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Subject[PATCH v2 6/6] mm/cma: remove per zone CMA stat
Date
From: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Now, all reserved pages for CMA region are belong to the ZONE_CMA
so we don't need to maintain CMA stat in other zones. Remove it.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
fs/proc/meminfo.c | 2 +-
include/linux/cma.h | 6 ++++++
include/linux/mmzone.h | 1 -
mm/cma.c | 15 +++++++++++++++
mm/page_alloc.c | 5 ++---
mm/vmstat.c | 1 -
6 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index ae5cc52..51449d0 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -172,7 +172,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
#endif
#ifdef CONFIG_CMA
, K(totalcma_pages)
- , K(global_page_state(NR_FREE_CMA_PAGES))
+ , K(cma_get_free())
#endif
);

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 29f9e77..816290c 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -28,4 +28,10 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
struct cma **res_cma);
extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align);
extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
+
+#ifdef CONFIG_CMA
+extern unsigned long cma_get_free(void);
+#else
+static inline unsigned long cma_get_free(void) { return 0; }
+#endif
#endif
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 75b41c5..3996a7c 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -140,7 +140,6 @@ enum zone_stat_item {
NR_SHMEM_HUGEPAGES, /* transparent shmem huge pages */
NR_SHMEM_PMDMAPPED, /* shmem huge pages currently mapped hugely */
NR_SHMEM_FREEHOLES, /* unused memory of high-order allocations */
- NR_FREE_CMA_PAGES,
NR_VM_ZONE_STAT_ITEMS };

/*
diff --git a/mm/cma.c b/mm/cma.c
index bd436e4..6dbddf2 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -54,6 +54,21 @@ unsigned long cma_get_size(const struct cma *cma)
return cma->count << PAGE_SHIFT;
}

+unsigned long cma_get_free(void)
+{
+ struct zone *zone;
+ unsigned long freecma = 0;
+
+ for_each_populated_zone(zone) {
+ if (!is_zone_cma(zone))
+ continue;
+
+ freecma += zone_page_state(zone, NR_FREE_PAGES);
+ }
+
+ return freecma;
+}
+
static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
int align_order)
{
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 51b2b0c..570edad 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -63,6 +63,7 @@
#include <linux/sched/rt.h>
#include <linux/page_owner.h>
#include <linux/kthread.h>
+#include <linux/cma.h>

#include <asm/sections.h>
#include <asm/tlbflush.h>
@@ -4107,7 +4108,7 @@ void show_free_areas(unsigned int filter)
global_page_state(NR_SHMEM_FREEHOLES),
global_page_state(NR_FREE_PAGES),
free_pcp,
- global_page_state(NR_FREE_CMA_PAGES));
+ cma_get_free());

for_each_populated_zone(zone) {
int i;
@@ -4150,7 +4151,6 @@ void show_free_areas(unsigned int filter)
" bounce:%lukB"
" free_pcp:%lukB"
" local_pcp:%ukB"
- " free_cma:%lukB"
" writeback_tmp:%lukB"
" pages_scanned:%lu"
" all_unreclaimable? %s"
@@ -4188,7 +4188,6 @@ void show_free_areas(unsigned int filter)
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)),
(!zone_reclaimable(zone) ? "yes" : "no")
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 39a0c3c..81acdae 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -766,7 +766,6 @@ const char * const vmstat_text[] = {
"nr_shmem_hugepages",
"nr_shmem_pmdmapped",
"nr_shmem_freeholes",
- "nr_free_cma",

/* enum writeback_stat_item counters */
"nr_dirty_threshold",
--
1.9.1
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