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Subject[tip: sched/core] vhost: Fix livepatch timeouts in vhost_worker()
The following commit has been merged into the sched/core branch of tip:

Commit-ID: 05bfb338fa8dd40b008ce443e397fc374f6bd107
Gitweb: https://git.kernel.org/tip/05bfb338fa8dd40b008ce443e397fc374f6bd107
Author: Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate: Fri, 24 Feb 2023 08:50:01 -08:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 22 Mar 2023 17:09:29 +01:00

vhost: Fix livepatch timeouts in vhost_worker()

Livepatch timeouts were reported due to busy vhost_worker() kthreads.
Now that cond_resched() can do livepatch task switching, use
cond_resched() in vhost_worker(). That's the better way to
conditionally call schedule() anyway.

Reported-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Link: https://lore.kernel.org/r/509f6ea6fe6505f0a75a66026ba531c765ef922f.1677257135.git.jpoimboe@kernel.org
---
drivers/vhost/vhost.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index f11bdbe..822fbdb 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -363,8 +363,7 @@ static int vhost_worker(void *data)
kcov_remote_start_common(dev->kcov_handle);
work->fn(work);
kcov_remote_stop();
- if (need_resched())
- schedule();
+ cond_resched();
}
}
kthread_unuse_mm(dev->mm);
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