The patch titled
Subject: mm: hugetlb: proc: add HugetlbPages field to /proc/PID/smaps
has been added to the -mm tree. Its filename is
mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: mm: hugetlb: proc: add HugetlbPages field to /proc/PID/smaps
Currently /proc/PID/smaps provides no usage info for vma(VM_HUGETLB), which
is inconvenient when we want to know per-task or per-vma base hugetlb usage.
To solve this, this patch adds a new line for hugetlb usage like below:
Size: 20480 kB
Rss: 0 kB
Pss: 0 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 0 kB
Anonymous: 0 kB
AnonHugePages: 0 kB
HugetlbPages: 18432 kB
Swap: 0 kB
KernelPageSize: 2048 kB
MMUPageSize: 2048 kB
Locked: 0 kB
VmFlags: rd wr mr mw me de ht
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Jörn Engel <joern@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 32 ++++++++++++++++++---------
fs/proc/task_mmu.c | 29 ++++++++++++++++++++++++
2 files changed, 51 insertions(+), 10 deletions(-)
diff -puN Documentation/filesystems/proc.txt~mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps Documentation/filesystems/proc.txt
--- a/Documentation/filesystems/proc.txt~mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps
+++ a/Documentation/filesystems/proc.txt
@@ -423,6 +423,8 @@ Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 892 kB
Anonymous: 0 kB
+AnonHugePages: 0 kB
+HugetlbPages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
@@ -440,20 +442,30 @@ The "proportional set size" (PSS) of a p
in memory, where each page is divided by the number of processes sharing it.
So if a process has 1000 pages all to itself, and 1000 shared with one other
process, its PSS will be 1500.
+
Note that even a page which is part of a MAP_SHARED mapping, but has only
-a single pte mapped, i.e. is currently used by only one process, is accounted
-as private and not as shared.
+a single pte mapped, i.e. is currently used by only one process, is
+accounted as private and not as shared.
+
"Referenced" indicates the amount of memory currently marked as referenced or
accessed.
-"Anonymous" shows the amount of memory that does not belong to any file. Even
-a mapping associated with a file may contain anonymous pages: when MAP_PRIVATE
-and a page is modified, the file page is replaced by a private anonymous copy.
+
+"Anonymous" shows the amount of memory that does not belong to any file.
+Even a mapping associated with a file may contain anonymous pages: when
+MAP_PRIVATE and a page is modified, the file page is replaced by a private
+anonymous copy.
+
+"AnonHugePages" shows the ammount of memory backed by transparent hugepage.
+
+"HugetlbPages" shows the ammount of memory backed by hugetlbfs page.
+
"Swap" shows how much would-be-anonymous memory is also used, but out on
-swap.
-"SwapPss" shows proportional swap share of this mapping.
-"VmFlags" field deserves a separate description. This member represents the kernel
-flags associated with the particular virtual memory area in two letter encoded
-manner. The codes are the following:
+swap. SwapPss" shows proportional swap share of this mapping.
+
+"VmFlags" field deserves a separate description. This member represents
+the kernel flags associated with the particular virtual memory area in two
+letter encoded manner. The codes are the following:
+
rd - readable
wr - writeable
ex - executable
diff -puN fs/proc/task_mmu.c~mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps
+++ a/fs/proc/task_mmu.c
@@ -445,6 +445,7 @@ struct mem_size_stats {
unsigned long anonymous;
unsigned long anonymous_thp;
unsigned long swap;
+ unsigned long hugetlb;
u64 pss;
u64 swap_pss;
};
@@ -625,12 +626,38 @@ static void show_smap_vma_flags(struct s
seq_putc(m, '\n');
}
+#ifdef CONFIG_HUGETLB_PAGE
+static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end,
+ struct mm_walk *walk)
+{
+ struct mem_size_stats *mss = walk->private;
+ struct vm_area_struct *vma = walk->vma;
+ struct page *page = NULL;
+
+ if (pte_present(*pte)) {
+ page = vm_normal_page(vma, addr, *pte);
+ } else if (is_swap_pte(*pte)) {
+ swp_entry_t swpent = pte_to_swp_entry(*pte);
+
+ if (is_migration_entry(swpent))
+ page = migration_entry_to_page(swpent);
+ }
+ if (page)
+ mss->hugetlb += huge_page_size(hstate_vma(vma));
+ return 0;
+}
+#endif /* HUGETLB_PAGE */
+
static int show_smap(struct seq_file *m, void *v, int is_pid)
{
