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authorRafael Aquini <aquini@redhat.com>2014-08-06 16:06:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:19 -0700
commitcc7452b6dca384400960d40090a98d0eb920ab22 (patch)
treea87ea435e22a09630d1d74c30052744414359095
parent82f71ae4a2b829a25971bdf54b4d0d3d69d3c8b7 (diff)
mm: export NR_SHMEM via sysinfo(2) / si_meminfo() interfaces
Historically, we exported shared pages to userspace via sysinfo(2) sharedram and /proc/meminfo's "MemShared" fields. With the advent of tmpfs, from kernel v2.4 onward, that old way for accounting shared mem was deemed inaccurate and we started to export a hard-coded 0 for sysinfo.sharedram. Later on, during the 2.6 timeframe, "MemShared" got re-introduced to /proc/meminfo re-branded as "Shmem", but we're still reporting sysinfo.sharedmem as that old hard-coded zero, which makes the "shared memory" report inconsistent across interfaces. This patch leverages the addition of explicit accounting for pages used by shmem/tmpfs -- "4b02108 mm: oom analysis: add shmem vmstat" -- in order to make the users of sysinfo(2) and si_meminfo*() friends aware of that vmstat entry and make them report it consistently across the interfaces, as well to make sysinfo(2) returned data consistent with our current API documentation states. Signed-off-by: Rafael Aquini <aquini@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/base/node.c2
-rw-r--r--fs/proc/meminfo.c2
-rw-r--r--mm/page_alloc.c3
3 files changed, 4 insertions, 3 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 8f7ed9933a7c..c6d3ae05f1ca 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -126,7 +126,7 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(node_page_state(nid, NR_FILE_PAGES)),
nid, K(node_page_state(nid, NR_FILE_MAPPED)),
nid, K(node_page_state(nid, NR_ANON_PAGES)),
- nid, K(node_page_state(nid, NR_SHMEM)),
+ nid, K(i.sharedram),
nid, node_page_state(nid, NR_KERNEL_STACK) *
THREAD_SIZE / 1024,
nid, K(node_page_state(nid, NR_PAGETABLE)),
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 7445af0b1aa3..aa1eee06420f 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -168,7 +168,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
K(global_page_state(NR_WRITEBACK)),
K(global_page_state(NR_ANON_PAGES)),
K(global_page_state(NR_FILE_MAPPED)),
- K(global_page_state(NR_SHMEM)),
+ K(i.sharedram),
K(global_page_state(NR_SLAB_RECLAIMABLE) +
global_page_state(NR_SLAB_UNRECLAIMABLE)),
K(global_page_state(NR_SLAB_RECLAIMABLE)),
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c1c6cb78e5ca..0987ac9f0a4e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3047,7 +3047,7 @@ static inline void show_node(struct zone *zone)
void si_meminfo(struct sysinfo *val)
{
val->totalram = totalram_pages;
- val->sharedram = 0;
+ val->sharedram = global_page_state(NR_SHMEM);
val->freeram = global_page_state(NR_FREE_PAGES);
val->bufferram = nr_blockdev_pages();
val->totalhigh = totalhigh_pages;
@@ -3067,6 +3067,7 @@ void si_meminfo_node(struct sysinfo *val, int nid)
for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
managed_pages += pgdat->node_zones[zone_type].managed_pages;
val->totalram = managed_pages;
+ val->sharedram = node_page_state(nid, NR_SHMEM);
val->freeram = node_page_state(nid, NR_FREE_PAGES);
#ifdef CONFIG_HIGHMEM
val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;