sched_debug.c"
> @@ -7979,7 +7988,7 @@ void __init sched_init(void)
> #ifdef CONFIG_CGROUP_SCHED
> list_add(&init_task_group.list, &task_groups);
> INIT_LIST_HEAD(&init_task_group.children);
> -
> + autogroup_init(&init_task);
> #endif /* CONFIG_CGROUP_SCHED */
>
> #if defined CONFIG_FAIR_GROUP_SCHED && defined CONFIG_SMP
> Index: linux-2.6.37.git/kernel/fork.c
> ===================================================================
> --- linux-2.6.37.git.orig/kernel/fork.c
> +++ linux-2.6.37.git/kernel/fork.c
> @@ -174,8 +174,10 @@ static inline void free_signal_struct(st
>
> static inline void put_signal_struct(struct signal_struct *sig)
> {
> - if (atomic_dec_and_test(&sig->sigcnt))
> + if (atomic_dec_and_test(&sig->sigcnt)) {
> + sched_autogroup_exit(sig);
> free_signal_struct(sig);
> + }
> }
>
> void __put_task_struct(struct task_struct *tsk)
> @@ -904,6 +906,7 @@ static int copy_signal(unsigned long clo
> posix_cpu_timers_init_group(sig);
>
> tty_audit_fork(sig);
> + sched_autogroup_fork(sig);
>
> sig->oom_adj = current->signal->oom_adj;
> sig->oom_score_adj = current->signal->oom_score_adj;
> Index: linux-2.6.37.git/kernel/sys.c
> ===================================================================
> --- linux-2.6.37.git.orig/kernel/sys.c
> +++ linux-2.6.37.git/kernel/sys.c
> @@ -1080,8 +1080,10 @@ SYSCALL_DEFINE0(setsid)
> err = session;
> out:
> write_unlock_irq(&tasklist_lock);
> - if (err > 0)
> + if (err > 0) {
> proc_sid_connector(group_leader);
> + sched_autogroup_create_attach(group_leader);
> + }
> return err;
> }
>
> Index: linux-2.6.37.git/kernel/sched_debug.c
> ===================================================================
> --- linux-2.6.37.git.orig/kernel/sched_debug.c
> +++ linux-2.6.37.git/kernel/sched_debug.c
> @@ -87,6 +87,20 @@ static void print_cfs_group_stats(struct
> }
> #endif
>
> +#if defined(CONFIG_CGROUP_SCHED) && \
> + (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
> +static void task_group_path(struct task_group *tg, char *buf, int buflen)
> +{
> + /* may be NULL if the underlying cgroup isn't fully-created yet */
> + if (!tg->css.cgroup) {
> + if (!autogroup_path(tg, buf, buflen))
> + buf[0] = '\0';
> + return;
> + }
> + cgroup_path(tg->css.cgroup, buf, buflen);
> +}
> +#endif
> +
> static void
> print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
> {
> @@ -115,7 +129,7 @@ print_task(struct seq_file *m, struct rq
> char path[64];
>
> rcu_read_lock();
> - cgroup_path(task_group(p)->css.cgroup, path, sizeof(path));
> + task_group_path(task_group(p), path, sizeof(path));
> rcu_read_unlock();
> SEQ_printf(m, " %s", path);
> }
> @@ -147,19 +161,6 @@ static void print_rq(struct seq_file *m,
> read_unlock_irqrestore(&tasklist_lock, flags);
> }
>
> -#if defined(CONFIG_CGROUP_SCHED) && \
> - (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
> -static void task_group_path(struct task_group *tg, char *buf, int buflen)
> -{
> - /* may be NULL if the underlying cgroup isn't fully-created yet */
> - if (!tg->css.cgroup) {
> - buf[0] = '\0';
> - return;
> - }
> - cgroup_path(tg->css.cgroup, buf, buflen);
> -}
> -#endif
> -
> void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
> {
> s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
> Index: linux-2.6.37.git/fs/proc/base.c
> ===================================================================
> --- linux-2.6.37.git.orig/fs/proc/base.c
> +++ linux-2.6.37.git/fs/proc/base.c
> @@ -1407,6 +1407,82 @@ static const struct file_operations proc
>
> #endif
>
> +#ifdef CONFIG_SCHED_AUTOGROUP
> +/*
> + * Print out autogroup related information:
> + */
