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authorYang Shi <yang.shi@linux.alibaba.com>2018-08-17 15:44:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-17 16:20:28 -0700
commitfadae2953072e9005c5f1d64e1049edb043494dc (patch)
tree11915df568a18c7b814b80778abfb7b8ece15271
parent720e14ebec642bc56c44e5e60a2d595900e5bbf0 (diff)
thp: use mm_file_counter to determine update which rss counter
Since commit eca56ff906bd ("mm, shmem: add internal shmem resident memory accounting"), MM_SHMEMPAGES is added to separate the shmem accounting from regular files. So, all shmem pages should be accounted to MM_SHMEMPAGES instead of MM_FILEPAGES. And, normal 4K shmem pages have been accounted to MM_SHMEMPAGES, so shmem thp pages should be not treated differently. Account them to MM_SHMEMPAGES via mm_counter_file() since shmem pages are swap backed to keep consistent with normal 4K shmem pages. This will not change the rss counter of processes since shmem pages are still a part of it. The /proc/pid/status and /proc/pid/statm counters will however be more accurate wrt shmem usage, as originally intended. And as eca56ff906bd ("mm, shmem: add internal shmem resident memory accounting") mentioned, oom also could report more accurate "shmem-rss". Link: http://lkml.kernel.org/r/1529442518-17398-1-git-send-email-yang.shi@linux.alibaba.com Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/huge_memory.c4
-rw-r--r--mm/memory.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 1ce44e87f494..064a9d78879d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1740,7 +1740,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
} else {
if (arch_needs_pgtable_deposit())
zap_deposited_table(tlb->mm, pmd);
- add_mm_counter(tlb->mm, MM_FILEPAGES, -HPAGE_PMD_NR);
+ add_mm_counter(tlb->mm, mm_counter_file(page), -HPAGE_PMD_NR);
}
spin_unlock(ptl);
@@ -2090,7 +2090,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
SetPageReferenced(page);
page_remove_rmap(page, true);
put_page(page);
- add_mm_counter(mm, MM_FILEPAGES, -HPAGE_PMD_NR);
+ add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR);
return;
} else if (is_huge_zero_pmd(*pmd)) {
/*
diff --git a/mm/memory.c b/mm/memory.c
index 7c3bd119fcca..d7b5b22a1a0a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3400,7 +3400,7 @@ static int do_set_pmd(struct vm_fault *vmf, struct page *page)
if (write)
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
- add_mm_counter(vma->vm_mm, MM_FILEPAGES, HPAGE_PMD_NR);
+ add_mm_counter(vma->vm_mm, mm_counter_file(page), HPAGE_PMD_NR);
page_add_file_rmap(page, true);
/*
* deposit and withdraw with pmd lock held