linux-kernel - [PATCH] bcache: add cond_resched() in __bch_cache

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Date:   Thu,  7 Mar 2019 13:15:28 +0800
From:   shile.zhang@...ux.alibaba.com
To:     Coly Li <colyli@...e.de>,
        Kent Overstreet <kent.overstreet@...il.com>
Cc:     linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shile Zhang <shile.zhang@...ux.alibaba.com>
Subject: [PATCH] bcache: add cond_resched() in __bch_cache_cmp()

From: Shile Zhang <shile.zhang@...ux.alibaba.com>

Read /sys/fs/bcache/<uuid>/cacheN/priority_stats can take very long
time with huge cache after long run.

Signed-off-by: Shile Zhang <shile.zhang@...ux.alibaba.com>
---
 drivers/md/bcache/sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 557a8a3..028fea1 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -897,6 +897,7 @@ static void bch_cache_set_internal_release(struct kobject *k)
 
 static int __bch_cache_cmp(const void *l, const void *r)
 {
+	cond_resched();
 	return *((uint16_t *)r) - *((uint16_t *)l);
 }
 
-- 
1.8.3.1