litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/include/linux/console_struct.h

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Memory controller: resource counters' href='/cgit/cgit.cgi/litmus-rt-edfsc.git/commit/kernel/res_counter.c?id=e552b6617067ab785256dcec5ca29eeea981aacb'>e552b6617067

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/*
 * resource cgroups
 *
 * Copyright 2007 OpenVZ SWsoft Inc
 *
 * Author: Pavel Emelianov <xemul@openvz.org>
 *
 */

#include <linux/types.h>
#include <linux/parser.h>
#include <linux/fs.h>
#include <linux/res_counter.h>
#include <linux/uaccess.h>
#include <linux/mm.h>

void res_counter_init(struct res_counter *counter, struct res_counter *parent)
{
	spin_lock_init(&counter->lock);
	counter->limit = RESOURCE_MAX;
	counter->soft_limit = RESOURCE_MAX;
	counter->parent = parent;
}

int res_counter_charge_locked(struct res_counter *counter, unsigned long val,
			      bool force)
{
	int ret = 0;

	if (counter->usage + val > counter->limit) {
		counter->failcnt++;
		ret = -ENOMEM;
		if (!force)
			return ret;
	}

	counter->usage += val;
	if (counter->usage > counter->max_usage)
		counter->max_usage = counter->usage;
	return ret;
}

static int __res_counter_charge(struct res_counter *counter, unsigned long val,
				struct res_counter **limit_fail_at, bool force)
{
	int ret, r;
	unsigned long flags;
	struct res_counter *c, *u;

	r = ret = 0;
	*limit_fail_at = NULL;
	local_irq_save(flags);
	for (c = counter; c != NULL; c = c->parent) {
		spin_lock(&c->lock);
		r = res_counter_charge_locked(c, val, force);
		spin_unlock(&c->lock);
		if (r < 0 && !ret) {
			ret = r;
			*limit_fail_at = c;
			if (!force)
				break;
		}
	}

	if (ret < 0 && !force) {
		for (u = counter; u != c; u = u->parent) {
			spin_lock(&u->lock);
			res_counter_uncharge_locked(u, val);
			spin_unlock(&u->lock);
		}
	}
	local_irq_restore(flags);

	return ret;
}

int res_counter_charge(struct res_counter *counter, unsigned long val,
			struct res_counter **limit_fail_at)
{
	return __res_counter_charge(counter, val, limit_fail_at, false);
}

int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
			      struct res_counter **limit_fail_at)
{
	return __res_counter_charge(counter, val, limit_fail_at, true);
}

u64 res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
{
	if (WARN_ON(counter->usage < val))
		val = counter->usage;

	counter->usage -= val;
	return counter->usage;
}

u64 res_counter_uncharge_until(struct res_counter *counter,
			       struct res_counter *top,
			       unsigned long val)
{
	unsigned long flags;
	struct res_counter *c;
	u64 ret = 0;

	local_irq_save(flags);
	for (c = counter; c != top; c = c->parent) {
		u64 r;
		spin_lock(&c->lock);


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