The patch titled
sched_domain: handle kmalloc failure
has been removed from the -mm tree. Its filename is
sched_domain-handle-kmalloc-failure.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sched_domain: handle kmalloc failure
From: Srivatsa Vaddagiri <vatsa@xxxxxxxxxx>
Try to handle mem allocation failures in build_sched_domains by bailing out
and cleaning up thus-far allocated memory. The patch has a direct consequence
that we disable load balancing completely (even at sibling level) upon *any*
memory allocation failure.
[Lee.Schermerhorn@xxxxxx: bugfix]
Signed-off-by: Srivatsa Vaddagir <vatsa@xxxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "Siddha, Suresh B" <suresh.b.siddha@xxxxxxxxx>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/sched.h | 2
kernel/sched.c | 139 ++++++++++++++++++++++------------------
2 files changed, 79 insertions(+), 62 deletions(-)
diff -puN include/linux/sched.h~sched_domain-handle-kmalloc-failure include/linux/sched.h
--- a/include/linux/sched.h~sched_domain-handle-kmalloc-failure
+++ a/include/linux/sched.h
@@ -639,7 +639,7 @@ struct sched_domain {
#endif
};
-extern void partition_sched_domains(cpumask_t *partition1,
+extern int partition_sched_domains(cpumask_t *partition1,
cpumask_t *partition2);
/*
diff -puN kernel/sched.c~sched_domain-handle-kmalloc-failure kernel/sched.c
--- a/kernel/sched.c~sched_domain-handle-kmalloc-failure
+++ a/kernel/sched.c
@@ -5820,11 +5820,56 @@ next_sg:
}
#endif
+/* Free memory allocated for various sched_group structures */
+static void free_sched_groups(const cpumask_t *cpu_map)
+{
+#ifdef CONFIG_NUMA
+ int i;
+ int cpu;
+
+ for_each_cpu_mask(cpu, *cpu_map) {
+ struct sched_group *sched_group_allnodes
+ = sched_group_allnodes_bycpu[cpu];
+ struct sched_group **sched_group_nodes
+ = sched_group_nodes_bycpu[cpu];
+
+ if (sched_group_allnodes) {
+ kfree(sched_group_allnodes);
+ sched_group_allnodes_bycpu[cpu] = NULL;
+ }
+
+ if (!sched_group_nodes)
+ continue;
+
+ for (i = 0; i < MAX_NUMNODES; i++) {
+ cpumask_t nodemask = node_to_cpumask(i);
+ struct sched_group *oldsg, *sg = sched_group_nodes[i];
+
+ cpus_and(nodemask, nodemask, *cpu_map);
+ if (cpus_empty(nodemask))
+ continue;
+
+ if (sg == NULL)
+ continue;
+ sg = sg->next;
+next_sg:
+ oldsg = sg;
+ sg = sg->next;
+ kfree(oldsg);
+ if (oldsg != sched_group_nodes[i])
+ goto next_sg;
+ }
+ kfree(sched_group_nodes);
+ sched_group_nodes_bycpu[cpu] = NULL;
+ }
+#endif
+}
+
/*
* Build sched domains for a given set of cpus and attach the sched domains
* to the individual cpus
*/
-void build_sched_domains(const cpumask_t *cpu_map)
+static int build_sched_domains(const cpumask_t *cpu_map)
{
int i;
#ifdef CONFIG_NUMA
@@ -5834,11 +5879,11 @@ void build_sched_domains(const cpumask_t
/*
* Allocate the per-node list of sched groups
*/
- sched_group_nodes = kmalloc(sizeof(struct sched_group*)*MAX_NUMNODES,
+ sched_group_nodes = kzalloc(sizeof(struct sched_group*)*MAX_NUMNODES,
GFP_ATOMIC);
if (!sched_group_nodes) {
printk(KERN_WARNING "Can not alloc sched group node list\n");
- return;
+ return -ENOMEM;
}
sched_group_nodes_bycpu[first_cpu(*cpu_map)] = sched_group_nodes;
#endif
@@ -5864,7 +5909,7 @@ void build_sched_domains(const cpumask_t
if (!sched_group_allnodes) {
printk(KERN_WARNING
"Can not alloc allnodes sched group\n");
- break;
+ goto error;
}
sched_group_allnodes_bycpu[i]
= sched_group_allnodes;
@@ -5978,23 +6023,20 @@ void build_sched_domains(const cpumask_t
cpus_and(domainspan, domainspan, *cpu_map);
sg = kmalloc(sizeof(struct sched_group), GFP_KERNEL);
+ if (!sg) {
