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-rw-r--r--Documentation/vm/hugetlbpage.txt27
-rw-r--r--mm/hugetlb.c36
2 files changed, 42 insertions, 21 deletions
diff --git a/Documentation/vm/hugetlbpage.txt b/Documentation/vm/hugetlbpage.txt
index 59cbc803aad6..faf077d50d42 100644
--- a/Documentation/vm/hugetlbpage.txt
+++ b/Documentation/vm/hugetlbpage.txt
@@ -20,19 +20,20 @@ options.
The /proc/meminfo file provides information about the total number of
persistent hugetlb pages in the kernel's huge page pool. It also displays
-information about the number of free, reserved and surplus huge pages and the
-default huge page size. The huge page size is needed for generating the
-proper alignment and size of the arguments to system calls that map huge page
-regions.
+default huge page size and information about the number of free, reserved
+and surplus huge pages in the pool of huge pages of default size.
+The huge page size is needed for generating the proper alignment and
+size of the arguments to system calls that map huge page regions.
The output of "cat /proc/meminfo" will include lines like:
.....
-HugePages_Total: vvv
-HugePages_Free: www
-HugePages_Rsvd: xxx
-HugePages_Surp: yyy
-Hugepagesize: zzz kB
+HugePages_Total: uuu
+HugePages_Free: vvv
+HugePages_Rsvd: www
+HugePages_Surp: xxx
+Hugepagesize: yyy kB
+Hugetlb: zzz kB
where:
HugePages_Total is the size of the pool of huge pages.
@@ -47,6 +48,14 @@ HugePages_Surp is short for "surplus," and is the number of huge pages in
the pool above the value in /proc/sys/vm/nr_hugepages. The
maximum number of surplus huge pages is controlled by
/proc/sys/vm/nr_overcommit_hugepages.
+Hugepagesize is the default hugepage size (in Kb).
+Hugetlb is the total amount of memory (in kB), consumed by huge
+ pages of all sizes.
+ If huge pages of different sizes are in use, this number
+ will exceed HugePages_Total * Hugepagesize. To get more
+ detailed information, please, refer to
+ /sys/kernel/mm/hugepages (described below).
+
/proc/filesystems should also show a filesystem of type "hugetlbfs" configured
in the kernel.
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9a334f5fb730..1e6a5ad0d420 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2975,20 +2975,32 @@ out:
void hugetlb_report_meminfo(struct seq_file *m)
{
- struct hstate *h = &default_hstate;
+ struct hstate *h;
+ unsigned long total = 0;
+
if (!hugepages_supported())
return;
- seq_printf(m,
- "HugePages_Total: %5lu\n"
- "HugePages_Free: %5lu\n"
- "HugePages_Rsvd: %5lu\n"
- "HugePages_Surp: %5lu\n"
- "Hugepagesize: %8lu kB\n",
- h->nr_huge_pages,
- h->free_huge_pages,
- h->resv_huge_pages,
- h->surplus_huge_pages,
- 1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
+
+ for_each_hstate(h) {
+ unsigned long count = h->nr_huge_pages;
+
+ total += (PAGE_SIZE << huge_page_order(h)) * count;
+
+ if (h == &default_hstate)
+ seq_printf(m,
+ "HugePages_Total: %5lu\n"
+ "HugePages_Free: %5lu\n"
+ "HugePages_Rsvd: %5lu\n"
+ "HugePages_Surp: %5lu\n"
+ "Hugepagesize: %8lu kB\n",
+ count,
+ h->free_huge_pages,
+ h->resv_huge_pages,
+ h->surplus_huge_pages,
+ (PAGE_SIZE << huge_page_order(h)) / 1024);
+ }
+
+ seq_printf(m, "Hugetlb: %8lu kB\n", total / 1024);
}
int hugetlb_report_node_meminfo(int nid, char *buf)