> +static int sched_autogroup_show(struct seq_file *m, void *v)
> +{
> + struct inode *inode = m->private;
> + struct task_struct *p;
> +
> + p = get_proc_task(inode);
> + if (!p)
> + return -ESRCH;
> + proc_sched_autogroup_show_task(p, m);
> +
> + put_task_struct(p);
> +
> + return 0;
> +}
> +
> +static ssize_t
> +sched_autogroup_write(struct file *file, const char __user *buf,
> + size_t count, loff_t *offset)
> +{
> + struct inode *inode = file->f_path.dentry->d_inode;
> + struct task_struct *p;
> + char buffer[PROC_NUMBUF];
> + long nice;
> + int err;
> +
> + memset(buffer, 0, sizeof(buffer));
> + if (count > sizeof(buffer) - 1)
> + count = sizeof(buffer) - 1;
> + if (copy_from_user(buffer, buf, count))
> + return -EFAULT;
> +
> + err = strict_strtol(strstrip(buffer), 0, &nice);
> + if (err)
> + return -EINVAL;
> +
> + p = get_proc_task(inode);
> + if (!p)
> + return -ESRCH;
> +
> + err = nice;
> + err = proc_sched_autogroup_set_nice(p, &err);
> + if (err)
> + count = err;
> +
> + put_task_struct(p);
> +
> + return count;
> +}
> +
> +static int sched_autogroup_open(struct inode *inode, struct file *filp)
> +{
> + int ret;
> +
> + ret = single_open(filp, sched_autogroup_show, NULL);
> + if (!ret) {
> + struct seq_file *m = filp->private_data;
> +
> + m->private = inode;
> + }
> + return ret;
> +}
> +
> +static const struct file_operations proc_pid_sched_autogroup_operations = {
> + .open = sched_autogroup_open,
> + .read = seq_read,
> + .write = sched_autogroup_write,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +#endif /* CONFIG_SCHED_AUTOGROUP */
> +
> static ssize_t comm_write(struct file *file, const char __user *buf,
> size_t count, loff_t *offset)
> {
> @@ -2733,6 +2809,9 @@ static const struct pid_entry tgid_base_
> #ifdef CONFIG_SCHED_DEBUG
> REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
> #endif
> +#ifdef CONFIG_SCHED_AUTOGROUP
> + REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
> +#endif
> REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
> #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
> INF("syscall", S_IRUSR, proc_pid_syscall),
> Index: linux-2.6.37.git/kernel/sched_autogroup.h
> ===================================================================
> --- /dev/null
> +++ linux-2.6.37.git/kernel/sched_autogroup.h
> @@ -0,0 +1,23 @@
> +#ifdef CONFIG_SCHED_AUTOGROUP
> +
> +static inline struct task_group *
> +autogroup_task_group(struct task_struct *p, struct task_group *tg);
> +
> +#else /* !CONFIG_SCHED_AUTOGROUP */
> +
> +static inline void autogroup_init(struct task_struct *init_task) { }
> +
> +static inline struct task_group *
> +autogroup_task_group(struct task_struct *p, struct task_group *tg)
> +{
> + return tg;
> +}
> +
> +#ifdef CONFIG_SCHED_DEBUG
> +static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
> +{
> + return 0;
> +}
> +#endif
> +
> +#endif /* CONFIG_SCHED_AUTOGROUP */
> Index: linux-2.6.37.git/kernel/sched_autogroup.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6.37.git/kernel/sched_autogroup.c
> @@ -0,0 +1,240 @@
> +#ifdef CONFIG_SCHED_AUTOGROUP
> +
> +#include <linux/proc_fs.h>
> +#include <linux/seq_file.h>
> +#include <linux/kallsyms.h>
> +#include <linux/utsname.h>
> +
> +unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
> +
> +struct autogroup {
> + struct kref kref;
> + struct task_group *tg;
> + struct rw_semaphore lock;
> + unsigned long id;
> + int nice;
> +};
> +
> +static struct autogroup autogroup_default;
> +static atomic_t autogroup_seq_nr;
> +
> +static void autogroup_init(struct task_struct *init_task)
> +{
> + autogroup_default.tg = &init_task_group;
> + init_task_group.autogroup = &autogroup_default;
