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Subject[PATCH 6/8] mm: proc: move show_numa_map() to fs/proc/task_mmu.c
Date
Moving show_numa_map() from mempolicy.c to task_mmu.c solves several
issues.

- Having the show() operation "miles away" from the corresponding
seq_file iteration operations is a maintenance burden.

- The need to export ad hoc info like struct proc_maps_private is
eliminated.

- The implementation of show_numa_map() can be improved in a simple
manner by cooperating with the other seq_file operations (start,
stop, etc) -- something that would be messy to do without this
change.

Signed-off-by: Stephen Wilson <wilsons@start.ca>
---
fs/proc/task_mmu.c | 170 +++++++++++++++++++++++++++++++++++++++++++++++++++-
mm/mempolicy.c | 168 ---------------------------------------------------
2 files changed, 168 insertions(+), 170 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 2e7addf..9f069d2 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -856,8 +856,174 @@ const struct file_operations proc_pagemap_operations = {
#endif /* CONFIG_PROC_PAGE_MONITOR */

#ifdef CONFIG_NUMA
-extern int show_numa_map(struct seq_file *m, void *v);

+struct numa_maps {
+ unsigned long pages;
+ unsigned long anon;
+ unsigned long active;
+ unsigned long writeback;
+ unsigned long mapcount_max;
+ unsigned long dirty;
+ unsigned long swapcache;
+ unsigned long node[MAX_NUMNODES];
+};
+
+static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty)
+{
+ int count = page_mapcount(page);
+
+ md->pages++;
+ if (pte_dirty || PageDirty(page))
+ md->dirty++;
+
+ if (PageSwapCache(page))
+ md->swapcache++;
+
+ if (PageActive(page) || PageUnevictable(page))
+ md->active++;
+
+ if (PageWriteback(page))
+ md->writeback++;
+
+ if (PageAnon(page))
+ md->anon++;
+
+ if (count > md->mapcount_max)
+ md->mapcount_max = count;
+
+ md->node[page_to_nid(page)]++;
+}
+
+static int gather_pte_stats(pte_t *pte, unsigned long addr,
+ unsigned long pte_size, struct mm_walk *walk)
+{
+ struct numa_maps *md;
+ struct page *page;
+ int nid;
+
+ if (pte_none(*pte))
+ return 0;
+
+ page = pte_page(*pte);
+ if (!page)
+ return 0;
+
+ nid = page_to_nid(page);
+ if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
+ return 0;
+
+ md = walk->private;
+ gather_stats(page, md, pte_dirty(*pte));
+ return 0;
+}
+
+#ifdef CONFIG_HUGETLB_PAGE
+static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end, struct mm_walk *walk)
+{
+ struct numa_maps *md;
+ struct page *page;
+
+ if (pte_none(*pte))
+ return 0;
+
+ page = pte_page(*pte);
+ if (!page)
+ return 0;
+
+ md = walk->private;
+ gather_stats(page, md, pte_dirty(*pte));
+ return 0;
+}
+
+#else
+static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end, struct mm_walk *walk)
+{
+ return 0;
+}
+#endif
+
+/*
+ * Display pages allocated per node and memory policy via /proc.
+ */
+static int show_numa_map(struct seq_file *m, void *v)
+{
+ struct proc_maps_private *priv = m->private;
+ struct vm_area_struct *vma = v;
+ struct numa_maps *md;
+ struct file *file = vma->vm_file;
+ struct mm_struct *mm = vma->vm_mm;
+ struct mm_walk walk = {};
+ struct mempolicy *pol;
+ int n;
+ char buffer[50];
+
+ if (!mm)
+ return 0;
+
+ md = kzalloc(sizeof(struct numa_maps), GFP_KERNEL);
+ if (!md)
+ return 0;
+
+ walk.hugetlb_entry = gather_hugetbl_stats;
+ walk.pte_entry = gather_pte_stats;
+ walk.private = md;
+ walk.mm = mm;
+
+ pol = get_vma_policy(priv->task, vma, vma->vm_start);
+ mpol_to_str(buffer, sizeof(buffer), pol, 0);
+ mpol_cond_put(pol);
+
+ seq_printf(m, "%08lx %s", vma->vm_start, buffer);
+
+ if (file) {
+ seq_printf(m, " file=");
+ seq_path(m, &file->f_path, "\n\t= ");
+ } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
+ seq_printf(m, " heap");
+ } else if (vma->vm_start <= mm->start_stack &&
+ vma->vm_end >= mm->start_stack) {
+ seq_printf(m, " stack");
+ }
+
+ walk_page_range(vma->vm_start, vma->vm_end, &walk);
+
+ if (!md->pages)
+ goto out;
+
+ if (md->anon)
+ seq_printf(m, " anon=%lu", md->anon);
+
+ if (md->dirty)
+ seq_printf(m, " dirty=%lu", md->dirty);
+
+ if (md->pages != md->anon && md->pages != md->dirty)
+ seq_printf(m, " mapped=%lu", md->pages);
+
+ if (md->mapcount_max > 1)
+ seq_printf(m, " mapmax=%lu", md->mapcount_max);
+
+ if (md->swapcache)
+ seq_printf(m, " swapcache=%lu", md->swapcache);
+
+ if (md->active < md->pages && !is_vm_hugetlb_page(vma))
+ seq_printf(m, " active=%lu", md->active);
+
+ if (md->writeback)
+ seq_printf(m, " writeback=%lu", md->writeback);
+
+ for_each_node_state(n, N_HIGH_MEMORY)
+ if (md->node[n])
+ seq_printf(m, " N%d=%lu", n, md->node[n]);
+out:
+ seq_putc(m, '\n');
+ kfree(md);
+
+ if (m->count < m->size)
+ m->version = (vma != priv->tail_vma) ? vma->vm_start : 0;
+ return 0;
+}
static const struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
@@ -876,4 +1042,4 @@ const struct file_operations proc_numa_maps_operations = {
.llseek = seq_lseek,
.release = seq_release_private,
};
-#endif
+#endif /* CONFIG_NUMA */
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index c5a4342..e7fb9d2 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2525,171 +2525,3 @@ int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int no_context)
}
return p - buffer;
}
-
-struct numa_maps {
- unsigned long pages;
- unsigned long anon;
- unsigned long active;
- unsigned long writeback;
- unsigned long mapcount_max;
- unsigned long dirty;
- unsigned long swapcache;
- unsigned long node[MAX_NUMNODES];
-};
-
-static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty)
-{
- int count = page_mapcount(page);
-
- md->pages++;
- if (pte_dirty || PageDirty(page))
- md->dirty++;
-
- if (PageSwapCache(page))
- md->swapcache++;
-
- if (PageActive(page) || PageUnevictable(page))
- md->active++;
-
- if (PageWriteback(page))
- md->writeback++;
-
- if (PageAnon(page))
- md->anon++;
-
- if (count > md->mapcount_max)
- md->mapcount_max = count;
-
- md->node[page_to_nid(page)]++;
-}
-
-static int gather_pte_stats(pte_t *pte, unsigned long addr,
- unsigned long pte_size, struct mm_walk *walk)
-{
- struct numa_maps *md;
- struct page *page;
- int nid;
-
- if (pte_none(*pte))
- return 0;
-
- page = pte_page(*pte);
- if (!page)
- return 0;
-
- nid = page_to_nid(page);
- if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
- return 0;
-
- md = walk->private;
- gather_stats(page, md, pte_dirty(*pte));
- return 0;
-}
-
-#ifdef CONFIG_HUGETLB_PAGE
-static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
- unsigned long addr, unsigned long end, struct mm_walk *walk)
-{
- struct numa_maps *md;
- struct page *page;
-
- if (pte_none(*pte))
- return 0;
-
- page = pte_page(*pte);
- if (!page)
- return 0;
-
- md = walk->private;
- gather_stats(page, md, pte_dirty(*pte));
- return 0;
-}
-
-#else
-static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
- unsigned long addr, unsigned long end, struct mm_walk *walk)
-{
- return 0;
-}
-#endif
-
-/*
- * Display pages allocated per node and memory policy via /proc.
- */
-int show_numa_map(struct seq_file *m, void *v)
-{
- struct proc_maps_private *priv = m->private;
- struct vm_area_struct *vma = v;
- struct numa_maps *md;
- struct file *file = vma->vm_file;
- struct mm_struct *mm = vma->vm_mm;
- struct mm_walk walk = {};
- struct mempolicy *pol;
- int n;
- char buffer[50];
-
- if (!mm)
- return 0;
-
- md = kzalloc(sizeof(struct numa_maps), GFP_KERNEL);
- if (!md)
- return 0;
-
- walk.hugetlb_entry = gather_hugetbl_stats;
- walk.pte_entry = gather_pte_stats;
- walk.private = md;
- walk.mm = mm;
-
- pol = get_vma_policy(priv->task, vma, vma->vm_start);
- mpol_to_str(buffer, sizeof(buffer), pol, 0);
- mpol_cond_put(pol);
-
- seq_printf(m, "%08lx %s", vma->vm_start, buffer);
-
- if (file) {
- seq_printf(m, " file=");
- seq_path(m, &file->f_path, "\n\t= ");
- } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
- seq_printf(m, " heap");
- } else if (vma->vm_start <= mm->start_stack &&
- vma->vm_end >= mm->start_stack) {
- seq_printf(m, " stack");
- }
-
- walk_page_range(vma->vm_start, vma->vm_end, &walk);
-
- if (!md->pages)
- goto out;
-
- if (md->anon)
- seq_printf(m," anon=%lu",md->anon);
-
- if (md->dirty)
- seq_printf(m," dirty=%lu",md->dirty);
-
- if (md->pages != md->anon && md->pages != md->dirty)
- seq_printf(m, " mapped=%lu", md->pages);
-
- if (md->mapcount_max > 1)
- seq_printf(m, " mapmax=%lu", md->mapcount_max);
-
- if (md->swapcache)
- seq_printf(m," swapcache=%lu", md->swapcache);
-
- if (md->active < md->pages && !is_vm_hugetlb_page(vma))
- seq_printf(m," active=%lu", md->active);
-
- if (md->writeback)
- seq_printf(m," writeback=%lu", md->writeback);
-
- for_each_node_state(n, N_HIGH_MEMORY)
- if (md->node[n])
- seq_printf(m, " N%d=%lu", n, md->node[n]);
-out:
- seq_putc(m, '\n');
- kfree(md);
-
- if (m->count < m->size)
- m->version = (vma != priv->tail_vma) ? vma->vm_start : 0;
- return 0;
-}
--
1.7.3.5


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