mm: proc: move show_numa_map() to fs/proc/task_mmu.c

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>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 183 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3b6e4057fab8..e7fb9d25c54e 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2525,186 +2525,3 @@ int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int no_context)
         }
         return p - buffer;
 }
-
-struct numa_maps {
-        struct vm_area_struct *vma;
-        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(pmd_t *pmd, unsigned long addr,
-                unsigned long end, struct mm_walk *walk)
-{
-        struct numa_maps *md;
-        spinlock_t *ptl;
-        pte_t *orig_pte;
-        pte_t *pte;
-
-        md = walk->private;
-        orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
-        do {
-                struct page *page;
-                int nid;
-
-                if (!pte_present(*pte))
-                        continue;
-
-                page = vm_normal_page(md->vma, addr, *pte);
-                if (!page)
-                        continue;
-
-                if (PageReserved(page))
-                        continue;
-
-                nid = page_to_nid(page);
-                if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
-                        continue;
-
-                gather_stats(page, md, pte_dirty(*pte));
-
-        } while (pte++, addr += PAGE_SIZE, addr != end);
-        pte_unmap_unlock(orig_pte, ptl);
-        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;
-
-        md->vma = vma;
-
-        walk.hugetlb_entry = gather_hugetbl_stats;
-        walk.pmd_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;
-}