On 4/28/21 10:00 PM, Xu Yu wrote:
This makes pinned tmpfs pages bail out early in the process of page
migration, like what pinned anonymous pages do.
Signed-off-by: Xu Yu <xuyu@xxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index e04f4476e68e..78c3b992a1c9 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -964,11 +964,11 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
}
/*
- * Migration will fail if an anonymous page is pinned in memory,
- * so avoid taking lru_lock and isolating it unnecessarily in an
- * admittedly racy check.
+ * Migration will fail if an anonymous or tmpfs page is pinned
+ * in memory, so avoid taking lru_lock and isolating it
+ * unnecessarily in an admittedly racy check.
*/
- if (!page_mapping(page) &&
+ if (!page_is_file_lru(page) &&
page_count(page) > page_mapcount(page))
Sorry, this patch is flawed, since tmpfs page cache takes an extra page
count.
Please ignore this patch.
goto isolate_fail;
--
Thanks,
Yu
