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mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status

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Currently there's no easy way to get per-process usage of hugetlb pages,
which is inconvenient because userspace applications which use hugetlb
typically want to control their processes on the basis of how much memory
(including hugetlb) they use.  So this patch simply provides easy access
to the info via /proc/PID/status.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Joern Engel <joern@logfs.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2015-11-05 18:47:14 -08:00 • committed by Linus Torvalds
parent 25ee01a2fc
commit 5d317b2b65
6 changed files with 37 additions and 1 deletions
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9
mm/hugetlb.c
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@ -2790,6 +2790,12 @@ void hugetlb_show_meminfo(void)
1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
}
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
{
seq_printf(m, "HugetlbPages:\t%8lu kB\n",
atomic_long_read(&mm->hugetlb_usage) << (PAGE_SHIFT - 10));
}
/* Return the number pages of memory we physically have, in PAGE_SIZE units. */
unsigned long hugetlb_total_pages(void)
{
@ -3025,6 +3031,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
get_page(ptepage);
page_dup_rmap(ptepage);
set_huge_pte_at(dst, addr, dst_pte, entry);
hugetlb_count_add(pages_per_huge_page(h), dst);
}
spin_unlock(src_ptl);
spin_unlock(dst_ptl);
@ -3105,6 +3112,7 @@ again:
if (huge_pte_dirty(pte))
set_page_dirty(page);
hugetlb_count_sub(pages_per_huge_page(h), mm);
page_remove_rmap(page);
force_flush = !__tlb_remove_page(tlb, page);
if (force_flush) {
@ -3509,6 +3517,7 @@ retry:
&& (vma->vm_flags & VM_SHARED)));
set_huge_pte_at(mm, address, ptep, new_pte);
hugetlb_count_add(pages_per_huge_page(h), mm);
if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
/* Optimization, do the COW without a second fault */
ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl);