This makes show_mem() much less verbose at huge machines. Instead of
huge and almost useless dump of counters for each per-zone per-cpu
lists this patch prints sum of these counters for each zone (free_pcp)
and size of per-cpu list for current cpu (local_pcp).
Flag SHOW_MEM_PERCPU_LISTS reverts old verbose mode.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
---
include/linux/mm.h | 1 +
mm/page_alloc.c | 32 +++++++++++++++++++++++++-------
2 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 028565a..0538de0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1126,6 +1126,7 @@ extern void pagefault_out_of_memory(void);
* various contexts.
*/
#define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
+#define SHOW_MEM_PERCPU_LISTS (0x0002u) /* per-zone per-cpu */
extern void show_free_areas(unsigned int flags);
extern bool skip_free_areas_node(unsigned int flags, int nid);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a47f0b2..e591f3b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3198,20 +3198,29 @@ static void show_migration_types(unsigned char type)
*/
void show_free_areas(unsigned int filter)
{
+ unsigned long free_pcp = 0;
int cpu;
struct zone *zone;
for_each_populated_zone(zone) {
if (skip_free_areas_node(filter, zone_to_nid(zone)))
continue;
- show_node(zone);
- printk("%s per-cpu:\n", zone->name);
+
+ if (filter & SHOW_MEM_PERCPU_LISTS) {
+ show_node(zone);
+ printk("%s per-cpu:\n", zone->name);
+ }
for_each_online_cpu(cpu) {
struct per_cpu_pageset *pageset;
pageset = per_cpu_ptr(zone->pageset, cpu);
+ free_pcp += pageset->pcp.count;
+
+ if (!(filter & SHOW_MEM_PERCPU_LISTS))
+ continue;
+
printk("CPU %4d: hi:%5d, btch:%4d usd:%4d\n",
cpu, pageset->pcp.high,
pageset->pcp.batch, pageset->pcp.count);
@@ -3220,11 +3229,10 @@ void show_free_areas(unsigned int filter)
printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n"
" active_file:%lu inactive_file:%lu isolated_file:%lu\n"
- " unevictable:%lu"
- " dirty:%lu writeback:%lu unstable:%lu\n"
- " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
+ " unevictable:%lu dirty:%lu writeback:%lu unstable:%lu\n"
+ " slab_reclaimable:%lu slab_unreclaimable:%lu\n"
" mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n"
- " free_cma:%lu\n",
+ " free:%lu free_pcp:%lu free_cma:%lu\n",
global_page_state(NR_ACTIVE_ANON),
global_page_state(NR_INACTIVE_ANON),
global_page_state(NR_ISOLATED_ANON),
@@ -3235,13 +3243,14 @@ void show_free_areas(unsigned int filter)
global_page_state(NR_FILE_DIRTY),
global_page_state(NR_WRITEBACK),
global_page_state(NR_UNSTABLE_NFS),
- global_page_state(NR_FREE_PAGES),
global_page_state(NR_SLAB_RECLAIMABLE),
global_page_state(NR_SLAB_UNRECLAIMABLE),
global_page_state(NR_FILE_MAPPED),
global_page_state(NR_SHMEM),
global_page_state(NR_PAGETABLE),
global_page_state(NR_BOUNCE),
+ global_page_state(NR_FREE_PAGES),
+ free_pcp,
global_page_state(NR_FREE_CMA_PAGES));
for_each_populated_zone(zone) {
@@ -3249,6 +3258,11 @@ void show_free_areas(unsigned int filter)
if (skip_free_areas_node(filter, zone_to_nid(zone)))
continue;
+
+ free_pcp = 0;
+ for_each_online_cpu(cpu)
+ free_pcp += per_cpu_ptr(zone->pageset, cpu)->pcp.count;
+
show_node(zone);
printk("%s"
" free:%lukB"
@@ -3275,6 +3289,8 @@ void show_free_areas(unsigned int filter)
" pagetables:%lukB"
" unstable:%lukB"
" bounce:%lukB"
+ " free_pcp:%lukB"
+ " local_pcp:%ukB"
" free_cma:%lukB"
" writeback_tmp:%lukB"
" pages_scanned:%lu"
@@ -3306,6 +3322,8 @@ void show_free_areas(unsigned int filter)
K(zone_page_state(zone, NR_PAGETABLE)),
K(zone_page_state(zone, NR_UNSTABLE_NFS)),
K(zone_page_state(zone, NR_BOUNCE)),
+ K(free_pcp),
+ K(this_cpu_read(zone->pageset->pcp.count)),
K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
K(zone_page_state(zone, NR_PAGES_SCANNED)),
--
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