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Subject[PATCH 2/2] mm: rename global_page_state to global_zone_page_state
Date
From: Michal Hocko <mhocko@suse.com>

global_page_state is error prone as a recent bug report pointed out [1].
It only returns proper values for zone based counters as the enum it
gets suggests. We already have global_node_page_state so let's rename
global_page_state to global_zone_page_state to be more explicit here.
All existing users seems to be correct
$ git grep "global_page_state(NR_" | sed 's@.*(\(NR_[A-Z_]*\)).*@\1@' | sort | uniq -c
2 NR_BOUNCE
2 NR_FREE_CMA_PAGES
11 NR_FREE_PAGES
1 NR_KERNEL_STACK_KB
1 NR_MLOCK
2 NR_PAGETABLE

This patch shouldn't introduce any functional change.

[1] http://lkml.kernel.org/r/201707260628.v6Q6SmaS030814@www262.sakura.ne.jp

Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
fs/proc/meminfo.c | 10 +++++-----
include/linux/swap.h | 4 ++--
include/linux/vmstat.h | 4 ++--
mm/mmap.c | 6 +++---
mm/nommu.c | 4 ++--
mm/page-writeback.c | 4 ++--
mm/page_alloc.c | 12 ++++++------
mm/util.c | 2 +-
mm/vmstat.c | 4 ++--
9 files changed, 25 insertions(+), 25 deletions(-)

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 509a61668d90..cdd979724c74 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -80,7 +80,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "Active(file): ", pages[LRU_ACTIVE_FILE]);
show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
show_val_kb(m, "Unevictable: ", pages[LRU_UNEVICTABLE]);
- show_val_kb(m, "Mlocked: ", global_page_state(NR_MLOCK));
+ show_val_kb(m, "Mlocked: ", global_zone_page_state(NR_MLOCK));

#ifdef CONFIG_HIGHMEM
show_val_kb(m, "HighTotal: ", i.totalhigh);
@@ -114,9 +114,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "SUnreclaim: ",
global_node_page_state(NR_SLAB_UNRECLAIMABLE));
seq_printf(m, "KernelStack: %8lu kB\n",
- global_page_state(NR_KERNEL_STACK_KB));
+ global_zone_page_state(NR_KERNEL_STACK_KB));
show_val_kb(m, "PageTables: ",
- global_page_state(NR_PAGETABLE));
+ global_zone_page_state(NR_PAGETABLE));
#ifdef CONFIG_QUICKLIST
show_val_kb(m, "Quicklists: ", quicklist_total_size());
#endif
@@ -124,7 +124,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "NFS_Unstable: ",
global_node_page_state(NR_UNSTABLE_NFS));
show_val_kb(m, "Bounce: ",
- global_page_state(NR_BOUNCE));
+ global_zone_page_state(NR_BOUNCE));
show_val_kb(m, "WritebackTmp: ",
global_node_page_state(NR_WRITEBACK_TEMP));
show_val_kb(m, "CommitLimit: ", vm_commit_limit());
@@ -151,7 +151,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
#ifdef CONFIG_CMA
show_val_kb(m, "CmaTotal: ", totalcma_pages);
show_val_kb(m, "CmaFree: ",
- global_page_state(NR_FREE_CMA_PAGES));
+ global_zone_page_state(NR_FREE_CMA_PAGES));
#endif

hugetlb_report_meminfo(m);
diff --git a/include/linux/swap.h b/include/linux/swap.h
index d83d28e53e62..bf49b79218f4 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -262,8 +262,8 @@ extern unsigned long totalreserve_pages;
extern unsigned long nr_free_buffer_pages(void);
extern unsigned long nr_free_pagecache_pages(void);

-/* Definition of global_page_state not available yet */
-#define nr_free_pages() global_page_state(NR_FREE_PAGES)
+/* Definition of global_zone_page_state not available yet */
+#define nr_free_pages() global_zone_page_state(NR_FREE_PAGES)


/* linux/mm/swap.c */
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index b3d85f30d424..97e11ab573f0 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -123,7 +123,7 @@ static inline void node_page_state_add(long x, struct pglist_data *pgdat,
atomic_long_add(x, &vm_node_stat[item]);
}

-static inline unsigned long global_page_state(enum zone_stat_item item)
+static inline unsigned long global_zone_page_state(enum zone_stat_item item)
{
long x = atomic_long_read(&vm_zone_stat[item]);
#ifdef CONFIG_SMP
@@ -199,7 +199,7 @@ extern unsigned long sum_zone_node_page_state(int node,
extern unsigned long node_page_state(struct pglist_data *pgdat,
enum node_stat_item item);
#else
-#define sum_zone_node_page_state(node, item) global_page_state(item)
+#define sum_zone_node_page_state(node, item) global_zone_page_state(item)
#define node_page_state(node, item) global_node_page_state(item)
#endif /* CONFIG_NUMA */

diff --git a/mm/mmap.c b/mm/mmap.c
index f19efcf75418..9800e29763f4 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3514,7 +3514,7 @@ static int init_user_reserve(void)
{
unsigned long free_kbytes;