struct vm_area_struct *vma = v;
struct mem_size_stats mss;
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
+#ifdef CONFIG_HUGETLB_PAGE
+ .hugetlb_entry = smaps_hugetlb_range,
+#endif
.mm = vma->vm_mm,
.private = &mss,
};
@@ -652,6 +679,7 @@ static int show_smap(struct seq_file *m,
"Referenced: %8lu kB\n"
"Anonymous: %8lu kB\n"
"AnonHugePages: %8lu kB\n"
+ "HugetlbPages: %8lu kB\n"
"Swap: %8lu kB\n"
"SwapPss: %8lu kB\n"
"KernelPageSize: %8lu kB\n"
@@ -667,6 +695,7 @@ static int show_smap(struct seq_file *m,
mss.referenced >> 10,
mss.anonymous >> 10,
mss.anonymous_thp >> 10,
+ mss.hugetlb >> 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 n-horiguchi@xxxxxxxxxxxxx are
mm-hwpoison-fix-page-refcount-of-unkown-non-lru-page.patch
mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
mm-hwpoison-fix-panic-due-to-split-huge-zero-page.patch
mm-hwpoison-fix-panic-due-to-split-huge-zero-page-fix.patch
hugetlb-make-the-function-vma_shareable-bool.patch
pagemap-check-permissions-and-capabilities-at-open-time.patch
pagemap-switch-to-the-new-format-and-do-some-cleanup.patch
pagemap-rework-hugetlb-and-thp-report.patch
pagemap-hide-physical-addresses-from-non-privileged-users.patch
pagemap-add-mmap-exclusive-bit-for-marking-pages-mapped-only-here.patch
pagemap-update-documentation.patch
pagemap-update-documentation-fix.patch
mm-page_isolation-remove-bogus-tests-for-isolated-pages.patch
mm-rename-and-move-get-set_freepage_migratetype.patch
mm-hugetlb-add-cache-of-descriptors-to-resv_map-for-region_add.patch
mm-hugetlb-add-region_del-to-delete-a-specific-range-of-entries.patch
mm-hugetlb-expose-hugetlb-fault-mutex-for-use-by-fallocate.patch
hugetlbfs-hugetlb_vmtruncate_list-needs-to-take-a-range-to-delete.patch
hugetlbfs-truncate_hugepages-takes-a-range-of-pages.patch
mm-hugetlb-vma_has_reserves-needs-to-handle-fallocate-hole-punch.patch
mm-hugetlb-alloc_huge_page-handle-areas-hole-punched-by-fallocate.patch
hugetlbfs-new-huge_add_to_page_cache-helper-routine.patch
hugetlbfs-add-hugetlbfs_fallocate.patch
hugetlbfs-add-hugetlbfs_fallocate-fix.patch
mm-madvise-allow-remove-operation-for-hugetlbfs.patch
mempolicy-get-rid-of-duplicated-check-for-vmavm_pfnmap-in-queue_pages_range.patch
mm-page_isolation-make-set-unset_migratetype_isolate-file-local.patch
mm-compaction-more-robust-check-for-scanners-meeting.patch
mm-compaction-simplify-handling-restart-position-in-free-pages-scanner.patch
mm-compaction-encapsulate-resetting-cached-scanner-positions.patch
mm-compaction-always-skip-compound-pages-by-order-in-migrate-scanner.patch
mm-compaction-skip-compound-pages-by-order-in-free-scanner.patch
reverted-selftests-add-hugetlbfstest.patch
selftests-vm-point-to-libhugetlbfs-for-regression-testing.patch
documentation-update-libhugetlbfs-location-and-use-for-testing.patch
mm-hwpoison-fix-fail-to-split-thp-w-refcount-held.patch
mm-hwpoison-fix-pagehwpoison-test-set-race.patch
mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling.patch
mm-hwpoison-fix-refcount-of-thp-head-page-in-no-injection-case.patch
mm-hwpoison-replace-most-of-put_page-in-memory-error-handling-by-put_hwpoison_page.patch
mm-hwpoison-replace-most-of-put_page-in-memory-error-handling-by-put_hwpoison_page-fix.patch
mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-smaps.patch
mm-hugetlb-proc-add-hugetlbpages-field-to-proc-pid-status.patch
page-flags-trivial-cleanup-for-pagetrans-helpers.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages.patch
page-flags-define-pg_locked-behavior-on-compound-pages.patch
page-flags-define-behavior-of-fs-io-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-lru-related-flags-on-compound-pages.patch
page-flags-define-behavior-slb-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-xen-related-flags-on-compound-pages.patch
page-flags-define-pg_reserved-behavior-on-compound-pages.patch
page-flags-define-pg_swapbacked-behavior-on-compound-pages.patch
page-flags-define-pg_swapcache-behavior-on-compound-pages.patch
page-flags-define-pg_mlocked-behavior-on-compound-pages.patch
page-flags-define-pg_uncached-behavior-on-compound-pages.patch
page-flags-define-pg_uptodate-behavior-on-compound-pages.patch
page-flags-look-on-head-page-if-the-flag-is-encoded-in-page-mapping.patch
mm-sanitize-page-mapping-for-tail-pages.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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