The patch titled
rmap: add exclusive page to private anon_vma on swapin
has been added to the -mm tree. Its filename is
rmap-add-exclusive-page-to-private-anon_vma-on-swapin.patch
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Subject: rmap: add exclusive page to private anon_vma on swapin
From: Rik van Riel <riel@xxxxxxxxxx>
On swapin it is fairly common for a page to be owned exclusively by one
process. In that case we want to add the page to the anon_vma of that
process's VMA, instead of to the root anon_vma.
This will reduce the amount of rmap searching that the swapout code needs
to do.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rmap.h | 2 ++
mm/memory.c | 4 +++-
mm/rmap.c | 13 ++++++++++++-
3 files changed, 17 insertions(+), 2 deletions(-)
diff -puN include/linux/rmap.h~rmap-add-exclusive-page-to-private-anon_vma-on-swapin include/linux/rmap.h
--- a/include/linux/rmap.h~rmap-add-exclusive-page-to-private-anon_vma-on-swapin
+++ a/include/linux/rmap.h
@@ -162,6 +162,8 @@ static inline void anon_vma_merge(struct
*/
void page_move_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
+void do_page_add_anon_rmap(struct page *, struct vm_area_struct *,
+ unsigned long, int);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_file_rmap(struct page *);
void page_remove_rmap(struct page *);
diff -puN mm/memory.c~rmap-add-exclusive-page-to-private-anon_vma-on-swapin mm/memory.c
--- a/mm/memory.c~rmap-add-exclusive-page-to-private-anon_vma-on-swapin
+++ a/mm/memory.c
@@ -2618,6 +2618,7 @@ static int do_swap_page(struct mm_struct
swp_entry_t entry;
pte_t pte;
struct mem_cgroup *ptr = NULL;
+ int exclusive = 0;
int ret = 0;
if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
@@ -2712,10 +2713,11 @@ static int do_swap_page(struct mm_struct
if ((flags & FAULT_FLAG_WRITE) && reuse_swap_page(page)) {
pte = maybe_mkwrite(pte_mkdirty(pte), vma);
flags &= ~FAULT_FLAG_WRITE;
+ exclusive = 1;
}
flush_icache_page(vma, page);
set_pte_at(mm, address, page_table, pte);
- page_add_anon_rmap(page, vma, address);
+ do_page_add_anon_rmap(page, vma, address, exclusive);
/* It's better to call commit-charge after rmap is established */
mem_cgroup_commit_charge_swapin(page, ptr);
diff -puN mm/rmap.c~rmap-add-exclusive-page-to-private-anon_vma-on-swapin mm/rmap.c
--- a/mm/rmap.c~rmap-add-exclusive-page-to-private-anon_vma-on-swapin
+++ a/mm/rmap.c
@@ -832,6 +832,17 @@ static void __page_check_anon_rmap(struc
void page_add_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
+ do_page_add_anon_rmap(page, vma, address, 0);
+}
+
+/*
+ * Special version of the above for do_swap_page, which often runs
+ * into pages that are exclusively owned by the current process.
+ * Everybody else should continue to use page_add_anon_rmap above.
+ */
+void do_page_add_anon_rmap(struct page *page,
+ struct vm_area_struct *vma, unsigned long address, int exclusive)
+{
int first = atomic_inc_and_test(&page->_mapcount);
if (first)
__inc_zone_page_state(page, NR_ANON_PAGES);
@@ -841,7 +852,7 @@ void page_add_anon_rmap(struct page *pag
VM_BUG_ON(!PageLocked(page));
VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end);
if (first)
- __page_set_anon_rmap(page, vma, address, 0);
+ __page_set_anon_rmap(page, vma, address, exclusive);
else
__page_check_anon_rmap(page, vma, address);
}
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
mm-rename-anon_vma_lock-to-vma_lock_anon_vma.patch
mm-change-direct-call-of-spin_lockanon_vma-lock-to-inline-function.patch
mm-track-the-root-oldest-anon_vma.patch
mm-track-the-root-oldest-anon_vma-fix.patch
mm-always-lock-the-root-oldest-anon_vma.patch
mm-extend-ksm-refcounts-to-the-anon_vma-root.patch
mm-extend-ksm-refcounts-to-the-anon_vma-root-fix.patch
oom-filter-tasks-not-sharing-the-same-cpuset.patch
oom-sacrifice-child-with-highest-badness-score-for-parent.patch
mmap-remove-unnecessary-lock-from-__vma_link.patch
rmap-always-add-new-vmas-at-the-end.patch
ksm-fix-ksm-swapin-time-optimization.patch
rmap-always-use-anon_vma-root-pointer.patch
rmap-resurrect-page_address_in_vma-anon_vma-check.patch
add-anon_vma-bug-checks.patch
vmscan-zone_reclaim-dont-call-disable_swap_token.patch
vmscan-recalculate-lru_pages-on-each-priority.patch
vmscan-tracing-add-trace-events-for-kswapd-wakeup-sleeping-and-direct-reclaim.patch
vmscan-tracing-add-trace-events-for-lru-page-isolation.patch
vmscan-tracing-add-trace-event-when-a-page-is-written.patch
vmscan-tracing-add-a-postprocessing-script-for-reclaim-related-ftrace-events.patch
vmscan-kill-prev_priority-completely.patch
vmscan-simplify-shrink_inactive_list.patch
vmscan-remove-unnecessary-temporary-vars-in-do_try_to_free_pages.patch
vmscan-set-up-pagevec-as-late-as-possible-in-shrink_inactive_list.patch
vmscan-set-up-pagevec-as-late-as-possible-in-shrink_page_list.patch
vmscan-update-isolated-page-counters-outside-of-main-path-in-shrink_inactive_list.patch
rmap-add-exclusive-page-to-private-anon_vma-on-swapin.patch
--
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