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SubjectRe: [ckrm-tech] V2: Add tgid aggregation to beancounters (was Re: [PATCH] BC: resource beancounters (v4) (added user memory))
Balbir,

I'm sorry for being unreachable for some time.
I will definetely check this patch when come back.

Thanks for colloboration! :)

Kirill

> Balbir Singh wrote:
>
>>On Wed, Sep 06, 2006 at 05:06:44PM +0400, Kirill Korotaev wrote:
>>
>>>Balbir Singh wrote:
>>>
>>>>Kirill Korotaev wrote:
>>>>
>>>>
>>>>>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.
>>>>
>>>>One of the key requirements of resource management for us is to be able to
>>>>migrate tasks across resource groups. Since bean counters do not associate
>>>>a list of tasks associated with them, I do not see how this can be done
>>>>with the existing bean counters.
>>>
>>>It was discussed multiple times already.
>>>The key problem here is the objects which do not _belong_ to tasks.
>>>e.g. IPC objects. They exist in global namespace and can't be reaccounted.
>>>At least no one proposed the policy to reaccount.
>>>And please note, IPCs are not the only such objects.
>>>
>>>But I guess your comment mostly concerns user pages, yeah?
>>>In this case reaccounting can be easily done using page beancounters
>>>which are introduced in this patch set.
>>>So if it is a requirement, then lets cooperate and create such functionality.
>>>
>>>So for now I see 2 main requirements from people:
>>>- memory reclamation
>>>- tasks moving across beancounters
>>>
>>>I agree with these requirements and lets move into this direction.
>>>But moving so far can't be done without accepting:
>>>1. core functionality
>>>2. accounting
>>>
>>>Thanks,
>>>Kirill
>>
>>Hi, Kirill,
>>
>>I've got a patch to extend bean-counters to do simple aggregation.
>>
>>The idea is to use this to finally do task migration. Initial comments on the
>>design and idea would be useful. The original idea was suggested by Dave
>>Hansen during a private discussion.
>>
>>TODOS:
>>
>>1. Add task data extraction support
>>2. Add task migration support
>>
>>I've gotten the patch to compile and boot on a x86-64 box.
>>
>
>
>
> Attempt to create per-tgid beancounters. These are especially useful
> for memory (since all threads share memory) and they also aid task/tgid
> migration.
>
> TODO's
>
> 1. Add support for unused_pages (so that accounting is accurate and consistent
> with beancounter accounting principles).
> 2. Add system call support to extract tgid information
> 3. Consider refactoring the code
>
> Signed-off-by: Balbir Singh <balbir@in.ibm.com>
> ---
>
> include/bc/beancounter.h | 62 +++++++++++++++++
> kernel/bc/beancounter.c | 166 +++++++++++++++++++++++++++++++++++++++++++++--
> kernel/bc/misc.c | 5 +
> kernel/fork.c | 4 -
> 4 files changed, 230 insertions(+), 7 deletions(-)
>
> diff -puN include/bc/beancounter.h~per-tgid-resource-tracking
> include/bc/beancounter.h
> --- linux-2.6.18-rc5/include/bc/beancounter.h~per-tgid-resource-tracking
> 2006-09-08 12:03:31.000000000 +0530
> +++ linux-2.6.18-rc5-balbir/include/bc/beancounter.h 2006-09-12
> 02:22:03.000000000 +0530
> @@ -42,7 +42,10 @@ struct bc_resource_parm {
> #include <linux/list.h>
> #include <asm/atomic.h>
>
> -#define BC_MAXVALUE LONG_MAX
> +#define BC_MAXVALUE LONG_MAX
> +
> +#define BC_TGID_HASH_BITS 6
> +#define BC_TGID_HASH_SIZE (1 << BC_TGID_HASH_BITS)
>
> /*
> * This magic is used to distinuish user beancounter and pages beancounter
> @@ -73,6 +76,18 @@ struct beancounter {
> #endif
> /* resources statistics and settings */
> struct bc_resource_parm bc_parms[BC_RESOURCES];
> + struct hlist_head tgid_hash[BC_TGID_HASH_SIZE];
> +};
> +
> +/*
> + * Per tgid resource statistics
> + */
> +struct tgid_beancounter {
