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mm/compaction: remove unnecessary cursor page in isolate_freepages_block 

The cursor is only used for page forward currently.  We can simply move
page forward directly to remove unnecessary cursor.

Link: https://lkml.kernel.org/r/20230803094901.2915942-4-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kemeng Shi <shikemeng@huawei.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-08-03 17:49:00 +08:00 committed by Andrew Morton
parent a2864a6745
commit dc13292ccc
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
mm/compaction.c
View File

@ -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;
bool locked = false;
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
@ -629,7 +628,7 @@ 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;
@ -666,7 +665,7 @@ 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: