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authorRoman Gushchin <guro@fb.com>2018-02-01 03:16:22 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-01 04:18:36 +0300
commitfcb2b0c577f145c7616843c9d4dcb4f9e5d88e29 (patch)
treee5e0adca3b30b9d2eac5cec139a9b588844766c8 /mm/hugetlb.c
parent9852a7212324fd25f896932f4f4607ce47b0a22f (diff)
downloadlinux-fcb2b0c577f145c7616843c9d4dcb4f9e5d88e29.tar.xz
mm: show total hugetlb memory consumption in /proc/meminfo
Currently we display some hugepage statistics (total, free, etc) in /proc/meminfo, but only for default hugepage size (e.g. 2Mb). If hugepages of different sizes are used (like 2Mb and 1Gb on x86-64), /proc/meminfo output can be confusing, as non-default sized hugepages are not reflected at all, and there are no signs that they are existing and consuming system memory. To solve this problem, let's display the total amount of memory, consumed by hugetlb pages of all sized (both free and used). Let's call it "Hugetlb", and display size in kB to match generic /proc/meminfo style. For example, (1024 2Mb pages and 2 1Gb pages are pre-allocated): $ cat /proc/meminfo MemTotal: 8168984 kB MemFree: 3789276 kB <...> CmaFree: 0 kB HugePages_Total: 1024 HugePages_Free: 1024 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB Hugetlb: 4194304 kB DirectMap4k: 32632 kB DirectMap2M: 4161536 kB DirectMap1G: 6291456 kB Also, this patch updates corresponding docs to reflect Hugetlb entry meaning and difference between Hugetlb and HugePages_Total * Hugepagesize. Link: http://lkml.kernel.org/r/20171115231409.12131-1-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David Rientjes <rientjes@google.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c36
1 files changed, 24 insertions, 12 deletions
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)