diff options
| author | Mike Christie <michael.christie@oracle.com> | 2023-03-10 23:03:26 +0100 |
|---|---|---|
| committer | Christian Brauner (Microsoft) <brauner@kernel.org> | 2023-03-12 10:54:43 +0100 |
| commit | 54e6842d0775ba76db65cbe21311c3ca466e663d (patch) | |
| tree | a530a9aaf2f6cb9a1037c178fba5d111ace28135 | |
| parent | kernel: Make io_thread and kthread bit fields (diff) | |
| download | linux-54e6842d0775ba76db65cbe21311c3ca466e663d.tar.xz linux-54e6842d0775ba76db65cbe21311c3ca466e663d.zip | |
fork/vm: Move common PF_IO_WORKER behavior to new flag
This adds a new flag, PF_USER_WORKER, that's used for behavior common to
to both PF_IO_WORKER and users like vhost which will use a new helper
instead of create_io_thread because they require different behavior for
operations like signal handling.
The common behavior PF_USER_WORKER covers is the vm reclaim handling.
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
| -rw-r--r-- | include/linux/sched.h | 2 | ||||
| -rw-r--r-- | include/linux/sched/task.h | 1 | ||||
| -rw-r--r-- | kernel/fork.c | 3 | ||||
| -rw-r--r-- | mm/vmscan.c | 4 |
4 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 63d242164b1a..e1e605b1255b 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1729,7 +1729,7 @@ extern struct pid *cad_pid; #define PF_MEMALLOC 0x00000800 /* Allocating memory */ #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ -#define PF__HOLE__00004000 0x00004000 +#define PF_USER_WORKER 0x00004000 /* Kernel thread cloned from userspace thread */ #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ #define PF__HOLE__00010000 0x00010000 #define PF_KSWAPD 0x00020000 /* I am kswapd */ diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index 268c77a42155..2950e83d5382 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -27,6 +27,7 @@ struct kernel_clone_args { int exit_signal; u32 kthread:1; u32 io_thread:1; + u32 user_worker:1; unsigned long stack; unsigned long stack_size; unsigned long tls; diff --git a/kernel/fork.c b/kernel/fork.c index 81dfb2532148..fb8ec192c199 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2103,6 +2103,8 @@ static __latent_entropy struct task_struct *copy_process( p->flags &= ~PF_KTHREAD; if (args->kthread) p->flags |= PF_KTHREAD; + if (args->user_worker) + p->flags |= PF_USER_WORKER; if (args->io_thread) { /* * Mark us an IO worker, and block any signal that isn't @@ -2630,6 +2632,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node) .fn = fn, .fn_arg = arg, .io_thread = 1, + .user_worker = 1, }; return copy_process(NULL, 0, node, &args); diff --git a/mm/vmscan.c b/mm/vmscan.c index 9c1c5e8b24b8..7ba6bfdd9a5f 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1151,12 +1151,12 @@ void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason) DEFINE_WAIT(wait); /* - * Do not throttle IO workers, kthreads other than kswapd or + * Do not throttle user workers, kthreads other than kswapd or * workqueues. They may be required for reclaim to make * forward progress (e.g. journalling workqueues or kthreads). */ if (!current_is_kswapd() && - current->flags & (PF_IO_WORKER|PF_KTHREAD)) { + current->flags & (PF_USER_WORKER|PF_KTHREAD)) { cond_resched(); return; } |