From: Prarit Bhargava <prarit@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Prarit Bhargava <prarit@redhat.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Jessica Yu <jeyu@kernel.org>
Subject: [PATCH v2] kernel/module: Reschedule while waiting for modules to finish loading
Date: Tue, 30 Apr 2019 18:18:07 -0400 [thread overview]
Message-ID: <20190430221807.2418-1-prarit@redhat.com> (raw)
On a s390 z14 LAR with 2 cpus about stalls about 3% of the time while
loading the s390_trng.ko module.
Add a reschedule point to the loop that waits for modules to complete
loading.
v2: cleanup Fixes line.
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Fixes: commit f9a75c1d717f ("modules: Only return -EEXIST for modules that have finished loading")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
---
kernel/module.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/module.c b/kernel/module.c
index 410eeb7e4f1d..48748cfec991 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3585,6 +3585,7 @@ static int add_unformed_module(struct module *mod)
finished_loading(mod->name));
if (err)
goto out_unlocked;
+ cond_resched();
goto again;
}
err = -EEXIST;
--
2.18.1
next reply other threads:[~2019-04-30 22:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 22:18 Prarit Bhargava [this message]
2019-04-30 22:20 ` [PATCH v2] kernel/module: Reschedule while waiting for modules to finish loading Prarit Bhargava
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