> + kref_init(&autogroup_default.kref);
> + init_rwsem(&autogroup_default.lock);
> + init_task->signal->autogroup = &autogroup_default;
> +}
> +
> +static inline void autogroup_free(struct task_group *tg)
> +{
> + kfree(tg->autogroup);
> +}
> +
> +static inline void autogroup_destroy(struct kref *kref)
> +{
> + struct autogroup *ag = container_of(kref, struct autogroup, kref);
> +
> + sched_destroy_group(ag->tg);
> +}
> +
> +static inline void autogroup_kref_put(struct autogroup *ag)
> +{
> + kref_put(&ag->kref, autogroup_destroy);
> +}
> +
> +static inline struct autogroup *autogroup_kref_get(struct autogroup *ag)
> +{
> + kref_get(&ag->kref);
> + return ag;
> +}
> +
> +static inline struct autogroup *autogroup_create(void)
> +{
> + struct autogroup *ag = kzalloc(sizeof(*ag), GFP_KERNEL);
> + struct task_group *tg;
> +
> + if (!ag)
> + goto out_fail;
> +
> + tg = sched_create_group(&init_task_group);
> +
> + if (IS_ERR(tg))
> + goto out_free;
> +
> + kref_init(&ag->kref);
> + init_rwsem(&ag->lock);
> + ag->id = atomic_inc_return(&autogroup_seq_nr);
> + ag->tg = tg;
> + tg->autogroup = ag;
> +
> + return ag;
> +
> +out_free:
> + kfree(ag);
> +out_fail:
> + if (printk_ratelimit())
> + printk(KERN_WARNING "autogroup_create: %s failure.\n",
> + ag ? "sched_create_group()" : "kmalloc()");
> +
> + return autogroup_kref_get(&autogroup_default);
> +}
> +
> +static inline bool
> +task_wants_autogroup(struct task_struct *p, struct task_group *tg)
> +{
> + if (tg != &root_task_group)
> + return false;
> +
> + if (p->sched_class != &fair_sched_class)
> + return false;
> +
> + /*
> + * We can only assume the task group can't go away on us if
> + * autogroup_move_group() can see us on ->thread_group list.
> + */
> + if (p->flags & PF_EXITING)
> + return false;
> +
> + return true;
> +}
> +
> +static inline struct task_group *
> +autogroup_task_group(struct task_struct *p, struct task_group *tg)
> +{
> + int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
> +
> + if (enabled && task_wants_autogroup(p, tg))
> + return p->signal->autogroup->tg;
> +
> + return tg;
> +}
> +
> +static void
> +autogroup_move_group(struct task_struct *p, struct autogroup *ag)
> +{
> + struct autogroup *prev;
> + struct task_struct *t;
> + unsigned long flags;
> +
> + if (!lock_task_sighand(p, &flags)) {
> + WARN_ON(1);
> + return;
> + }
> +
> + prev = p->signal->autogroup;
> + if (prev == ag) {
> + unlock_task_sighand(p, &flags);
> + return;
> + }
> +
> + p->signal->autogroup = autogroup_kref_get(ag);
> + t = p;
> +
> + do {
> + sched_move_task(t);
> + } while_each_thread(p, t);
> +
> + unlock_task_sighand(p, &flags);
> + autogroup_kref_put(prev);
> +}
> +
> +/* Allocates GFP_KERNEL, cannot be called under any spinlock */
> +void sched_autogroup_create_attach(struct task_struct *p)
> +{
> + struct autogroup *ag = autogroup_create();
> +
> + autogroup_move_group(p, ag);
> + /* drop extra refrence added by autogroup_create() */
> + autogroup_kref_put(ag);
> +}
> +EXPORT_SYMBOL(sched_autogroup_create_attach);
> +
> +/* Cannot be called under siglock. Currently has no users */
> +void sched_autogroup_detach(struct task_struct *p)
> +{
> + autogroup_move_group(p, &autogroup_default);
> +}
> +EXPORT_SYMBOL(sched_autogroup_detach);
> +
> +void sched_autogroup_fork(struct signal_struct *sig)
> +{
> + struct task_struct *p = current;
> +
> + spin_lock_irq(&p->sighand->siglock);
> + sig->autogroup = autogroup_kref_get(p->signal->autogroup);
> + spin_unlock_irq(&p->sighand->siglock);
> +}
> +
> +void sched_autogroup_exit(struct signal_struct *sig)
> +{
> + autogroup_kref_put(sig->autogroup);
