1 files changed, 182 insertions, 173 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 48a976c52cf5..8da627d33804 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -127,6 +127,7 @@ struct cpuset_hotplug_scanner {
 typedef enum {
 	CS_CPU_EXCLUSIVE,
 	CS_MEM_EXCLUSIVE,
+	CS_MEM_HARDWALL,
 	CS_MEMORY_MIGRATE,
 	CS_SCHED_LOAD_BALANCE,
 	CS_SPREAD_PAGE,
@@ -144,6 +145,11 @@ static inline int is_mem_exclusive(const struct cpuset *cs)
 	return test_bit(CS_MEM_EXCLUSIVE, &cs->flags);
 }
 
+static inline int is_mem_hardwall(const struct cpuset *cs)
+{
+	return test_bit(CS_MEM_HARDWALL, &cs->flags);
+}
+
 static inline int is_sched_load_balance(const struct cpuset *cs)
 {
 	return test_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
@@ -735,7 +741,8 @@ static inline int started_after(void *p1, void *p2)
  * Return nonzero if this tasks's cpus_allowed mask should be changed (in other
  * words, if its mask is not equal to its cpuset's mask).
  */
-int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
+static int cpuset_test_cpumask(struct task_struct *tsk,
+			       struct cgroup_scanner *scan)
 {
 	return !cpus_equal(tsk->cpus_allowed,
 			(cgroup_cs(scan->cg))->cpus_allowed);
@@ -752,7 +759,8 @@ int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
  * We don't need to re-check for the cgroup/cpuset membership, since we're
  * holding cgroup_lock() at this point.
  */
-void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
+static void cpuset_change_cpumask(struct task_struct *tsk,
+				  struct cgroup_scanner *scan)
 {
 	set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed));
 }
@@ -1023,19 +1031,6 @@ int current_cpuset_is_being_rebound(void)
 	return task_cs(current) == cpuset_being_rebound;
 }
 
-/*
- * Call with cgroup_mutex held.
- */
-
-static int update_memory_pressure_enabled(struct cpuset *cs, char *buf)
-{
-	if (simple_strtoul(buf, NULL, 10) != 0)
-		cpuset_memory_pressure_enabled = 1;
-	else
-		cpuset_memory_pressure_enabled = 0;
-	return 0;
-}
-
 static int update_relax_domain_level(struct cpuset *cs, char *buf)
 {
 	int val = simple_strtol(buf, NULL, 10);
@@ -1053,25 +1048,20 @@ static int update_relax_domain_level(struct cpuset *cs, char *buf)
 
 /*
  * update_flag - read a 0 or a 1 in a file and update associated flag
- * bit:	the bit to update (CS_CPU_EXCLUSIVE, CS_MEM_EXCLUSIVE,
- *				CS_SCHED_LOAD_BALANCE,
- *				CS_NOTIFY_ON_RELEASE, CS_MEMORY_MIGRATE,
- *				CS_SPREAD_PAGE, CS_SPREAD_SLAB)
- * cs:	the cpuset to update
- * buf:	the buffer where we read the 0 or 1
+ * bit:		the bit to update (see cpuset_flagbits_t)
+ * cs:		the cpuset to update
+ * turning_on: 	whether the flag is being set or cleared
  *
  * Call with cgroup_mutex held.
  */
 
-static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs, char *buf)
+static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
+		       int turning_on)
 {
-	int turning_on;
 	struct cpuset trialcs;
 	int err;
 	int cpus_nonempty, balance_flag_changed;
 
