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authorDavid Rientjes <rientjes@google.com>2013-04-29 15:07:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-29 15:54:35 -0700
commit949f7ec5760b021da3cccc1eaeb0671270e4238f (patch)
tree8610da7dff952d64cc59e8a922aa16fb430dd66e
parent1444f92c84984dd13f3e8e121115783ae5b22c55 (diff)
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mm, hugetlb: include hugepages in meminfo
Particularly in oom conditions, it's troublesome that hugetlb memory is not displayed. All other meminfo that is emitted will not add up to what is expected, and there is no artifact left in the kernel log to show that a potentially significant amount of memory is actually allocated as hugepages which are not available to be reclaimed. Booting with hugepages=8192 on the command line, this memory is now shown in oom conditions. For example, with echo m > /proc/sysrq-trigger: Node 0 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB Node 1 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB Node 2 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB Node 3 hugepages_total=2048 hugepages_free=2048 hugepages_surp=0 hugepages_size=2048kB [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/hugetlb.h4
-rw-r--r--mm/hugetlb.c15
-rw-r--r--mm/page_alloc.c3
3 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 16e4e9a643fb..3a62df310f2e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -58,6 +58,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(int, char *);
+void hugetlb_show_meminfo(void);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, unsigned int flags);
@@ -114,6 +115,9 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf) 0
+static inline void hugetlb_show_meminfo(void)
+{
+}
#define follow_huge_pmd(mm, addr, pmd, write) NULL
#define follow_huge_pud(mm, addr, pud, write) NULL
#define prepare_hugepage_range(file, addr, len) (-EINVAL)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 73b864a32017..9b9aeef8e590 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2121,6 +2121,21 @@ int hugetlb_report_node_meminfo(int nid, char *buf)
nid, h->surplus_huge_pages_node[nid]);
}
+void hugetlb_show_meminfo(void)
+{
+ struct hstate *h;
+ int nid;
+
+ for_each_node_state(nid, N_MEMORY)
+ for_each_hstate(h)
+ pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
+ nid,
+ h->nr_huge_pages_node[nid],
+ h->free_huge_pages_node[nid],
+ h->surplus_huge_pages_node[nid],
+ 1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
+}
+
/* Return the number pages of memory we physically have, in PAGE_SIZE units. */
unsigned long hugetlb_total_pages(void)
{
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 72da11c6804d..7350986bbf99 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -58,6 +58,7 @@
#include <linux/prefetch.h>
#include <linux/migrate.h>
#include <linux/page-debug-flags.h>
+#include <linux/hugetlb.h>
#include <linux/sched/rt.h>
#include <asm/tlbflush.h>
@@ -3113,6 +3114,8 @@ void show_free_areas(unsigned int filter)
printk("= %lukB\n", K(total));
}
+ hugetlb_show_meminfo();
+
printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES));
show_swap_cache_info();