On 7/30/2023 1:43 AM, Kemeng Shi wrote:
The cursor is only used for page forward currently. We can simply move page
forward directly to remove unnecessary cursor.
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
LGTM.
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 65791a74c5e8..cfb661f4ce23 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -589,7 +589,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
bool strict)
{
int nr_scanned = 0, total_isolated = 0;
- struct page *cursor;
+ struct page *page;
unsigned long flags = 0;
spinlock_t *locked = NULL;
unsigned long blockpfn = *start_pfn;
@@ -599,12 +599,11 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
if (strict)
stride = 1;
- cursor = pfn_to_page(blockpfn);
+ page = pfn_to_page(blockpfn);
/* Isolate free pages. */
- for (; blockpfn < end_pfn; blockpfn += stride, cursor += stride) {
+ for (; blockpfn < end_pfn; blockpfn += stride, page += stride) {
int isolated;
- struct page *page = cursor;
/*
* Periodically drop the lock (if held) regardless of its
@@ -628,7 +627,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
if (likely(order <= MAX_ORDER)) {
blockpfn += (1UL << order) - 1;
- cursor += (1UL << order) - 1;
+ page += (1UL << order) - 1;
nr_scanned += (1UL << order) - 1;
}
goto isolate_fail;
@@ -665,7 +664,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
}
/* Advance to the end of split page */
blockpfn += isolated - 1;
- cursor += isolated - 1;
+ page += isolated - 1;
continue;
isolate_fail:
