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authorRik van Riel <riel@redhat.com>2013-10-07 11:29:28 +0100
committerIngo Molnar <mingo@kernel.org>2013-10-09 14:48:00 +0200
commit82727018b0d33d188e9916bcf76f18387484cb04 (patch)
tree429e0db98c4512f714a668ae9ef9d3bb6e85ce0f
parent83e1d2cd9eabec5164afea295ff06b941ae8e4a9 (diff)
downloadlinux-82727018b0d33d188e9916bcf76f18387484cb04.tar.gz
sched/numa: Call task_numa_free() from do_execve()
It is possible for a task in a numa group to call exec, and have the new (unrelated) executable inherit the numa group association from its former self. This has the potential to break numa grouping, and is trivial to fix. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1381141781-10992-51-git-send-email-mgorman@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--fs/exec.c1
-rw-r--r--include/linux/sched.h4
-rw-r--r--kernel/sched/fair.c9
-rw-r--r--kernel/sched/sched.h5
4 files changed, 13 insertions, 6 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 8875dd10ae7..2ea437e5acf 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1547,6 +1547,7 @@ static int do_execve_common(const char *filename,
current->fs->in_exec = 0;
current->in_execve = 0;
acct_update_integrals(current);
+ task_numa_free(current);
free_bprm(bprm);
if (displaced)
put_files_struct(displaced);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 724482200b8..f6385107c35 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1458,6 +1458,7 @@ struct task_struct {
extern void task_numa_fault(int last_node, int node, int pages, int flags);
extern pid_t task_numa_group_id(struct task_struct *p);
extern void set_numabalancing_state(bool enabled);
+extern void task_numa_free(struct task_struct *p);
#else
static inline void task_numa_fault(int last_node, int node, int pages,
int flags)
@@ -1470,6 +1471,9 @@ static inline pid_t task_numa_group_id(struct task_struct *p)
static inline void set_numabalancing_state(bool enabled)
{
}
+static inline void task_numa_free(struct task_struct *p)
+{
+}
#endif
static inline struct pid *task_pid(struct task_struct *task)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4c40e13310e..c4df2de6ca4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1418,6 +1418,7 @@ void task_numa_free(struct task_struct *p)
{
struct numa_group *grp = p->numa_group;
int i;
+ void *numa_faults = p->numa_faults;
if (grp) {
for (i = 0; i < 2*nr_node_ids; i++)
@@ -1433,7 +1434,9 @@ void task_numa_free(struct task_struct *p)
put_numa_group(grp);
}
- kfree(p->numa_faults);
+ p->numa_faults = NULL;
+ p->numa_faults_buffer = NULL;
+ kfree(numa_faults);
}
/*
@@ -1452,6 +1455,10 @@ void task_numa_fault(int last_cpupid, int node, int pages, int flags)
if (!p->mm)
return;
+ /* Do not worry about placement if exiting */
+ if (p->state == TASK_DEAD)
+ return;
+
/* Allocate buffer to track faults on a per-node basis */
if (unlikely(!p->numa_faults)) {
int size = sizeof(*p->numa_faults) * 2 * nr_node_ids;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 8037b10a256..eeb1923812a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -559,11 +559,6 @@ static inline u64 rq_clock_task(struct rq *rq)
#ifdef CONFIG_NUMA_BALANCING
extern int migrate_task_to(struct task_struct *p, int cpu);
extern int migrate_swap(struct task_struct *, struct task_struct *);
-extern void task_numa_free(struct task_struct *p);
-#else /* CONFIG_NUMA_BALANCING */
-static inline void task_numa_free(struct task_struct *p)
-{
-}
#endif /* CONFIG_NUMA_BALANCING */
#ifdef CONFIG_SMP