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Date: Tue, 22 Nov 2016 11:25:27 -0500
From: Zi Yan <zi.yan@...t.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, minchan@...nel.org, vbabka@...e.cz,
mgorman@...hsingularity.net, kirill.shutemov@...ux.intel.com,
n-horiguchi@...jp.nec.com, khandual@...ux.vnet.ibm.com,
Zi Yan <zi.yan@...rutgers.edu>, Zi Yan <ziy@...dia.com>
Subject: [PATCH 2/5] mm: migrate: Change migrate_mode to support combination migration modes.
From: Zi Yan <zi.yan@...rutgers.edu>
From: Zi Yan <ziy@...dia.com>
No functionality is changed.
Signed-off-by: Zi Yan <ziy@...dia.com>
Signed-off-by: Zi Yan <zi.yan@...rutgers.edu>
---
include/linux/migrate_mode.h | 6 +++---
mm/compaction.c | 20 ++++++++++----------
mm/migrate.c | 14 +++++++-------
3 files changed, 20 insertions(+), 20 deletions(-)
diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h
index ebf3d89..0e2deb8 100644
--- a/include/linux/migrate_mode.h
+++ b/include/linux/migrate_mode.h
@@ -8,9 +8,9 @@
* MIGRATE_SYNC will block when migrating pages
*/
enum migrate_mode {
- MIGRATE_ASYNC,
- MIGRATE_SYNC_LIGHT,
- MIGRATE_SYNC,
+ MIGRATE_ASYNC = 1<<0,
+ MIGRATE_SYNC_LIGHT = 1<<1,
+ MIGRATE_SYNC = 1<<2,
};
#endif /* MIGRATE_MODE_H_INCLUDED */
diff --git a/mm/compaction.c b/mm/compaction.c
index 0409a4a..6606ded 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -296,7 +296,7 @@ static void update_pageblock_skip(struct compact_control *cc,
if (migrate_scanner) {
if (pfn > zone->compact_cached_migrate_pfn[0])
zone->compact_cached_migrate_pfn[0] = pfn;
- if (cc->mode != MIGRATE_ASYNC &&
+ if (!(cc->mode & MIGRATE_ASYNC) &&
pfn > zone->compact_cached_migrate_pfn[1])
zone->compact_cached_migrate_pfn[1] = pfn;
} else {
@@ -329,7 +329,7 @@ static void update_pageblock_skip(struct compact_control *cc,
static bool compact_trylock_irqsave(spinlock_t *lock, unsigned long *flags,
struct compact_control *cc)
{
- if (cc->mode == MIGRATE_ASYNC) {
+ if (cc->mode & MIGRATE_ASYNC) {
if (!spin_trylock_irqsave(lock, *flags)) {
cc->contended = true;
return false;
@@ -370,7 +370,7 @@ static bool compact_unlock_should_abort(spinlock_t *lock,
}
if (need_resched()) {
- if (cc->mode == MIGRATE_ASYNC) {
+ if (cc->mode & MIGRATE_ASYNC) {
cc->contended = true;
return true;
}
@@ -393,7 +393,7 @@ static inline bool compact_should_abort(struct compact_control *cc)
{
/* async compaction aborts if contended */
if (need_resched()) {
- if (cc->mode == MIGRATE_ASYNC) {
+ if (cc->mode & MIGRATE_ASYNC) {
cc->contended = true;
return true;
}
@@ -704,7 +704,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
*/
while (unlikely(too_many_isolated(zone))) {
/* async migration should just abort */
- if (cc->mode == MIGRATE_ASYNC)
+ if (cc->mode & MIGRATE_ASYNC)
return 0;
congestion_wait(BLK_RW_ASYNC, HZ/10);
@@ -716,7 +716,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
if (compact_should_abort(cc))
return 0;
- if (cc->direct_compaction && (cc->mode == MIGRATE_ASYNC)) {
+ if (cc->direct_compaction && (cc->mode & MIGRATE_ASYNC)) {
skip_on_failure = true;
next_skip_pfn = block_end_pfn(low_pfn, cc->order);
}
@@ -1204,7 +1204,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
struct page *page;
const isolate_mode_t isolate_mode =
(sysctl_compact_unevictable_allowed ? ISOLATE_UNEVICTABLE : 0) |
- (cc->mode != MIGRATE_SYNC ? ISOLATE_ASYNC_MIGRATE : 0);
+ (!(cc->mode & MIGRATE_SYNC) ? ISOLATE_ASYNC_MIGRATE : 0);
/*
* Start at where we last stopped, or beginning of the zone as
@@ -1250,7 +1250,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
* Async compaction is optimistic to see if the minimum amount
* of work satisfies the allocation.
