linux-kernel - [PATCH] kthread_worker: don't hog the cpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Fri, 25 Aug 2017 14:44:50 -0700
From:   Shaohua Li <shli@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     <akpm@...ux-foundation.org>, <tglx@...utronix.de>
Subject: [PATCH] kthread_worker: don't hog the cpu

If the worker thread continues getting work, it will hog the cpu and rcu
stall complains. Make it a good citizen. This is triggered in a loop
block device test.

Signed-off-by: Shaohua Li <shli@...com>
---
 kernel/kthread.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 26db528..1c19edf 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -637,6 +637,7 @@ int kthread_worker_fn(void *worker_ptr)
 		schedule();
 
 	try_to_freeze();
+	cond_resched();
 	goto repeat;
 }
 EXPORT_SYMBOL_GPL(kthread_worker_fn);
-- 
2.9.5