The patch titled
Subject: mm: rmap: split out page_remove_file_rmap()
has been added to the -mm tree. Its filename is
mm-rmap-split-out-page_remove_file_rmap.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-rmap-split-out-page_remove_file_rmap.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-rmap-split-out-page_remove_file_rmap.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: rmap: split out page_remove_file_rmap()
page_remove_rmap() has too many branches on PageAnon() and is hard to
follow. Move the file part into a separate function.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/rmap.c | 78 ++++++++++++++++++++++++++++++----------------------
1 file changed, 46 insertions(+), 32 deletions(-)
diff -puN mm/rmap.c~mm-rmap-split-out-page_remove_file_rmap mm/rmap.c
--- a/mm/rmap.c~mm-rmap-split-out-page_remove_file_rmap
+++ a/mm/rmap.c
@@ -1054,6 +1054,36 @@ void page_add_file_rmap(struct page *pag
mem_cgroup_end_page_stat(memcg, locked, flags);
}
+static void page_remove_file_rmap(struct page *page)
+{
+ struct mem_cgroup *memcg;
+ unsigned long flags;
+ bool locked;
+
+ memcg = mem_cgroup_begin_page_stat(page, &locked, &flags);
+
+ /* page still mapped by someone else? */
+ if (!atomic_add_negative(-1, &page->_mapcount))
+ goto out;
+
+ /* Hugepages are not counted in NR_FILE_MAPPED for now. */
+ if (unlikely(PageHuge(page)))
+ goto out;
+
+ /*
+ * We use the irq-unsafe __{inc|mod}_zone_page_stat because
+ * these counters are not modified in interrupt context, and
+ * pte lock(a spinlock) is held, which implies preemption disabled.
+ */
+ __dec_zone_page_state(page, NR_FILE_MAPPED);
+ mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
+
+ if (unlikely(PageMlocked(page)))
+ clear_page_mlock(page);
+out:
+ mem_cgroup_end_page_stat(memcg, locked, flags);
+}
+
/**
* page_remove_rmap - take down pte mapping from a page
* @page: page to remove mapping from
@@ -1062,46 +1092,33 @@ void page_add_file_rmap(struct page *pag
*/
void page_remove_rmap(struct page *page)
{
- struct mem_cgroup *uninitialized_var(memcg);
- bool anon = PageAnon(page);
- unsigned long flags;
- bool locked;
-
- /*
- * The anon case has no mem_cgroup page_stat to update; but may
- * uncharge_page() below, where the lock ordering can deadlock if
- * we hold the lock against page_stat move: so avoid it on anon.
- */
- if (!anon)
- memcg = mem_cgroup_begin_page_stat(page, &locked, &flags);
+ if (!PageAnon(page)) {
+ page_remove_file_rmap(page);
+ return;
+ }
/* page still mapped by someone else? */
if (!atomic_add_negative(-1, &page->_mapcount))
- goto out;
+ return;
+
+ /* Hugepages are not counted in NR_ANON_PAGES for now. */
+ if (unlikely(PageHuge(page)))
+ return;
/*
- * Hugepages are not counted in NR_ANON_PAGES nor NR_FILE_MAPPED
- * and not charged by memcg for now.
- *
* We use the irq-unsafe __{inc|mod}_zone_page_stat because
* these counters are not modified in interrupt context, and
- * these counters are not modified in interrupt context, and
* pte lock(a spinlock) is held, which implies preemption disabled.
*/
- if (unlikely(PageHuge(page)))
- goto out;
- if (anon) {
- if (PageTransHuge(page))
- __dec_zone_page_state(page,
- NR_ANON_TRANSPARENT_HUGEPAGES);
- __mod_zone_page_state(page_zone(page), NR_ANON_PAGES,
- -hpage_nr_pages(page));
- } else {
- __dec_zone_page_state(page, NR_FILE_MAPPED);
- mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
- }
+ if (PageTransHuge(page))
+ __dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
+
+ __mod_zone_page_state(page_zone(page), NR_ANON_PAGES,
+ -hpage_nr_pages(page));
+
if (unlikely(PageMlocked(page)))
clear_page_mlock(page);
+
/*
* It would be tidy to reset the PageAnon mapping here,
* but that might overwrite a racing page_add_anon_rmap
@@ -1111,9 +1128,6 @@ void page_remove_rmap(struct page *page)
* Leaving it set also helps swapoff to reinstate ptes
* faster for those pages still in swapcache.
*/
-out:
- if (!anon)
- mem_cgroup_end_page_stat(memcg, locked, flags);
}
/*
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
cgroup-kmemleak-add-kmemleak_free-for-cgroup-deallocations.patch
mm-page-writeback-inline-account_page_dirtied-into-single-caller.patch
mm-memcontrol-fix-missed-end-writeback-page-accounting.patch
mm-memcontrol-fix-missed-end-writeback-page-accounting-fix.patch
mm-rmap-split-out-page_remove_file_rmap.patch
mm-memcontrol-lockless-page-counters.patch
mm-memcontrol-lockless-page-counters-fix.patch
mm-memcontrol-lockless-page-counters-fix-fix.patch
mm-memcontrol-lockless-page-counters-fix-2.patch
mm-hugetlb_cgroup-convert-to-lockless-page-counters.patch
kernel-res_counter-remove-the-unused-api.patch
kernel-res_counter-remove-the-unused-api-fix.patch
kernel-res_counter-remove-the-unused-api-fix-2.patch
mm-memcontrol-convert-reclaim-iterator-to-simple-css-refcounting.patch
mm-memcontrol-convert-reclaim-iterator-to-simple-css-refcounting-fix.patch
mm-memcontrol-take-a-css-reference-for-each-charged-page.patch
mm-memcontrol-remove-obsolete-kmemcg-pinning-tricks.patch
mm-memcontrol-continue-cache-reclaim-from-offlined-groups.patch
mm-memcontrol-remove-synchroneous-stock-draining-code.patch
mm-vmscan-count-only-dirty-pages-as-congested.patch
memcg-simplify-unreclaimable-groups-handling-in-soft-limit-reclaim.patch
mm-memcontrol-update-mem_cgroup_page_lruvec-documentation.patch
mm-memcontrol-clarify-migration-where-old-page-is-uncharged.patch
memcg-remove-activate_kmem_mutex.patch
mm-memcontrol-micro-optimize-mem_cgroup_split_huge_fixup.patch
mm-memcontrol-uncharge-pages-on-swapout.patch
mm-memcontrol-uncharge-pages-on-swapout-fix.patch
mm-memcontrol-remove-unnecessary-pcg_memsw-memoryswap-charge-flag.patch
mm-memcontrol-remove-unnecessary-pcg_mem-memory-charge-flag.patch
mm-memcontrol-remove-unnecessary-pcg_used-pc-mem_cgroup-valid-flag.patch
mm-memcontrol-remove-unnecessary-pcg_used-pc-mem_cgroup-valid-flag-fix.patch
mm-memcontrol-inline-memcg-move_lock-locking.patch
mm-memcontrol-dont-pass-a-null-memcg-to-mem_cgroup_end_move.patch
mm-memcontrol-fold-mem_cgroup_start_move-mem_cgroup_end_move.patch
debugging-keep-track-of-page-owners.patch
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