*/
- if (cc->mode == MIGRATE_ASYNC &&
+ if ((cc->mode & MIGRATE_ASYNC) &&
!migrate_async_suitable(get_pageblock_migratetype(page)))
continue;
@@ -1493,7 +1493,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro
unsigned long start_pfn = zone->zone_start_pfn;
unsigned long end_pfn = zone_end_pfn(zone);
const int migratetype = gfpflags_to_migratetype(cc->gfp_mask);
- const bool sync = cc->mode != MIGRATE_ASYNC;
+ const bool sync = !(cc->mode & MIGRATE_ASYNC);
ret = compaction_suitable(zone, cc->order, cc->alloc_flags,
cc->classzone_idx);
@@ -1589,7 +1589,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro
* order-aligned block, so skip the rest of it.
*/
if (cc->direct_compaction &&
- (cc->mode == MIGRATE_ASYNC)) {
+ (cc->mode & MIGRATE_ASYNC)) {
cc->migrate_pfn = block_end_pfn(
cc->migrate_pfn - 1, cc->order);
/* Draining pcplists is useless in this case */
diff --git a/mm/migrate.c b/mm/migrate.c
index bc6c1c4..4a4cf48 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -394,7 +394,7 @@ static bool buffer_migrate_lock_buffers(struct buffer_head *head,
struct buffer_head *bh = head;
/* Simple case, sync compaction */
- if (mode != MIGRATE_ASYNC) {
+ if (!(mode & MIGRATE_ASYNC)) {
do {
get_bh(bh);
lock_buffer(bh);
@@ -495,7 +495,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
* the mapping back due to an elevated page count, we would have to
* block waiting on other references to be dropped.
*/
- if (mode == MIGRATE_ASYNC && head &&
+ if ((mode & MIGRATE_ASYNC) && head &&
!buffer_migrate_lock_buffers(head, mode)) {
page_ref_unfreeze(page, expected_count);
spin_unlock_irq(&mapping->tree_lock);
@@ -779,7 +779,7 @@ int buffer_migrate_page(struct address_space *mapping,
* with an IRQ-safe spinlock held. In the sync case, the buffers
* need to be locked now
*/
- if (mode != MIGRATE_ASYNC)
+ if (!(mode & MIGRATE_ASYNC))
BUG_ON(!buffer_migrate_lock_buffers(head, mode));
ClearPagePrivate(page);
@@ -861,7 +861,7 @@ static int fallback_migrate_page(struct address_space *mapping,
{
if (PageDirty(page)) {
/* Only writeback pages in full synchronous migration */
- if (mode != MIGRATE_SYNC)
+ if (!(mode & MIGRATE_SYNC))
return -EBUSY;
return writeout(mapping, page);
}
@@ -970,7 +970,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
bool is_lru = !__PageMovable(page);
if (!trylock_page(page)) {
- if (!force || mode == MIGRATE_ASYNC)
+ if (!force || (mode & MIGRATE_ASYNC))
goto out;
/*
@@ -999,7 +999,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
* the retry loop is too short and in the sync-light case,
* the overhead of stalling is too much
*/
- if (mode != MIGRATE_SYNC) {
+ if (!(mode & MIGRATE_SYNC)) {
rc = -EBUSY;
goto out_unlock;
}
@@ -1262,7 +1262,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
return -ENOMEM;
if (!trylock_page(hpage)) {
- if (!force || mode != MIGRATE_SYNC)
+ if (!force || !(mode & MIGRATE_SYNC))
goto out;
lock_page(hpage);
}
--
2.10.2
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