> +}
> +
> +static int __init setup_autogroup(char *str)
> +{
> + sysctl_sched_autogroup_enabled = 0;
> +
> + return 1;
> +}
> +
> +__setup("noautogroup", setup_autogroup);
> +
> +#ifdef CONFIG_PROC_FS
> +
> +/* Called with siglock held. */
> +int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice)
> +{
> + static unsigned long next = INITIAL_JIFFIES;
> + struct autogroup *ag;
> + int err;
> +
> + if (*nice < -20 || *nice > 19)
> + return -EINVAL;
> +
> + err = security_task_setnice(current, *nice);
> + if (err)
> + return err;
> +
> + if (*nice < 0 && !can_nice(current, *nice))
> + return -EPERM;
> +
> + /* this is a heavy operation taking global locks.. */
> + if (!capable(CAP_SYS_ADMIN) && time_before(jiffies, next))
> + return -EAGAIN;
> +
> + next = HZ / 10 + jiffies;
> + ag = autogroup_kref_get(p->signal->autogroup);
> +
> + down_write(&ag->lock);
> + err = sched_group_set_shares(ag->tg, prio_to_weight[*nice + 20]);
> + if (!err)
> + ag->nice = *nice;
> + up_write(&ag->lock);
> +
> + autogroup_kref_put(ag);
> +
> + return err;
> +}
> +
> +void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m)
> +{
> + struct autogroup *ag = autogroup_kref_get(p->signal->autogroup);
> +
> + down_read(&ag->lock);
> + seq_printf(m, "/autogroup-%ld nice %d\n", ag->id, ag->nice);
> + up_read(&ag->lock);
> +
> + autogroup_kref_put(ag);
> +}
> +#endif /* CONFIG_PROC_FS */
> +
> +#ifdef CONFIG_SCHED_DEBUG
> +static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
> +{
> + return snprintf(buf, buflen, "%s-%ld", "/autogroup", tg->autogroup->id);
> +}
> +#endif /* CONFIG_SCHED_DEBUG */
> +
> +#endif /* CONFIG_SCHED_AUTOGROUP */
> Index: linux-2.6.37.git/kernel/sysctl.c
> ===================================================================
> --- linux-2.6.37.git.orig/kernel/sysctl.c
> +++ linux-2.6.37.git/kernel/sysctl.c
> @@ -382,6 +382,17 @@ static struct ctl_table kern_table[] = {
> .mode = 0644,
> .proc_handler = proc_dointvec,
> },
> +#ifdef CONFIG_SCHED_AUTOGROUP
> + {
> + .procname = "sched_autogroup_enabled",
> + .data = &sysctl_sched_autogroup_enabled,
> + .maxlen = sizeof(unsigned int),
> + .mode = 0644,
> + .proc_handler = proc_dointvec,
> + .extra1 = &zero,
> + .extra2 = &one,
> + },
> +#endif
> #ifdef CONFIG_PROVE_LOCKING
> {
> .procname = "prove_locking",
> Index: linux-2.6.37.git/init/Kconfig
> ===================================================================
> --- linux-2.6.37.git.orig/init/Kconfig
> +++ linux-2.6.37.git/init/Kconfig
> @@ -728,6 +728,18 @@ config NET_NS
>
> endif # NAMESPACES
>
> +config SCHED_AUTOGROUP
> + bool "Automatic process group scheduling"
> + select CGROUPS
> + select CGROUP_SCHED
> + select FAIR_GROUP_SCHED
> + help
> + This option optimizes the scheduler for common desktop workloads by
> + automatically creating and populating task groups. This separation
> + of workloads isolates aggressive CPU burners (like build jobs) from
> + desktop applications. Task group autogeneration is currently based
> + upon task session.
> +
> config MM_OWNER
> bool
>
> Index: linux-2.6.37.git/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.37.git.orig/Documentation/kernel-parameters.txt
> +++ linux-2.6.37.git/Documentation/kernel-parameters.txt
> @@ -1622,6 +1622,8 @@ and is between 256 and 4096 characters.
> noapic [SMP,APIC] Tells the kernel to not make use of any
> IOAPICs that may be present in the system.
>
> + noautogroup Disable scheduler automatic task group creation.
> +
> nobats [PPC] Do not use BATs for mapping kernel lowmem
> on "Classic" PPC cores.
>
>
>
>
>
> --
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