-	turning_on = (simple_strtoul(buf, NULL, 10) != 0);
-
 	trialcs = *cs;
 	if (turning_on)
 		set_bit(bit, &trialcs.flags);
@@ -1241,6 +1231,7 @@ typedef enum {
 	FILE_MEMLIST,
 	FILE_CPU_EXCLUSIVE,
 	FILE_MEM_EXCLUSIVE,
+	FILE_MEM_HARDWALL,
 	FILE_SCHED_LOAD_BALANCE,
 	FILE_SCHED_RELAX_DOMAIN_LEVEL,
 	FILE_MEMORY_PRESSURE_ENABLED,
@@ -1289,46 +1280,71 @@ static ssize_t cpuset_common_file_write(struct cgroup *cont,
 	case FILE_MEMLIST:
 		retval = update_nodemask(cs, buffer);
 		break;
+	case FILE_SCHED_RELAX_DOMAIN_LEVEL:
+		retval = update_relax_domain_level(cs, buffer);
+		break;
+	default:
+		retval = -EINVAL;
+		goto out2;
+	}
+
+	if (retval == 0)
+		retval = nbytes;
+out2:
+	cgroup_unlock();
+out1:
+	kfree(buffer);
+	return retval;
+}
+
+static int cpuset_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+	int retval = 0;
+	struct cpuset *cs = cgroup_cs(cgrp);
+	cpuset_filetype_t type = cft->private;
+
+	cgroup_lock();
+
+	if (cgroup_is_removed(cgrp)) {
+		cgroup_unlock();
+		return -ENODEV;
+	}
+
+	switch (type) {
 	case FILE_CPU_EXCLUSIVE:
-		retval = update_flag(CS_CPU_EXCLUSIVE, cs, buffer);
+		retval = update_flag(CS_CPU_EXCLUSIVE, cs, val);
 		break;
 	case FILE_MEM_EXCLUSIVE:
-		retval = update_flag(CS_MEM_EXCLUSIVE, cs, buffer);
+		retval = update_flag(CS_MEM_EXCLUSIVE, cs, val);
 		break;
-	case FILE_SCHED_LOAD_BALANCE:
-		retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, buffer);
+	case FILE_MEM_HARDWALL:
+		retval = update_flag(CS_MEM_HARDWALL, cs, val);
 		break;
-	case FILE_SCHED_RELAX_DOMAIN_LEVEL:
-		retval = update_relax_domain_level(cs, buffer);
+	case FILE_SCHED_LOAD_BALANCE:
+		retval = update_flag(CS_SCHED_LOAD_BALANCE, cs, val);
 		break;
 	case FILE_MEMORY_MIGRATE:
-		retval = update_flag(CS_MEMORY_MIGRATE, cs, buffer);
+		retval = update_flag(CS_MEMORY_MIGRATE, cs, val);
 		break;
 	case FILE_MEMORY_PRESSURE_ENABLED:
-		retval = update_memory_pressure_enabled(cs, buffer);
+		cpuset_memory_pressure_enabled = !!val;
 		break;
 	case FILE_MEMORY_PRESSURE:
 		retval = -EACCES;
 		break;
 	case FILE_SPREAD_PAGE:
-		retval = update_flag(CS_SPREAD_PAGE, cs, buffer);
+		retval = update_flag(CS_SPREAD_PAGE, cs, val);
 		cs->mems_generation = cpuset_mems_generation++;
 		break;
 	case FILE_SPREAD_SLAB:
-		retval = update_flag(CS_SPREAD_SLAB, cs, buffer);
+		retval = update_flag(CS_SPREAD_SLAB, cs, val);
 		cs->mems_generation = cpuset_mems_generation++;
 		break;
 	default:
 		retval = -EINVAL;
-		goto out2;
+		break;
 	}
-
-	if (retval == 0)
-		retval = nbytes;
-out2:
 	cgroup_unlock();
-out1:
-	kfree(buffer);
 	return retval;
 }
 
@@ -1390,33 +1406,9 @@ static ssize_t cpuset_common_file_read(struct cgroup *cont,
 	case FILE_MEMLIST:
 		s += cpuset_sprintf_memlist(s, cs);
 		break;
-	case FILE_CPU_EXCLUSIVE:
-		*s++ = is_cpu_exclusive(cs) ? '1' : '0';
-		break;
-	case FILE_MEM_EXCLUSIVE:
-		*s++ = is_mem_exclusive(cs) ? '1' : '0';
-		break;
-	case FILE_SCHED_LOAD_BALANCE:
-		*s++ = is_sched_load_balance(cs) ? '1' : '0';
-		break;
 	case FILE_SCHED_RELAX_DOMAIN_LEVEL:
 		s += sprintf(s, "%d", cs->relax_domain_level);
 		break;
-	case FILE_MEMORY_MIGRATE:
-		*s++ = is_memory_migrate(cs) ? '1' : '0';
-		break;
-	case FILE_MEMORY_PRESSURE_ENABLED:
-		*s++ = cpuset_memory_pressure_enabled ? '1' : '0';
-		break;
-	case FILE_MEMORY_PRESSURE:
-		s += sprintf(s, "%d", fmeter_getrate(&cs->fmeter));
-		break;
-	case FILE_SPREAD_PAGE:
-		*s++ = is_spread_page(cs) ? '1' : '0';
-		break;
-	case FILE_SPREAD_SLAB:
-		*s++ = is_spread_slab(cs) ? '1' : '0';
-		break;
 	default:
 		retval = -EINVAL;
 		goto out;
@@ -1429,121 +1421,137 @@ out:
 	return retval;
 }
 
