From 3b7cb745473aec7255d66e3854abaa9c3f46f952 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 8 Jan 2024 11:50:16 -0700 Subject: block: move __get_task_ioprio() into header file We call this once per IO, which can be millions of times per second. Since nobody really uses io priorities, or at least it isn't very common, this is all wasted time and can amount to as much as 3% of the total kernel time. Reviewed-by: Bart Van Assche Signed-off-by: Jens Axboe --- block/ioprio.c | 26 -------------------------- 1 file changed, 26 deletions(-) (limited to 'block') diff --git a/block/ioprio.c b/block/ioprio.c index b5a942519a79..73301a261429 100644 --- a/block/ioprio.c +++ b/block/ioprio.c @@ -139,32 +139,6 @@ out: return ret; } -/* - * If the task has set an I/O priority, use that. Otherwise, return - * the default I/O priority. - * - * Expected to be called for current task or with task_lock() held to keep - * io_context stable. - */ -int __get_task_ioprio(struct task_struct *p) -{ - struct io_context *ioc = p->io_context; - int prio; - - if (p != current) - lockdep_assert_held(&p->alloc_lock); - if (ioc) - prio = ioc->ioprio; - else - prio = IOPRIO_DEFAULT; - - if (IOPRIO_PRIO_CLASS(prio) == IOPRIO_CLASS_NONE) - prio = IOPRIO_PRIO_VALUE(task_nice_ioclass(p), - task_nice_ioprio(p)); - return prio; -} -EXPORT_SYMBOL_GPL(__get_task_ioprio); - static int get_task_ioprio(struct task_struct *p) { int ret; -- cgit v1.2.3