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Subject[PATCH v2] Show kernel stack usage to /proc/meminfo and OOM log
Date
Subject: [PATCH] Show kernel stack usage to /proc/meminfo and OOM log

if the system have a lot of thread, kernel stack consume unignorable large size
memory.
IOW, it make a lot of unaccountable memory.

Tons unaccountable memory bring to harder analyse memory related trouble.

Then, kernel stack account is useful.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
fs/proc/meminfo.c | 2 ++
include/linux/mmzone.h | 3 ++-
kernel/fork.c | 12 ++++++++++++
mm/page_alloc.c | 6 ++++--
mm/vmstat.c | 1 +
5 files changed, 21 insertions(+), 3 deletions(-)

Index: b/fs/proc/meminfo.c
===================================================================
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -85,6 +85,7 @@ static int meminfo_proc_show(struct seq_
"SReclaimable: %8lu kB\n"
"SUnreclaim: %8lu kB\n"
"PageTables: %8lu kB\n"
+ "KernelStack %8lu kB\n"
#ifdef CONFIG_QUICKLIST
"Quicklists: %8lu kB\n"
#endif
@@ -129,6 +130,7 @@ static int meminfo_proc_show(struct seq_
K(global_page_state(NR_SLAB_RECLAIMABLE)),
K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
K(global_page_state(NR_PAGETABLE)),
+ K(global_page_state(NR_KERNEL_STACK)),
#ifdef CONFIG_QUICKLIST
K(quicklist_total_size()),
#endif
Index: b/include/linux/mmzone.h
===================================================================
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -94,10 +94,11 @@ enum zone_stat_item {
NR_SLAB_RECLAIMABLE,
NR_SLAB_UNRECLAIMABLE,
NR_PAGETABLE, /* used for pagetables */
+ NR_KERNEL_STACK,
+ /* Second 128 byte cacheline */
NR_UNSTABLE_NFS, /* NFS unstable pages */
NR_BOUNCE,
NR_VMSCAN_WRITE,
- /* Second 128 byte cacheline */
NR_WRITEBACK_TEMP, /* Writeback using temporary buffers */
#ifdef CONFIG_NUMA
NUMA_HIT, /* allocated in intended node */
Index: b/kernel/fork.c
===================================================================
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -137,9 +137,18 @@ 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 on)
+{
+ struct zone *zone = page_zone(virt_to_page(ti));
+ int pages = THREAD_SIZE / PAGE_SIZE;
+
+ mod_zone_page_state(zone, NR_KERNEL_STACK, on ? pages : -pages);
+}
+
void free_task(struct task_struct *tsk)
{
prop_local_destroy_single(&tsk->dirties);
+ account_kernel_stack(tsk->stack, 0);
free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
ftrace_graph_exit_task(tsk);
@@ -255,6 +264,9 @@ static struct task_struct *dup_task_stru
tsk->btrace_seq = 0;
#endif
tsk->splice_pipe = NULL;
+
+ account_kernel_stack(ti, 1);
+
return tsk;

out:
Index: b/mm/page_alloc.c
===================================================================
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2119,7 +2119,8 @@ void show_free_areas(void)
" inactive_file:%lu"
" unevictable:%lu"
" dirty:%lu writeback:%lu unstable:%lu\n"
- " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
+ " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n"
+ " kernel_stack:%lu\n",
global_page_state(NR_ACTIVE_ANON),
global_page_state(NR_ACTIVE_FILE),
global_page_state(NR_INACTIVE_ANON),
@@ -2133,7 +2134,8 @@ void show_free_areas(void)
global_page_state(NR_SLAB_UNRECLAIMABLE),
global_page_state(NR_FILE_MAPPED),
global_page_state(NR_PAGETABLE),
- global_page_state(NR_BOUNCE));
+ global_page_state(NR_BOUNCE),
+ global_page_state(NR_KERNEL_STACK));

for_each_populated_zone(zone) {
int i;
Index: b/mm/vmstat.c
===================================================================
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -639,6 +639,7 @@ static const char * const vmstat_text[]
"nr_slab_reclaimable",
"nr_slab_unreclaimable",
"nr_page_table_pages",
+ "nr_kernel_stack",
"nr_unstable",
"nr_bounce",
"nr_vmscan_write",



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