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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2009-09-21 17:01:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:27 -0700
commitc6a7f5728a1db45d30df55a01adc130b4ab0327c (patch)
tree36649bc6ebb959841a5097c699968722cfd99c4d /kernel/fork.c
parent71de1ccbe1fb40203edd3beb473f8580d917d2ca (diff)
downloadop-kernel-dev-c6a7f5728a1db45d30df55a01adc130b4ab0327c.zip
op-kernel-dev-c6a7f5728a1db45d30df55a01adc130b4ab0327c.tar.gz
mm: oom analysis: Show kernel stack usage in /proc/meminfo and OOM log output
The amount of memory allocated to kernel stacks can become significant and cause OOM conditions. However, we do not display the amount of memory consumed by stacks. Add code to display the amount of memory used for stacks in /proc/meminfo. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 2cebfb2..d4638c8 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -136,9 +136,17 @@ struct kmem_cache *vm_area_cachep;
/* SLAB cache for mm_struct structures (tsk->mm) */
static struct kmem_cache *mm_cachep;
+static void account_kernel_stack(struct thread_info *ti, int account)
+{
+ struct zone *zone = page_zone(virt_to_page(ti));
+
+ mod_zone_page_state(zone, NR_KERNEL_STACK, account);
+}
+
void free_task(struct task_struct *tsk)
{
prop_local_destroy_single(&tsk->dirties);
+ account_kernel_stack(tsk->stack, -1);
free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
ftrace_graph_exit_task(tsk);
@@ -253,6 +261,9 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
tsk->btrace_seq = 0;
#endif
tsk->splice_pipe = NULL;
+
+ account_kernel_stack(ti, 1);
+
return tsk;
out:
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