linux-kernel - [PATCH] zram: set zram bio priority to REQ

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Date:   Tue, 18 Jul 2023 15:11:54 +0800
From:   Huanpeng Xin <xinhuanpeng9@...il.com>
To:     minchan@...nel.org, ngupta@...are.org, axboe@...nel.dk
Cc:     senozhatsky@...omium.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, xinhuanpeng <xinhuanpeng@...omi.com>
Subject: [PATCH] zram: set zram bio priority to REQ_PRIO.

From: xinhuanpeng <xinhuanpeng@...omi.com>

When the system memory pressure is high, set zram bio priority
to REQ_PRIO can quickly swap zarm's memory to backing device,
freeing up more space for zram.

Signed-off-by: xinhuanpeng <xinhuanpeng@...omi.com>
---
 drivers/block/zram/zram_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index b8549c61ff2c..af56766a036b 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -616,7 +616,7 @@ static int read_from_bdev_async(struct zram *zram, struct bio_vec *bvec,
 {
 	struct bio *bio;
 
-	bio = bio_alloc(zram->bdev, 1, parent ? parent->bi_opf : REQ_OP_READ,
+	bio = bio_alloc(zram->bdev, 1, parent ? parent->bi_opf : REQ_OP_READ | REQ_PRIO,
 			GFP_NOIO);
 	if (!bio)
 		return -ENOMEM;
@@ -746,7 +746,7 @@ static ssize_t writeback_store(struct device *dev,
 		}
 
 		bio_init(&bio, zram->bdev, &bio_vec, 1,
-			 REQ_OP_WRITE | REQ_SYNC);
+			 REQ_OP_WRITE | REQ_SYNC | REQ_PRIO);
 		bio.bi_iter.bi_sector = blk_idx * (PAGE_SIZE >> 9);
 
 		bio_add_page(&bio, bvec.bv_page, bvec.bv_len,
-- 
2.37.2