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authorJens Axboe <axboe@kernel.dk>2021-03-10 05:49:02 +0300
committerJens Axboe <axboe@kernel.dk>2021-03-10 17:28:43 +0300
commite22bc9b481a90d7898984ea17621f04a653e2cd1 (patch)
tree9c7f6a4821f3afecdbeca3eb07e2d397e0a3dc4c /kernel
parente8f98f24549d62cc54bf608c815904a56d4437bc (diff)
downloadlinux-e22bc9b481a90d7898984ea17621f04a653e2cd1.tar.xz
kernel: make IO threads unfreezable by default
The io-wq threads were already marked as no-freeze, but the manager was not. On resume, we perpetually have signal_pending() being true, and hence the manager will loop and spin 100% of the time. Just mark the tasks created by create_io_thread() as PF_NOFREEZE by default, and remove any knowledge of it in io-wq and io_uring. Reported-by: Kevin Locke <kevin@kevinlocke.name> Tested-by: Kevin Locke <kevin@kevinlocke.name> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index d3171e8e88e5..72e444cd0ffe 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2436,6 +2436,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node)
if (!IS_ERR(tsk)) {
sigfillset(&tsk->blocked);
sigdelsetmask(&tsk->blocked, sigmask(SIGKILL));
+ tsk->flags |= PF_NOFREEZE;
}
return tsk;
}