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proc: convert gather_stats to use a folio

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Patch series "Use folio APIs in procfs".

We're down to very few users of the PageFoo macros, with proc being a
major user.

After this patchset and another patchset I have for khugepaged, we can get
rid of PageActive, PageReadahead and PageSwapBacked.  This patchset has
the usual advantages in its own right of removing hidden calls to
compound_head().  We have the page table lock, so the mapcount & refcount
are stable and there can't be any races with folios suddenly becoming tail
pages.


This patch (of 4):

Replaces six calls to compound_head() with one.  Shrinks the function from
5054 bytes to 1756 bytes in an allmodconfig build.

Link: https://lkml.kernel.org/r/20240403171456.1445117-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20240403171456.1445117-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-04-03 18:14:52 +01:00 committed by Andrew Morton
parent 8c9e8381ea
commit f1dc623fa0
1 changed files with 7 additions and 6 deletions
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13
fs/proc/task_mmu.c
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@ -2549,28 +2549,29 @@ struct numa_maps_private {
static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
unsigned long nr_pages)
{
struct folio *folio = page_folio(page);
int count = page_mapcount(page);
md->pages += nr_pages;
if (pte_dirty || PageDirty(page))
if (pte_dirty || folio_test_dirty(folio))
md->dirty += nr_pages;
if (PageSwapCache(page))
if (folio_test_swapcache(folio))
md->swapcache += nr_pages;
if (PageActive(page) || PageUnevictable(page))
if (folio_test_active(folio) || folio_test_unevictable(folio))
md->active += nr_pages;
if (PageWriteback(page))
if (folio_test_writeback(folio))
md->writeback += nr_pages;
if (PageAnon(page))
if (folio_test_anon(folio))
md->anon += nr_pages;
if (count > md->mapcount_max)
md->mapcount_max = count;
md->node[page_to_nid(page)] += nr_pages;
md->node[folio_nid(folio)] += nr_pages;
}
static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,