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kernel: provide create_io_thread() helper

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[ Upstream commit cc440e8738e5c875297ac0e90316745093be7e28 ]

Provide a generic helper for setting up an io_uring worker. Returns a
task_struct so that the caller can do whatever setup is needed, then call
wake_up_new_task() to kick it into gear.

Add a kernel_clone_args member, io_thread, which tells copy_process() to
mark the task with PF_IO_WORKER.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe
2021-03-04 12:21:05 -07:00
committed by Greg Kroah-Hartman
parent 1a9148dfd8
commit 1500fed008
2 changed files with 32 additions and 0 deletions
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include/linux/sched/task.h
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@@ -31,6 +31,7 @@ struct kernel_clone_args {
/* Number of elements in *set_tid */
size_t set_tid_size;
int cgroup;
int io_thread;
struct cgroup *cgrp;
struct css_set *cset;
};
@@ -85,6 +86,7 @@ extern void exit_files(struct task_struct *);
extern void exit_itimers(struct task_struct *);
extern pid_t kernel_clone(struct kernel_clone_args *kargs);
struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node);
struct task_struct *fork_idle(int);
struct mm_struct *copy_init_mm(void);
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);