From: Linus Torvalds <torvalds@linux-foundation.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Christian Brauner <brauner@kernel.org>,
Linux kernel regressions list <regressions@lists.linux.dev>,
mst@redhat.com, linux-kernel@vger.kernel.org,
konrad.wilk@oracle.com, Thorsten Leemhuis <linux@leemhuis.info>,
virtualization@lists.linux-foundation.org, hch@infradead.org,
ebiederm@xmission.com, stefanha@redhat.com,
nicolas.dichtel@6wind.com
Subject: Re: [PATCH v11 8/8] vhost: use vhost_tasks for worker threads
Date: Mon, 15 May 2023 08:54:01 -0700 [thread overview]
Message-ID: <CAHk-=wiDqe+H7UnhD0qLbL8K8hnWUEdsRqcM4QnY=gZ3GytBRQ@mail.gmail.com> (raw)
In-Reply-To: <33b84605-1d0c-1b0e-7927-7ffa96b3c308@kernel.dk>
[-- Attachment #1: Type: text/plain, Size: 401 bytes --]
On Mon, May 15, 2023 at 8:52 AM Jens Axboe <axboe@kernel.dk> wrote:
>
> On 5/15/23 9:44?AM, Linus Torvalds wrote:
> >
> > So I think the patch should just look something like the attached.
> > Mike, can you test this on whatever vhost test-suite?
>
> Seems like that didn't get attached...
Blush. I decided to built-test it, and then forgot to attach it. Here.
Linus
[-- Attachment #2: patch.diff --]
[-- Type: text/x-patch, Size: 1712 bytes --]
kernel/fork.c | 12 +++---------
kernel/vhost_task.c | 3 ++-
2 files changed, 5 insertions(+), 10 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index ed4e01daccaa..cd06b137418f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2338,14 +2338,10 @@ __latent_entropy struct task_struct *copy_process(
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
- * fatal or STOP
- */
+ if (args->io_thread)
p->flags |= PF_IO_WORKER;
+ if (args->ignore_signals)
siginitsetinv(&p->blocked, sigmask(SIGKILL)|sigmask(SIGSTOP));
- }
if (args->name)
strscpy_pad(p->comm, args->name, sizeof(p->comm));
@@ -2517,9 +2513,6 @@ __latent_entropy struct task_struct *copy_process(
if (retval)
goto bad_fork_cleanup_io;
- if (args->ignore_signals)
- ignore_signals(p);
-
stackleak_task_init(p);
if (pid != &init_struct_pid) {
@@ -2861,6 +2854,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node)
.fn_arg = arg,
.io_thread = 1,
.user_worker = 1,
+ .ignore_signals = 1,
};
return copy_process(NULL, 0, node, &args);
diff --git a/kernel/vhost_task.c b/kernel/vhost_task.c
index b7cbd66f889e..2e334b2d7cc4 100644
--- a/kernel/vhost_task.c
+++ b/kernel/vhost_task.c
@@ -75,7 +75,8 @@ struct vhost_task *vhost_task_create(int (*fn)(void *), void *arg,
const char *name)
{
struct kernel_clone_args args = {
- .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM,
+ .flags = CLONE_FS | CLONE_UNTRACED | CLONE_VM |
+ CLONE_THREAD | CLONE_SIGHAND,
.exit_signal = 0,
.fn = vhost_task_fn,
.name = name,
[-- Attachment #3: Type: text/plain, Size: 183 bytes --]
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next prev parent reply other threads:[~2023-05-15 15:54 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-02 23:25 [PATCH v11 0/8] Use copy_process in vhost layer Mike Christie
2023-02-02 23:25 ` [PATCH v11 1/8] fork: Make IO worker options flag based Mike Christie
2023-02-03 0:14 ` Linus Torvalds
2023-02-02 23:25 ` [PATCH v11 2/8] fork/vm: Move common PF_IO_WORKER behavior to new flag Mike Christie
2023-02-02 23:25 ` [PATCH v11 3/8] fork: add USER_WORKER flag to not dup/clone files Mike Christie
2023-02-03 0:16 ` Linus Torvalds
2023-02-02 23:25 ` [PATCH v11 4/8] fork: Add USER_WORKER flag to ignore signals Mike Christie
2023-02-03 0:19 ` Linus Torvalds
2023-02-05 16:06 ` Mike Christie
2023-02-02 23:25 ` [PATCH v11 5/8] fork: allow kernel code to call copy_process Mike Christie
2023-02-02 23:25 ` [PATCH v11 6/8] vhost_task: Allow vhost layer to use copy_process Mike Christie
2023-02-03 0:43 ` Linus Torvalds
2023-02-02 23:25 ` [PATCH v11 7/8] vhost: move worker thread fields to new struct Mike Christie
2023-02-02 23:25 ` [PATCH v11 8/8] vhost: use vhost_tasks for worker threads Mike Christie
[not found] ` <aba6cca4-e66c-768f-375c-b38c8ba5e8a8@6wind.com>
2023-05-05 18:22 ` Linus Torvalds
2023-05-05 22:37 ` Mike Christie
2023-05-06 1:53 ` Linus Torvalds
2023-05-13 12:39 ` Thorsten Leemhuis
2023-05-13 15:08 ` Linus Torvalds
[not found] ` <20230515-vollrausch-liebgeworden-2765f3ca3540@brauner>
2023-05-15 15:44 ` Linus Torvalds
2023-05-15 15:52 ` Jens Axboe
2023-05-15 15:54 ` Linus Torvalds [this message]
2023-05-15 17:23 ` Linus Torvalds
2023-05-15 15:56 ` Linus Torvalds
2023-05-15 22:23 ` Mike Christie
2023-05-15 22:54 ` Linus Torvalds
2023-05-16 3:53 ` Mike Christie
2023-05-16 13:18 ` Oleg Nesterov
2023-05-16 13:40 ` Oleg Nesterov
2023-05-16 15:56 ` Eric W. Biederman
2023-05-16 18:37 ` Oleg Nesterov
2023-05-16 20:12 ` Eric W. Biederman
2023-05-17 17:09 ` Oleg Nesterov
2023-05-17 18:22 ` Mike Christie
[not found] ` <20230516-weltmeere-backofen-27f12ae2c9e0@brauner>
2023-05-16 16:24 ` Mike Christie
2023-07-20 13:06 ` Michael S. Tsirkin
2023-07-23 4:03 ` michael.christie
2023-07-23 9:31 ` Michael S. Tsirkin
2023-08-10 18:57 ` Michael S. Tsirkin
2023-08-11 18:51 ` Mike Christie
2023-08-13 19:01 ` Michael S. Tsirkin
2023-08-14 3:13 ` michael.christie
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