> + struct bc_resource_parm tbc_parms[BC_RESOURCES];
> + struct hlist_node hash;
> + pid_t tgid;
> + struct beancounter *bc;
> + atomic_t tbc_refcount;
> };
>
> enum bc_severity { BC_BARRIER, BC_LIMIT, BC_FORCE };
> @@ -101,6 +116,16 @@ static inline void bc_adjust_maxheld(str
> parm->maxheld = parm->held;
> }
>
> +static inline void tbc_adjust_maxheld(struct tgid_beancounter *tbc,
> + int resource)
> +{
> + struct bc_resource_parm *parm;
> +
> + parm = &tbc->tbc_parms[resource];
> + if (parm->maxheld < parm->held)
> + parm->maxheld = parm->held;
> +}
> +
> static inline void bc_adjust_minheld(struct beancounter *bc, int resource)
> {
> struct bc_resource_parm *parm;
> @@ -110,6 +135,16 @@ static inline void bc_adjust_minheld(str
> parm->minheld = parm->held;
> }
>
> +static inline void tbc_adjust_minheld(struct tgid_beancounter *tbc,
> + int resource)
> +{
> + struct bc_resource_parm *parm;
> +
> + parm = &tbc->tbc_parms[resource];
> + if (parm->minheld > parm->held)
> + parm->minheld = parm->held;
> +}
> +
> int __must_check bc_charge_locked(struct beancounter *bc,
> int res, unsigned long val, enum bc_severity strict);
> int __must_check bc_charge(struct beancounter *bc,
> @@ -119,6 +154,11 @@ void bc_uncharge_locked(struct beancount
> void bc_uncharge(struct beancounter *bc, int res, unsigned long val);
>
> struct beancounter *beancounter_findcreate(bcid_t id, int mask);
> +struct tgid_beancounter *tgid_beancounter_findcreate(
> + struct beancounter *bc,
> + int mask,
> + int locked);
> +void tgid_beancounter_release(struct tgid_beancounter *tbc, int locked);
>
> static inline struct beancounter *get_beancounter(struct beancounter *bc)
> {
> @@ -126,7 +166,15 @@ static inline struct beancounter *get_be
> return bc;
> }
>
> +static inline struct tgid_beancounter *tgid_get_beancounter(
> + struct tgid_beancounter *tbc)
> +{
> + atomic_inc(&tbc->tbc_refcount);
> + return tbc;
> +}
> +
> void put_beancounter(struct beancounter *bc);
> +void tgid_put_beancounter(struct tgid_beancounter *tbc);
>
> void bc_init_early(void);
> void bc_init_late(void);
> @@ -135,6 +183,18 @@ void bc_init_proc(void);
> extern struct beancounter init_bc;
> extern const char *bc_rnames[];
>
> +#define tgid_beancounter_findcreate_locked(bc, mask) \
> + tgid_beancounter_findcreate(bc, mask, 1)
> +
> +#define tgid_beancounter_findcreate_unlocked(bc, mask) \
> + tgid_beancounter_findcreate(bc, mask, 0)
> +
> +#define tgid_beancounter_release_locked(bc) \
> + tgid_beancounter_release(bc, 1)
> +
> +#define tgid_beancounter_release_unlocked(bc) \
> + tgid_beancounter_release(bc, 0)
> +
> #else /* CONFIG_BEANCOUNTERS */
>
> #define nr_beancounters 0
> diff -puN kernel/bc/beancounter.c~per-tgid-resource-tracking kernel/bc/beancounter.c
> --- linux-2.6.18-rc5/kernel/bc/beancounter.c~per-tgid-resource-tracking
> 2006-09-08 12:03:31.000000000 +0530
> +++ linux-2.6.18-rc5-balbir/kernel/bc/beancounter.c 2006-09-12
> 02:45:53.000000000 +0530
> @@ -14,9 +14,13 @@
> #include <bc/vmrss.h>
>
> static kmem_cache_t *bc_cachep;
> +static kmem_cache_t *bc_tgid_cachep;
> static struct beancounter default_beancounter;
> +static struct tgid_beancounter default_tgid_beancounter;
>
> static void init_beancounter_struct(struct beancounter *bc, bcid_t id);
> +static void init_tgid_beancounter_struct(struct tgid_beancounter *tbc,
> + struct beancounter *bc);
>
> struct beancounter init_bc;
>
> @@ -34,6 +38,7 @@ const char *bc_rnames[] = {
> static struct hlist_head bc_hash[BC_HASH_SIZE];
> static spinlock_t bc_hash_lock;
> #define bc_hash_fn(bcid) (hash_long(bcid, BC_HASH_BITS))
> +#define bc_tgid_hash_fn(bcid) (hash_long(bcid, BC_TGID_HASH_BITS))
>
> /*
> * Per resource beancounting. Resources are tied to their bc id.
