The patch titled
Subject: mm: remove the memory isolate notifier
has been added to the -mm tree. Its filename is
mm-remove-the-memory-isolate-notifier.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-remove-the-memory-isolate-notifier.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-remove-the-memory-isolate-notifier.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm: remove the memory isolate notifier
Luckily, we have no users left, so we can get rid of it. Cleanup
set_migratetype_isolate() a little bit.
Link: http://lkml.kernel.org/r/20191114131911.11783-2-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Pingfan Liu <kernelfans@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/memory.c | 19 -------------------
include/linux/memory.h | 27 ---------------------------
mm/page_isolation.c | 38 ++++----------------------------------
3 files changed, 4 insertions(+), 80 deletions(-)
--- a/drivers/base/memory.c~mm-remove-the-memory-isolate-notifier
+++ a/drivers/base/memory.c
@@ -78,20 +78,6 @@ void unregister_memory_notifier(struct n
}
EXPORT_SYMBOL(unregister_memory_notifier);
-static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain);
-
-int register_memory_isolate_notifier(struct notifier_block *nb)
-{
- return atomic_notifier_chain_register(&memory_isolate_chain, nb);
-}
-EXPORT_SYMBOL(register_memory_isolate_notifier);
-
-void unregister_memory_isolate_notifier(struct notifier_block *nb)
-{
- atomic_notifier_chain_unregister(&memory_isolate_chain, nb);
-}
-EXPORT_SYMBOL(unregister_memory_isolate_notifier);
-
static void memory_block_release(struct device *dev)
{
struct memory_block *mem = to_memory_block(dev);
@@ -183,11 +169,6 @@ int memory_notify(unsigned long val, voi
return blocking_notifier_call_chain(&memory_chain, val, v);
}
-int memory_isolate_notify(unsigned long val, void *v)
-{
- return atomic_notifier_call_chain(&memory_isolate_chain, val, v);
-}
-
/*
* The probe routines leave the pages uninitialized, just as the bootmem code
* does. Make sure we do not access them, but instead use only information from
--- a/include/linux/memory.h~mm-remove-the-memory-isolate-notifier
+++ a/include/linux/memory.h
@@ -55,19 +55,6 @@ struct memory_notify {
int status_change_nid;
};
-/*
- * During pageblock isolation, count the number of pages within the
- * range [start_pfn, start_pfn + nr_pages) which are owned by code
- * in the notifier chain.
- */
-#define MEM_ISOLATE_COUNT (1<<0)
-
-struct memory_isolate_notify {
- unsigned long start_pfn; /* Start of range to check */
- unsigned int nr_pages; /* # pages in range to check */
- unsigned int pages_found; /* # pages owned found by callbacks */
-};
-
struct notifier_block;
struct mem_section;
@@ -94,27 +81,13 @@ static inline int memory_notify(unsigned
{
return 0;
}
-static inline int register_memory_isolate_notifier(struct notifier_block *nb)
-{
- return 0;
-}
-static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
-{
-}
-static inline int memory_isolate_notify(unsigned long val, void *v)
-{
- return 0;
-}
#else
extern int register_memory_notifier(struct notifier_block *nb);
extern void unregister_memory_notifier(struct notifier_block *nb);
-extern int register_memory_isolate_notifier(struct notifier_block *nb);
-extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
int create_memory_block_devices(unsigned long start, unsigned long size);
void remove_memory_block_devices(unsigned long start, unsigned long size);
extern void memory_dev_init(void);
extern int memory_notify(unsigned long val, void *v);
-extern int memory_isolate_notify(unsigned long val, void *v);
extern struct memory_block *find_memory_block(struct mem_section *);
typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *);
extern int walk_memory_blocks(unsigned long start, unsigned long size,
--- a/mm/page_isolation.c~mm-remove-the-memory-isolate-notifier
+++ a/mm/page_isolation.c
@@ -18,9 +18,7 @@
static int set_migratetype_isolate(struct page *page, int migratetype, int isol_flags)
{
struct zone *zone;
- unsigned long flags, pfn;
- struct memory_isolate_notify arg;
- int notifier_ret;
+ unsigned long flags;
int ret = -EBUSY;
zone = page_zone(page);
@@ -35,41 +33,11 @@ static int set_migratetype_isolate(struc
if (is_migrate_isolate_page(page))
goto out;
- pfn = page_to_pfn(page);
- arg.start_pfn = pfn;
- arg.nr_pages = pageblock_nr_pages;
- arg.pages_found = 0;
-
- /*
- * It may be possible to isolate a pageblock even if the
- * migratetype is not MIGRATE_MOVABLE. The memory isolation
- * notifier chain is used by balloon drivers to return the
- * number of pages in a range that are held by the balloon
- * driver to shrink memory. If all the pages are accounted for
- * by balloons, are free, or on the LRU, isolation can continue.
- * Later, for example, when memory hotplug notifier runs, these
- * pages reported as "can be isolated" should be isolated(freed)
- * by the balloon driver through the memory notifier chain.
- */
- notifier_ret = memory_isolate_notify(MEM_ISOLATE_COUNT, &arg);
- notifier_ret = notifier_to_errno(notifier_ret);
- if (notifier_ret)
- goto out;
/*
* FIXME: Now, memory hotplug doesn't call shrink_slab() by itself.
* We just check MOVABLE pages.
*/
- if (!has_unmovable_pages(zone, page, arg.pages_found, migratetype,
- isol_flags))
- ret = 0;
-
- /*
- * immobile means "not-on-lru" pages. If immobile is larger than
- * removable-by-driver pages reported by notifier, we'll fail.
- */
-
-out:
- if (!ret) {
+ if (!has_unmovable_pages(zone, page, 0, migratetype, isol_flags)) {
unsigned long nr_pages;
int mt = get_pageblock_migratetype(page);
@@ -79,8 +47,10 @@ out:
NULL);
__mod_zone_freepage_state(zone, -nr_pages, mt);
+ ret = 0;
}
+out:
spin_unlock_irqrestore(&zone->lock, flags);
if (!ret)
drain_all_pages(zone);
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-fix-uninitialized-memmaps-on-a-partially-populated-last-section.patch
fs-proc-pagec-allow-inspection-of-last-section-and-fix-end-detection.patch
mm-initialize-memmap-of-unavailable-memory-directly.patch
mm-memory_hotplug-dont-free-usage-map-when-removing-a-re-added-early-section.patch
drivers-base-memoryc-cache-blocks-in-radix-tree-to-accelerate-lookup-fix-2.patch
mm-memory_hotplug-poison-memmap-in-remove_pfn_range_from_zone.patch
mm-memory_hotplug-we-always-have-a-zone-in-find_smallestbiggest_section_pfn.patch
mm-memory_hotplug-dont-check-for-all-holes-in-shrink_zone_span.patch
mm-memory_hotplug-drop-local-variables-in-shrink_zone_span.patch
mm-memory_hotplug-cleanup-__remove_pages.patch
mm-memory_hotplug-drop-valid_start-valid_end-from-test_pages_in_a_zone.patch
mm-page_alloc-fix-and-rework-pfn-handling-in-memmap_init_zone.patch
mm-factor-out-next_present_section_nr.patch
mm-remove-the-memory-isolate-notifier.patch
mm-remove-count-parameter-from-has_unmovable_pages.patch