+ printk(KERN_WARNING "Can not alloc domain group for "
+ "node %d\n", i);
+ goto error;
+ }
sched_group_nodes[i] = sg;
for_each_cpu_mask(j, nodemask) {
struct sched_domain *sd;
sd = &per_cpu(node_domains, j);
sd->groups = sg;
- if (sd->groups == NULL) {
- /* Turn off balancing if we have no groups */
- sd->flags = 0;
- }
- }
- if (!sg) {
- printk(KERN_WARNING
- "Can not alloc domain group for node %d\n", i);
- continue;
}
sg->cpu_power = 0;
sg->cpumask = nodemask;
+ sg->next = sg;
cpus_or(covered, covered, nodemask);
prev = sg;
@@ -6017,15 +6059,15 @@ void build_sched_domains(const cpumask_t
if (!sg) {
printk(KERN_WARNING
"Can not alloc domain group for node %d\n", j);
- break;
+ goto error;
}
sg->cpu_power = 0;
sg->cpumask = tmp;
+ sg->next = prev->next;
cpus_or(covered, covered, tmp);
prev->next = sg;
prev = sg;
}
- prev->next = sched_group_nodes[i];
}
#endif
@@ -6088,13 +6130,22 @@ void build_sched_domains(const cpumask_t
* Tune cache-hot values:
*/
calibrate_migration_costs(cpu_map);
+
+ return 0;
+
+#ifdef CONFIG_NUMA
+error:
+ free_sched_groups(cpu_map);
+ return -ENOMEM;
+#endif
}
/*
* Set up scheduler domains and groups. Callers must hold the hotplug lock.
*/
-static void arch_init_sched_domains(const cpumask_t *cpu_map)
+static int arch_init_sched_domains(const cpumask_t *cpu_map)
{
cpumask_t cpu_default_map;
+ int err;
/*
* Setup mask for cpus without special case scheduling requirements.
@@ -6103,51 +6154,14 @@ static void arch_init_sched_domains(cons
*/
cpus_andnot(cpu_default_map, *cpu_map, cpu_isolated_map);
- build_sched_domains(&cpu_default_map);
+ err = build_sched_domains(&cpu_default_map);
+
+ return err;
}
static void arch_destroy_sched_domains(const cpumask_t *cpu_map)
{
-#ifdef CONFIG_NUMA
- int i;
- int cpu;
-
- for_each_cpu_mask(cpu, *cpu_map) {
- struct sched_group *sched_group_allnodes
- = sched_group_allnodes_bycpu[cpu];
- struct sched_group **sched_group_nodes
- = sched_group_nodes_bycpu[cpu];
-
- if (sched_group_allnodes) {
- kfree(sched_group_allnodes);
- sched_group_allnodes_bycpu[cpu] = NULL;
- }
-
- if (!sched_group_nodes)
- continue;
-
- for (i = 0; i < MAX_NUMNODES; i++) {
- cpumask_t nodemask = node_to_cpumask(i);
- struct sched_group *oldsg, *sg = sched_group_nodes[i];
-
- cpus_and(nodemask, nodemask, *cpu_map);
- if (cpus_empty(nodemask))
- continue;
-
- if (sg == NULL)
- continue;
- sg = sg->next;
-next_sg:
- oldsg = sg;
- sg = sg->next;
- kfree(oldsg);
- if (oldsg != sched_group_nodes[i])
- goto next_sg;
- }
- kfree(sched_group_nodes);
- sched_group_nodes_bycpu[cpu] = NULL;
- }
-#endif
+ free_sched_groups(cpu_map);
}
/*
@@ -6172,9 +6186,10 @@ static void detach_destroy_domains(const
* correct sched domains
* Call with hotplug lock held
*/
-void partition_sched_domains(cpumask_t *partition1, cpumask_t *partition2)
+int partition_sched_domains(cpumask_t *partition1, cpumask_t *partition2)
{
cpumask_t change_map;
+ int err = 0;
cpus_and(*partition1, *partition1, cpu_online_map);
cpus_and(*partition2, *partition2, cpu_online_map);
@@ -6183,9 +6198,11 @@ void partition_sched_domains(cpumask_t *
/* Detach sched domains from all of the affected cpus */
detach_destroy_domains(&change_map);
if (!cpus_empty(*partition1))
- build_sched_domains(partition1);
- if (!cpus_empty(*partition2))
- build_sched_domains(partition2);
+ err = build_sched_domains(partition1);
+ if (!err && !cpus_empty(*partition2))
+ err = build_sched_domains(partition2);
+
+ return err;
}
#ifdef CONFIG_HOTPLUG_CPU
_
Patches currently in -mm which might be from vatsa@xxxxxxxxxx are
origin.patch
-
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