> @@ -97,6 +102,103 @@ out:
> return new_bc;
> }
>
> +/*
> + * Introduce a hierarchy for beancounters.
> + * bc
> + * tbc tbc ... tbc tbc
> + * Each tgid_beancounter tracks the resource usage for the tgid.
> + * It makes it easier to move tasks across beancounters, since we know
> + * the usage of every tgid. It's quite easy to extend this detail to a
> + * per-task level, by creating task_beancounters under each tgid_beancounter.
> + */
> +struct tgid_beancounter *tgid_beancounter_findcreate(struct beancounter *bc,
> + int mask, int locked)
> +{
> + struct tgid_beancounter *new_tbc, *tbc = NULL;
> + unsigned long flags = 0; /* use a macro to hide if reqd */
> + struct hlist_head *slot = NULL;
> + struct hlist_node *pos = NULL;
> +
> + get_beancounter(bc);
> + slot = &bc->tgid_hash[bc_tgid_hash_fn(current->tgid)];
> + new_tbc = NULL;
> +
> +retry:
> + if (!locked)
> + spin_lock_irqsave(&bc->bc_lock, flags);
> + hlist_for_each_entry (tbc, pos, slot, hash)
> + if (tbc->tgid == current->tgid)
> + break;
> +
> + if (pos != NULL) {
> + if (!(mask & BC_ALLOC))
> + put_beancounter(bc);
> + if (mask & BC_ALLOC)
> + tgid_get_beancounter(tbc);
> + if (!locked)
> + spin_unlock_irqrestore(&bc->bc_lock, flags);
> +
> + if (new_tbc != NULL)
> + kmem_cache_free(bc_tgid_cachep, new_tbc);
> + return tbc;
> + }
> +
> + if (new_tbc != NULL)
> + goto out_install;
> +
> + if (!locked)
> + spin_unlock_irqrestore(&bc->bc_lock, flags);
> +
> + if (!(mask & BC_ALLOC))
> + goto out;
> +
> + new_tbc = kmem_cache_alloc(bc_tgid_cachep,
> + mask & BC_ALLOC_ATOMIC ? GFP_ATOMIC : GFP_KERNEL);
> + if (new_tbc == NULL)
> + goto out;
> +
> + init_tgid_beancounter_struct(new_tbc, bc);
> + goto retry;
> +
> +out_install:
> + hlist_add_head(&new_tbc->hash, slot);
> + if (!locked)
> + spin_unlock_irqrestore(&bc->bc_lock, flags);
> +out:
> + if (!(mask & BC_ALLOC))
> + put_beancounter(bc);
> + if (new_tbc == NULL) {
> + new_tbc = &default_tgid_beancounter;
> + }
> + return new_tbc;
> +}
> +
> +void tgid_put_beancounter(struct tgid_beancounter *tbc)
> +{
> + int i;
> + unsigned long flags = 0;
> + struct beancounter *bc = tbc->bc;
> +
> + if (tbc == &default_tgid_beancounter) {
> + return;
> + }
> +
> + put_beancounter(bc);
> + if (!atomic_dec_and_lock_irqsave(&tbc->tbc_refcount, &bc->bc_lock,
> + flags))
> + return;
> +
> + for (i = 0; i < BC_RESOURCES; i++)
> + if (tbc->tbc_parms[i].held != 0)
> + printk("BC: %d has %lu of %s held on put\n", tbc->tgid,
> + tbc->tbc_parms[i].held, bc_rnames[i]);
> +
> + hlist_del(&tbc->hash);
> + spin_unlock_irqrestore(&bc->bc_lock, flags);
> +
> + kmem_cache_free(bc_tgid_cachep, tbc);
> +}
> +
> void put_beancounter(struct beancounter *bc)
> {
> int i;
> @@ -110,15 +212,15 @@ void put_beancounter(struct beancounter
>
> for (i = 0; i < BC_RESOURCES; i++)
> if (bc->bc_parms[i].held != 0)
> - printk("BC: %d has %lu of %s held on put", bc->bc_id,
> + printk("BC: %d has %lu of %s held on put\n", bc->bc_id,
