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Commit c41f012a authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
Browse files

mm: rename global_page_state to global_zone_page_state 

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

Link: http://lkml.kernel.org/r/20170801134256.5400-2-hannes@cmpxchg.org


Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4da243ac

fs/proc/meminfo.c

+5 −5
Original line number Diff line number Diff line
@@ -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);

include/linux/swap.h

+2 −2
Original line number Diff line number Diff line
@@ -263,8 +263,8 @@ 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 */

include/linux/vmstat.h

+2 −2
Original line number Diff line number Diff line
@@ -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 */

mm/mmap.c

+3 −3
Original line number Diff line number Diff line
@@ -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();

mm/nommu.c

+2 −2
Original line number Diff line number Diff line
@@ -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;