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Subject[PATCH 2/4] mm: proc/pid/smaps: factor out mem stats gathering
Date
To prepare for handling /proc/pid/smaps_rollup differently from /proc/pid/smaps
factor out vma mem stats gathering from show_smap() - it will be used by both.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
fs/proc/task_mmu.c | 55 ++++++++++++++++++++++++++--------------------
1 file changed, 31 insertions(+), 24 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index a3f98ca50981..d2ca88c92d9d 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -702,14 +702,9 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
}
#endif /* HUGETLB_PAGE */

-#define SEQ_PUT_DEC(str, val) \
- seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
-static int show_smap(struct seq_file *m, void *v)
+static void smap_gather_stats(struct vm_area_struct *vma,
+ struct mem_size_stats *mss)
{
- struct proc_maps_private *priv = m->private;
- struct vm_area_struct *vma = v;
- struct mem_size_stats mss_stack;
- struct mem_size_stats *mss;
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
#ifdef CONFIG_HUGETLB_PAGE
@@ -717,23 +712,6 @@ static int show_smap(struct seq_file *m, void *v)
#endif
.mm = vma->vm_mm,
};
- int ret = 0;
- bool rollup_mode;
- bool last_vma;
-
- if (priv->rollup) {
- rollup_mode = true;
- mss = priv->rollup;
- if (mss->first) {
- mss->first_vma_start = vma->vm_start;
- mss->first = false;
- }
- last_vma = !m_next_vma(priv, vma);
- } else {
- rollup_mode = false;
- memset(&mss_stack, 0, sizeof(mss_stack));
- mss = &mss_stack;
- }

smaps_walk.private = mss;

@@ -765,6 +743,35 @@ static int show_smap(struct seq_file *m, void *v)
walk_page_vma(vma, &smaps_walk);
if (vma->vm_flags & VM_LOCKED)
mss->pss_locked += mss->pss;
+}
+
+#define SEQ_PUT_DEC(str, val) \
+ seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
+static int show_smap(struct seq_file *m, void *v)
+{
+ struct proc_maps_private *priv = m->private;
+ struct vm_area_struct *vma = v;
+ struct mem_size_stats mss_stack;
+ struct mem_size_stats *mss;
+ int ret = 0;
+ bool rollup_mode;
+ bool last_vma;
+
+ if (priv->rollup) {
+ rollup_mode = true;
+ mss = priv->rollup;
+ if (mss->first) {
+ mss->first_vma_start = vma->vm_start;
+ mss->first = false;
+ }
+ last_vma = !m_next_vma(priv, vma);
+ } else {
+ rollup_mode = false;
+ memset(&mss_stack, 0, sizeof(mss_stack));
+ mss = &mss_stack;
+ }
+
+ smap_gather_stats(vma, mss);

if (!rollup_mode) {
show_map_vma(m, vma);
--
2.18.0
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