The patch titled
Subject: mm: add ZONE_DEVICE statistics to smaps
has been added to the -mm tree. Its filename is
mm-add-zone_device-statistics-to-smaps.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-zone_device-statistics-to-smaps.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-zone_device-statistics-to-smaps.patch
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------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm: add ZONE_DEVICE statistics to smaps
ZONE_DEVICE pages are mapped into a process via the filesystem-dax and
device-dax mechanisms. There are also proposals to use ZONE_DEVICE pages
for other usages outside of dax. Add statistics to smaps so applications
can debug that they are obtaining the mappings they expect, or otherwise
accounting them.
Link: http://lkml.kernel.org/r/147881591739.39198.1358237993213024627.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff -puN fs/proc/task_mmu.c~mm-add-zone_device-statistics-to-smaps fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~mm-add-zone_device-statistics-to-smaps
+++ a/fs/proc/task_mmu.c
@@ -445,6 +445,8 @@ struct mem_size_stats {
unsigned long swap;
unsigned long shared_hugetlb;
unsigned long private_hugetlb;
+ unsigned long device;
+ unsigned long device_huge;
u64 pss;
u64 swap_pss;
bool check_shmem_swap;
@@ -458,6 +460,8 @@ static void smaps_account(struct mem_siz
if (PageAnon(page))
mss->anonymous += size;
+ else if (is_zone_device_page(page))
+ mss->device += size;
mss->resident += size;
/* Accumulate the size in pages that have been accessed. */
@@ -575,7 +579,7 @@ static void smaps_pmd_entry(pmd_t *pmd,
else if (PageSwapBacked(page))
mss->shmem_thp += HPAGE_PMD_SIZE;
else if (is_zone_device_page(page))
- /* pass */;
+ mss->device_huge += HPAGE_PMD_SIZE;
else
VM_BUG_ON_PAGE(1, page);
smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
@@ -774,6 +778,8 @@ static int show_smap(struct seq_file *m,
"ShmemPmdMapped: %8lu kB\n"
"Shared_Hugetlb: %8lu kB\n"
"Private_Hugetlb: %7lu kB\n"
+ "Device: %8lu kB\n"
+ "DeviceHugePages: %7lu kB\n"
"Swap: %8lu kB\n"
"SwapPss: %8lu kB\n"
"KernelPageSize: %8lu kB\n"
@@ -792,6 +798,8 @@ static int show_smap(struct seq_file *m,
mss.shmem_thp >> 10,
mss.shared_hugetlb >> 10,
mss.private_hugetlb >> 10,
+ mss.device >> 10,
+ mss.device_huge >> 10,
mss.swap >> 10,
(unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)),
vma_kernel_pagesize(vma) >> 10,
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
mm-disable-numa-migration-faults-for-dax-vmas.patch
mm-add-zone_device-statistics-to-smaps.patch
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