-
-
+static u64 cpuset_read_u64(struct cgroup *cont, struct cftype *cft)
+{
+	struct cpuset *cs = cgroup_cs(cont);
+	cpuset_filetype_t type = cft->private;
+	switch (type) {
+	case FILE_CPU_EXCLUSIVE:
+		return is_cpu_exclusive(cs);
+	case FILE_MEM_EXCLUSIVE:
+		return is_mem_exclusive(cs);
+	case FILE_MEM_HARDWALL:
+		return is_mem_hardwall(cs);
+	case FILE_SCHED_LOAD_BALANCE:
+		return is_sched_load_balance(cs);
+	case FILE_MEMORY_MIGRATE:
+		return is_memory_migrate(cs);
+	case FILE_MEMORY_PRESSURE_ENABLED:
+		return cpuset_memory_pressure_enabled;
+	case FILE_MEMORY_PRESSURE:
+		return fmeter_getrate(&cs->fmeter);
+	case FILE_SPREAD_PAGE:
+		return is_spread_page(cs);
+	case FILE_SPREAD_SLAB:
+		return is_spread_slab(cs);
+	default:
+		BUG();
+	}
+}
 
 
 /*
  * for the common functions, 'private' gives the type of file
  */
 
-static struct cftype cft_cpus = {
-	.name = "cpus",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_CPULIST,
-};
-
-static struct cftype cft_mems = {
-	.name = "mems",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_MEMLIST,
-};
-
-static struct cftype cft_cpu_exclusive = {
-	.name = "cpu_exclusive",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_CPU_EXCLUSIVE,
-};
-
-static struct cftype cft_mem_exclusive = {
-	.name = "mem_exclusive",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_MEM_EXCLUSIVE,
-};
-
-static struct cftype cft_sched_load_balance = {
-	.name = "sched_load_balance",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_SCHED_LOAD_BALANCE,
-};
-
-static struct cftype cft_sched_relax_domain_level = {
-	.name = "sched_relax_domain_level",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_SCHED_RELAX_DOMAIN_LEVEL,
-};
-
-static struct cftype cft_memory_migrate = {
-	.name = "memory_migrate",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_MEMORY_MIGRATE,
+static struct cftype files[] = {
+	{
+		.name = "cpus",
+		.read = cpuset_common_file_read,
+		.write = cpuset_common_file_write,
+		.private = FILE_CPULIST,
+	},
+
+	{
+		.name = "mems",
+		.read = cpuset_common_file_read,
+		.write = cpuset_common_file_write,
+		.private = FILE_MEMLIST,
+	},
+
+	{
+		.name = "cpu_exclusive",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_CPU_EXCLUSIVE,
+	},
+
+	{
+		.name = "mem_exclusive",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_MEM_EXCLUSIVE,
+	},
+
+	{
+		.name = "mem_hardwall",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_MEM_HARDWALL,
+	},
+
+	{
+		.name = "sched_load_balance",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_SCHED_LOAD_BALANCE,
+	},
+
+	{
+		.name = "sched_relax_domain_level",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_SCHED_RELAX_DOMAIN_LEVEL,
+	},
+
+	{
+		.name = "memory_migrate",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_MEMORY_MIGRATE,
+	},
+
+	{
+		.name = "memory_pressure",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_MEMORY_PRESSURE,
+	},
+
+	{
+		.name = "memory_spread_page",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_SPREAD_PAGE,
+	},
+
+	{
+		.name = "memory_spread_slab",
+		.read_u64 = cpuset_read_u64,
+		.write_u64 = cpuset_write_u64,
+		.private = FILE_SPREAD_SLAB,
+	},
 };
 
 static struct cftype cft_memory_pressure_enabled = {
 	.name = "memory_pressure_enabled",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
+	.read_u64 = cpuset_read_u64,
+	.write_u64 = cpuset_write_u64,
 	.private = FILE_MEMORY_PRESSURE_ENABLED,
 };
 
-static struct cftype cft_memory_pressure = {
-	.name = "memory_pressure",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_MEMORY_PRESSURE,
-};
-
-static struct cftype cft_spread_page = {
-	.name = "memory_spread_page",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_SPREAD_PAGE,
-};
-
-static struct cftype cft_spread_slab = {
-	.name = "memory_spread_slab",
-	.read = cpuset_common_file_read,
-	.write = cpuset_common_file_write,
-	.private = FILE_SPREAD_SLAB,
-};
-
 static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
 {
 	int err;
 