> bc->bc_parms[i].held, bc_rnames[i]);
>
> if (bc->unused_privvmpages != 0)
> - printk("BC: %d has %lu of unused pages held on put", bc->bc_id,
> - bc->unused_privvmpages);
> + printk("BC: %d has %lu of unused pages held on put\n",
> + bc->bc_id, bc->unused_privvmpages);
> #ifdef CONFIG_BEANCOUNTERS_RSS
> if (bc->rss_pages != 0)
> - printk("BC: %d hash %llu of rss pages held on put", bc->bc_id,
> + printk("BC: %d hash %llu of rss pages held on put\n", bc->bc_id,
> bc->rss_pages);
> #endif
> hlist_del(&bc->hash);
> @@ -139,12 +241,22 @@ int bc_charge_locked(struct beancounter
> enum bc_severity strict)
> {
> unsigned long new_held;
> + unsigned long tgid_new_held;
> + struct tgid_beancounter *tbc;
> +
> + tbc = tgid_beancounter_findcreate_locked(bc, BC_LOOKUP);
> + if (!tbc) {
> + printk(KERN_WARNING "Missing tgid beancounter for bc %d tgid "
> + "%d\n", bc->bc_id, current->tgid);
> + return 0;
> + }
>
> /*
> * bc_value <= BC_MAXVALUE, value <= BC_MAXVALUE, and only one addition
> * at the moment is possible so an overflow is impossible.
> */
> new_held = bc->bc_parms[resource].held + val;
> + tgid_new_held = tbc->tbc_parms[resource].held + val;
>
> switch (strict) {
> case BC_BARRIER:
> @@ -160,6 +272,7 @@ int bc_charge_locked(struct beancounter
> case BC_FORCE:
> bc->bc_parms[resource].held = new_held;
> bc_adjust_maxheld(bc, resource);
> + tbc_adjust_maxheld(tbc, resource);
> return 0;
>
> default:
> @@ -167,6 +280,7 @@ int bc_charge_locked(struct beancounter
> }
>
> bc->bc_parms[resource].failcnt++;
> + tbc->tbc_parms[resource].failcnt++;
> return -ENOMEM;
> }
> EXPORT_SYMBOL_GPL(bc_charge_locked);
> @@ -189,6 +303,25 @@ EXPORT_SYMBOL_GPL(bc_charge);
> /* called with bc->bc_lock held and interrupts disabled */
> void bc_uncharge_locked(struct beancounter *bc, int resource, unsigned long val)
> {
> + struct tgid_beancounter *tbc;
> + unsigned long val2 = val;
> +
> + tbc = tgid_beancounter_findcreate_locked(bc, BC_LOOKUP);
> + if (!tbc) {
> + printk(KERN_WARNING "Missing tgid beancounter for bc %d tgid "
> + "%d\n", bc->bc_id, current->tgid);
> + return;
> + }
> +
> + if (unlikely(tbc->tbc_parms[resource].held < val2)) {
> + printk("BC: overuncharging bc %d %s: val %lu, holds %lu\n",
> + tbc->tgid, bc_rnames[resource], val2,
> + tbc->tbc_parms[resource].held);
> + val2 = tbc->tbc_parms[resource].held;
> + }
> + tbc->tbc_parms[resource].held -= val;
> + tbc_adjust_minheld(tbc, resource);
> +
> if (unlikely(bc->bc_parms[resource].held < val)) {
> printk("BC: overuncharging bc %d %s: val %lu, holds %lu\n",
> bc->bc_id, bc_rnames[resource], val,
> @@ -199,6 +332,7 @@ void bc_uncharge_locked(struct beancount
> bc->bc_parms[resource].held -= val;
> bc_adjust_minheld(bc, resource);
> }
> +
> EXPORT_SYMBOL_GPL(bc_uncharge_locked);
>
> void bc_uncharge(struct beancounter *bc, int resource, unsigned long val)
> @@ -227,12 +361,31 @@ EXPORT_SYMBOL_GPL(bc_uncharge);
