The patch titled
Opportunistically move mlocked pages off the LRU
has been removed from the -mm tree. Its filename was
opportunistically-move-mlocked-pages-off-the-lru.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: Opportunistically move mlocked pages off the LRU
From: Christoph Lameter <clameter@xxxxxxx>
Opportunistically move mlocked pages off the LRU
Add a new function try_to_mlock() that attempts to move a page off the LRU and
marks it mlocked.
This function can then be used in various code paths to move pages off the LRU
immediately. Early discovery will make NR_MLOCK track the actual number of
mlocked pages in the system more closely.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff -puN mm/memory.c~opportunistically-move-mlocked-pages-off-the-lru mm/memory.c
--- a/mm/memory.c~opportunistically-move-mlocked-pages-off-the-lru
+++ a/mm/memory.c
@@ -59,6 +59,7 @@
#include <linux/swapops.h>
#include <linux/elf.h>
+#include <linux/mm_inline.h>
#ifndef CONFIG_NEED_MULTIPLE_NODES
/* use the per-pgdat data instead for discontigmem - mbligh */
@@ -920,6 +921,34 @@ static void add_anon_page(struct vm_area
}
/*
+ * Opportunistically move the page off the LRU
+ * if possible. If we do not succeed then the LRU
+ * scans will take the page off.
+ */
+static void try_to_set_mlocked(struct page *page)
+{
+ struct zone *zone;
+ unsigned long flags;
+
+ if (!PageLRU(page) || PageMlocked(page))
+ return;
+
+ zone = page_zone(page);
+ if (spin_trylock_irqsave(&zone->lru_lock, flags)) {
+ if (PageLRU(page) && !PageMlocked(page)) {
+ ClearPageLRU(page);
+ if (PageActive(page))
+ del_page_from_active_list(zone, page);
+ else
+ del_page_from_inactive_list(zone, page);
+ ClearPageActive(page);
+ SetPageMlocked(page);
+ __inc_zone_page_state(page, NR_MLOCK);
+ }
+ spin_unlock_irqrestore(&zone->lru_lock, flags);
+ }
+}
+/*
* Do a quick page-table lookup for a single page.
*/
struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
@@ -979,6 +1008,8 @@ struct page *follow_page(struct vm_area_
set_page_dirty(page);
mark_page_accessed(page);
}
+ if (vma->vm_flags & VM_LOCKED)
+ try_to_set_mlocked(page);
unlock:
pte_unmap_unlock(ptep, ptl);
out:
@@ -2317,6 +2348,8 @@ retry:
else {
inc_mm_counter(mm, file_rss);
page_add_file_rmap(new_page);
+ if (vma->vm_flags & VM_LOCKED)
+ try_to_set_mlocked(new_page);
if (write_access) {
dirty_page = new_page;
get_page(dirty_page);
_
Patches currently in -mm which might be from clameter@xxxxxxx are
origin.patch
fix-mempolicys-check-on-a-system-with-memory-less-node.patch
use-zvc-counters-to-establish-exact-size-of-dirtyable-pages.patch
use-zvc-counters-to-establish-exact-size-of-dirtyable-pages-fix.patch
make-try_to_unmap-return-a-special-exit-code.patch
add-pagemlocked-page-state-bit-and-lru-infrastructure.patch
add-nr_mlock-zvc.patch
logic-to-move-mlocked-pages.patch
consolidate-new-anonymous-page-code-paths.patch
opportunistically-move-mlocked-pages-off-the-lru.patch
smaps-extract-pmd-walker-from-smaps-code.patch
smaps-add-pages-referenced-count-to-smaps.patch
smaps-add-clear_refs-file-to-clear-reference.patch
smaps-add-clear_refs-file-to-clear-reference-fix.patch
smaps-add-clear_refs-file-to-clear-reference-fix-fix.patch
replace-highest_possible_node_id-with-nr_node_ids.patch
convert-highest_possible_processor_id-to-nr_cpu_ids.patch
convert-highest_possible_processor_id-to-nr_cpu_ids-fix.patch
slab-reduce-size-of-alien-cache-to-cover-only-possible-nodes.patch
slab-shutdown-cache_reaper-when-cpu-goes-down.patch
mm-only-sched-add-a-few-scheduler-event-counters.patch
mm-implement-swap-prefetching-vs-zvc-stuff.patch
mm-implement-swap-prefetching-vs-zvc-stuff-2.patch
zvc-support-nr_slab_reclaimable--nr_slab_unreclaimable-swap_prefetch.patch
reduce-max_nr_zones-swap_prefetch-remove-incorrect-use-of-zone_highmem.patch
numa-add-zone_to_nid-function-swap_prefetch.patch
remove-uses-of-kmem_cache_t-from-mm-and-include-linux-slabh-prefetch.patch
readahead-state-based-method-aging-accounting.patch
readahead-state-based-method-aging-accounting-vs-zvc-changes.patch
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