The patch titled
Subject: mm: proc: smaps_rollup: fix pss_locked calculation
has been added to the -mm tree. Its filename is
mm-proc-smaps_rollup-fix-pss_locked-calculation.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-proc-smaps_rollup-fix-pss_locked-calculation.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-proc-smaps_rollup-fix-pss_locked-calculation.patch
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------------------------------------------------------
From: Sandeep Patil <sspatil@xxxxxxxxxxx>
Subject: mm: proc: smaps_rollup: fix pss_locked calculation
The 'pss_locked' field of smaps_rollup was being calculated incorrectly.
It accumulated the current pss everytime a locked VMA was found. Fix that
by adding to 'pss_locked' the same time as that of 'pss' if the vma being
walked is locked.
Link: http://lkml.kernel.org/r/20190203065425.14650-1-sspatil@xxxxxxxxxxx
Fixes: 493b0e9d945f ("mm: add /proc/pid/smaps_rollup")
Signed-off-by: Sandeep Patil <sspatil@xxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Daniel Colascione <dancol@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.14.x, 4.19.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
--- a/fs/proc/task_mmu.c~mm-proc-smaps_rollup-fix-pss_locked-calculation
+++ a/fs/proc/task_mmu.c
@@ -423,7 +423,7 @@ struct mem_size_stats {
};
static void smaps_account(struct mem_size_stats *mss, struct page *page,
- bool compound, bool young, bool dirty)
+ bool compound, bool young, bool dirty, bool locked)
{
int i, nr = compound ? 1 << compound_order(page) : 1;
unsigned long size = nr * PAGE_SIZE;
@@ -450,24 +450,31 @@ static void smaps_account(struct mem_siz
else
mss->private_clean += size;
mss->pss += (u64)size << PSS_SHIFT;
+ if (locked)
+ mss->pss_locked += (u64)size << PSS_SHIFT;
return;
}
for (i = 0; i < nr; i++, page++) {
int mapcount = page_mapcount(page);
+ unsigned long pss = (PAGE_SIZE << PSS_SHIFT);
if (mapcount >= 2) {
if (dirty || PageDirty(page))
mss->shared_dirty += PAGE_SIZE;
else
mss->shared_clean += PAGE_SIZE;
- mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
+ mss->pss += pss / mapcount;
+ if (locked)
+ mss->pss_locked += pss / mapcount;
} else {
if (dirty || PageDirty(page))
mss->private_dirty += PAGE_SIZE;
else
mss->private_clean += PAGE_SIZE;
- mss->pss += PAGE_SIZE << PSS_SHIFT;
+ mss->pss += pss;
+ if (locked)
+ mss->pss_locked += pss;
}
}
}
@@ -490,6 +497,7 @@ static void smaps_pte_entry(pte_t *pte,
{
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = walk->vma;
+ bool locked = !!(vma->vm_flags & VM_LOCKED);
struct page *page = NULL;
if (pte_present(*pte)) {
@@ -532,7 +540,7 @@ static void smaps_pte_entry(pte_t *pte,
if (!page)
return;
- smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte));
+ smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte), locked);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -541,6 +549,7 @@ static void smaps_pmd_entry(pmd_t *pmd,
{
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = walk->vma;
+ bool locked = !!(vma->vm_flags & VM_LOCKED);
struct page *page;
/* FOLL_DUMP will return -EFAULT on huge zero page */
@@ -555,7 +564,7 @@ static void smaps_pmd_entry(pmd_t *pmd,
/* pass */;
else
VM_BUG_ON_PAGE(1, page);
- smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
+ smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), locked);
}
#else
static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
@@ -737,11 +746,8 @@ static void smap_gather_stats(struct vm_
}
}
#endif
-
/* mmap_sem is held in m_start */
walk_page_vma(vma, &smaps_walk);
- if (vma->vm_flags & VM_LOCKED)
- mss->pss_locked += mss->pss;
}
#define SEQ_PUT_DEC(str, val) \
_
Patches currently in -mm which might be from sspatil@xxxxxxxxxxx are
mm-proc-smaps_rollup-fix-pss_locked-calculation.patch