- free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+ free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);

sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17);
return 0;
@@ -3535,7 +3535,7 @@ static int init_admin_reserve(void)
{
unsigned long free_kbytes;

- free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+ free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);

sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13);
return 0;
@@ -3579,7 +3579,7 @@ static int reserve_mem_notifier(struct notifier_block *nb,

break;
case MEM_OFFLINE:
- free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+ free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);

if (sysctl_user_reserve_kbytes > free_kbytes) {
init_user_reserve();
diff --git a/mm/nommu.c b/mm/nommu.c
index fc184f597d59..53d5175a5c14 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1962,7 +1962,7 @@ static int __meminit init_user_reserve(void)
{
unsigned long free_kbytes;

- free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+ free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);

sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17);
return 0;
@@ -1983,7 +1983,7 @@ static int __meminit init_admin_reserve(void)
{
unsigned long free_kbytes;

- free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+ free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);

sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13);
return 0;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 96e93b214d31..88562a0feb14 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -363,7 +363,7 @@ static unsigned long global_dirtyable_memory(void)
{
unsigned long x;

- x = global_page_state(NR_FREE_PAGES);
+ x = global_zone_page_state(NR_FREE_PAGES);
/*
* Pages reserved for the kernel should not be considered
* dirtyable, to prevent a situation where reclaim has to
@@ -1405,7 +1405,7 @@ void wb_update_bandwidth(struct bdi_writeback *wb, unsigned long start_time)
* will look to see if it needs to start dirty throttling.
*
* If dirty_poll_interval is too low, big NUMA machines will call the expensive
- * global_page_state() too often. So scale it near-sqrt to the safety margin
+ * global_zone_page_state() too often. So scale it near-sqrt to the safety margin
* (the number of pages we may dirty without exceeding the dirty limits).
*/
static unsigned long dirty_poll_interval(unsigned long dirty,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3e89731a86bd..ff153f7a0586 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4443,7 +4443,7 @@ long si_mem_available(void)
* Estimate the amount of memory available for userspace allocations,
* without causing swapping.
*/
- available = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
+ available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages;

/*
* Not all the page cache can be freed, otherwise the system will
@@ -4472,7 +4472,7 @@ void si_meminfo(struct sysinfo *val)
{
val->totalram = totalram_pages;
val->sharedram = global_node_page_state(NR_SHMEM);
- val->freeram = global_page_state(NR_FREE_PAGES);
+ val->freeram = global_zone_page_state(NR_FREE_PAGES);
val->bufferram = nr_blockdev_pages();
val->totalhigh = totalhigh_pages;
val->freehigh = nr_free_highpages();
@@ -4607,11 +4607,11 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
global_node_page_state(NR_SLAB_UNRECLAIMABLE),
global_node_page_state(NR_FILE_MAPPED),
global_node_page_state(NR_SHMEM),
- global_page_state(NR_PAGETABLE),
- global_page_state(NR_BOUNCE),
- global_page_state(NR_FREE_PAGES),
+ global_zone_page_state(NR_PAGETABLE),
+ global_zone_page_state(NR_BOUNCE),
+ global_zone_page_state(NR_FREE_PAGES),
free_pcp,
- global_page_state(NR_FREE_CMA_PAGES));
+ global_zone_page_state(NR_FREE_CMA_PAGES));

for_each_online_pgdat(pgdat) {
if (show_mem_node_skip(filter, pgdat->node_id, nodemask))
diff --git a/mm/util.c b/mm/util.c
index 9ecddf568fe3..34e57fae959d 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -614,7 +614,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
return 0;

if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) {
- free = global_page_state(NR_FREE_PAGES);
+ free = global_zone_page_state(NR_FREE_PAGES);
free += global_node_page_state(NR_FILE_PAGES);

/*
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 9a4441bbeef2..4544d44e9594 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1500,7 +1500,7 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
if (!v)
return ERR_PTR(-ENOMEM);
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
- v[i] = global_page_state(i);
+ v[i] = global_zone_page_state(i);
v += NR_VM_ZONE_STAT_ITEMS;

for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
@@ -1589,7 +1589,7 @@ int vmstat_refresh(struct ctl_table *table, int write,
* which can equally be echo'ed to or cat'ted from (by root),
* can be used to update the stats just before reading them.
*
- * Oh, and since global_page_state() etc. are so careful to hide
+ * Oh, and since global_zone_page_state() etc. are so careful to hide
* transiently negative values, report an error here if any of
* the stats is negative, so we know to go looking for imbalance.
*/
--
2.13.3
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