-	if ((err = cgroup_add_file(cont, ss, &cft_cpus)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_mems)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_cpu_exclusive)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_mem_exclusive)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_memory_migrate)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_sched_load_balance)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss,
-					&cft_sched_relax_domain_level)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_memory_pressure)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_spread_page)) < 0)
-		return err;
-	if ((err = cgroup_add_file(cont, ss, &cft_spread_slab)) < 0)
+	err = cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
+	if (err)
 		return err;
 	/* memory_pressure_enabled is in root cpuset only */
-	if (err == 0 && !cont->parent)
+	if (!cont->parent)
 		err = cgroup_add_file(cont, ss,
-					 &cft_memory_pressure_enabled);
-	return 0;
+				      &cft_memory_pressure_enabled);
+	return err;
 }
 
 /*
@@ -1643,7 +1651,7 @@ static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
 	cpuset_update_task_memory_state();
 
 	if (is_sched_load_balance(cs))
-		update_flag(CS_SCHED_LOAD_BALANCE, cs, "0");
+		update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
 
 	number_of_cpusets--;
 	kfree(cs);
@@ -1708,7 +1716,8 @@ int __init cpuset_init(void)
  * Called by cgroup_scan_tasks() for each task in a cgroup.
  * Return nonzero to stop the walk through the tasks.
  */
-void cpuset_do_move_task(struct task_struct *tsk, struct cgroup_scanner *scan)
+static void cpuset_do_move_task(struct task_struct *tsk,
+				struct cgroup_scanner *scan)
 {
 	struct cpuset_hotplug_scanner *chsp;
 
@@ -1970,14 +1979,14 @@ int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 }
 
 /*
- * nearest_exclusive_ancestor() - Returns the nearest mem_exclusive
- * ancestor to the specified cpuset.  Call holding callback_mutex.
- * If no ancestor is mem_exclusive (an unusual configuration), then
- * returns the root cpuset.
+ * nearest_hardwall_ancestor() - Returns the nearest mem_exclusive or
+ * mem_hardwall ancestor to the specified cpuset.  Call holding
+ * callback_mutex.  If no ancestor is mem_exclusive or mem_hardwall
+ * (an unusual configuration), then returns the root cpuset.
  */
-static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs)
+static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs)
 {
-	while (!is_mem_exclusive(cs) && cs->parent)
+	while (!(is_mem_exclusive(cs) || is_mem_hardwall(cs)) && cs->parent)
 		cs = cs->parent;
 	return cs;
 }
@@ -1991,7 +2000,7 @@ static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs)
  * __GFP_THISNODE is set, yes, we can always allocate.  If zone
  * z's node is in our tasks mems_allowed, yes.  If it's not a
  * __GFP_HARDWALL request and this zone's nodes is in the nearest
- * mem_exclusive cpuset ancestor to this tasks cpuset, yes.
+ * hardwalled cpuset ancestor to this tasks cpuset, yes.
  * If the task has been OOM killed and has access to memory reserves
  * as specified by the TIF_MEMDIE flag, yes.
  * Otherwise, no.
@@ -2014,7 +2023,7 @@ static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs)
  * and do not allow allocations outside the current tasks cpuset
  * unless the task has been OOM killed as is marked TIF_MEMDIE.
  * GFP_KERNEL allocations are not so marked, so can escape to the
- * nearest enclosing mem_exclusive ancestor cpuset.
+ * nearest enclosing hardwalled ancestor cpuset.
  *
  * Scanning up parent cpusets requires callback_mutex.  The
  * __alloc_pages() routine only calls here with __GFP_HARDWALL bit
@@ -2037,7 +2046,7 @@ static const struct cpuset *nearest_exclusive_ancestor(const struct cpuset *cs)
  *	in_interrupt - any node ok (current task context irrelevant)
  *	GFP_ATOMIC   - any node ok
  *	TIF_MEMDIE   - any node ok
- *	GFP_KERNEL   - any node in enclosing mem_exclusive cpuset ok
+ *	GFP_KERNEL   - any node in enclosing hardwalled cpuset ok
  *	GFP_USER     - only nodes in current tasks mems allowed ok.
  *
  * Rule:
@@ -2074,7 +2083,7 @@ int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 	mutex_lock(&callback_mutex);
 
 	task_lock(current);
-	cs = nearest_exclusive_ancestor(task_cs(current));
+	cs = nearest_hardwall_ancestor(task_cs(current));
 	task_unlock(current);
 
 	allowed = node_isset(node, cs->mems_allowed);