>
> static void init_beancounter_struct(struct beancounter *bc, bcid_t id)
> {
> + int i;
> +
> bc->bc_magic = BC_MAGIC;
> atomic_set(&bc->bc_refcount, 1);
> spin_lock_init(&bc->bc_lock);
> bc->bc_id = id;
> + for (i = 0; i < BC_TGID_HASH_SIZE; i++)
> + INIT_HLIST_HEAD(&bc->tgid_hash[i]);
> }
>
> +static void init_tgid_beancounter_struct(struct tgid_beancounter *tbc,
> + struct beancounter *bc)
> +{
> + int k;
> +
> + INIT_HLIST_NODE(&tbc->hash);
> + atomic_set(&tbc->tbc_refcount, 1);
> + tbc->bc = bc;
> + tbc->tgid = current->tgid;
> + for (k = 0; k < BC_RESOURCES; k++) {
> + tbc->tbc_parms[k].limit = BC_MAXVALUE;
> + tbc->tbc_parms[k].barrier = BC_MAXVALUE;
> + tbc->tbc_parms[k].held = 0;
> + }
> +}
> static void init_beancounter_nolimits(struct beancounter *bc)
> {
> int k;
> @@ -281,7 +434,12 @@ void __init bc_init_late(void)
> sizeof(struct beancounter), 0,
> SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL, NULL);
>
> + bc_tgid_cachep = kmem_cache_create("tgid_beancounters",
> + sizeof(struct tgid_beancounter), 0,
> + SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL, NULL);
> +
> bc = &default_beancounter;
> init_beancounter_syslimits(bc);
> init_beancounter_struct(bc, 0);
> + init_tgid_beancounter_struct(&default_tgid_beancounter, bc);
> }
> diff -puN kernel/bc/misc.c~per-tgid-resource-tracking kernel/bc/misc.c
> --- linux-2.6.18-rc5/kernel/bc/misc.c~per-tgid-resource-tracking 2006-09-08
> 14:18:55.000000000 +0530
> +++ linux-2.6.18-rc5-balbir/kernel/bc/misc.c 2006-09-12 02:15:07.000000000 +0530
> @@ -22,10 +22,15 @@ void bc_task_charge(struct task_struct *
> bc = old_bc->fork_bc;
> new_bc->exec_bc = get_beancounter(bc);
> new_bc->fork_bc = get_beancounter(bc);
> + tgid_beancounter_findcreate_unlocked(bc, BC_ALLOC);
> }
>
> void bc_task_uncharge(struct task_struct *tsk)
> {
> + struct tgid_beancounter *tbc;
> + tbc = tgid_beancounter_findcreate_unlocked(tsk->task_bc.exec_bc,
> + BC_LOOKUP);
> put_beancounter(tsk->task_bc.exec_bc);
> put_beancounter(tsk->task_bc.fork_bc);
> + tgid_put_beancounter(tbc);
> }
> diff -puN kernel/fork.c~per-tgid-resource-tracking kernel/fork.c
> --- linux-2.6.18-rc5/kernel/fork.c~per-tgid-resource-tracking 2006-09-11
> 23:53:11.000000000 +0530
> +++ linux-2.6.18-rc5-balbir/kernel/fork.c 2006-09-12 02:04:49.000000000 +0530
> @@ -994,8 +994,6 @@ static struct task_struct *copy_process(
> if (!p)
> goto fork_out;
>
> - bc_task_charge(current, p);
> -
> #ifdef CONFIG_TRACE_IRQFLAGS
> DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
> DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
> @@ -1106,6 +1104,8 @@ static struct task_struct *copy_process(
> if (clone_flags & CLONE_THREAD)
> p->tgid = current->tgid;
>
> + bc_task_charge(current, p);
> +
> if ((retval = security_task_alloc(p)))
> goto bad_fork_cleanup_policy;
> if ((retval = audit_alloc(p)))
> _
>

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