For the case of nr_to_read == lookahead_size, it is better to
decompress asynchronously as well since no page will be needed immediately.
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
---
drivers/staging/erofs/unzip_vle.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index a1376f3c6065..824d2c12c2f3 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -1344,8 +1344,8 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
{
struct inode *const inode = mapping->host;
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
- const bool sync = __should_decompress_synchronously(sbi, nr_pages);
+ bool sync = __should_decompress_synchronously(sbi, nr_pages);
struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);
gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
struct page *head = NULL;
@@ -1363,6 +1363,13 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
prefetchw(&page->flags);
list_del(&page->lru);
+ /*
+ * A pure asynchronous readahead is indicated if
+ * a PG_readahead marked page is hitted at first.
+ * Let's also do asynchronous decompression for this case.
+ */
+ sync &= !(PageReadahead(page) && !head);
+
if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
list_add(&page->lru, &pagepool);
continue;
--
2.14.4
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