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From: Mike Christie <michael.christie@oracle.com>
To: hdanton@sina.com, hch@infradead.org, stefanha@redhat.com,
	jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com,
	virtualization@lists.linux-foundation.org,
	christian.brauner@ubuntu.com, axboe@kernel.dk,
	linux-kernel@vger.kernel.org
Subject: [PATCH V2 1/9] fork: Make IO worker options flag based
Date: Tue, 21 Sep 2021 16:52:10 -0500	[thread overview]
Message-ID: <20210921215218.89844-2-michael.christie@oracle.com> (raw)
In-Reply-To: <20210921215218.89844-1-michael.christie@oracle.com>

This patchset adds a couple new options to kernel_clone_args for IO thread
like/related users. Instead of adding new fields to kernel_clone_args for
each option, this moves us to a flags based approach by first converting
io_thread.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 include/linux/sched/task.h | 4 +++-
 kernel/fork.c              | 4 ++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index ef02be869cf2..48417c735438 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -18,8 +18,11 @@ struct css_set;
 /* All the bits taken by the old clone syscall. */
 #define CLONE_LEGACY_FLAGS 0xffffffffULL
 
+#define KERN_WORKER_IO		BIT(0)
+
 struct kernel_clone_args {
 	u64 flags;
+	u32 worker_flags;
 	int __user *pidfd;
 	int __user *child_tid;
 	int __user *parent_tid;
@@ -31,7 +34,6 @@ 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;
 };
diff --git a/kernel/fork.c b/kernel/fork.c
index 38681ad44c76..3988106e9609 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2026,7 +2026,7 @@ static __latent_entropy struct task_struct *copy_process(
 	p = dup_task_struct(current, node);
 	if (!p)
 		goto fork_out;
-	if (args->io_thread) {
+	if (args->worker_flags & KERN_WORKER_IO) {
 		/*
 		 * Mark us an IO worker, and block any signal that isn't
 		 * fatal or STOP
@@ -2526,7 +2526,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node)
 		.exit_signal	= (lower_32_bits(flags) & CSIGNAL),
 		.stack		= (unsigned long)fn,
 		.stack_size	= (unsigned long)arg,
-		.io_thread	= 1,
+		.worker_flags	= KERN_WORKER_IO,
 	};
 
 	return copy_process(NULL, 0, node, &args);
-- 
2.25.1

_______________________________________________
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Virtualization@lists.linux-foundation.org
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WARNING: multiple messages have this Message-ID (diff)
From: Mike Christie <michael.christie@oracle.com>
To: hdanton@sina.com, hch@infradead.org, stefanha@redhat.com,
	jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com,
	virtualization@lists.linux-foundation.org,
	christian.brauner@ubuntu.com, axboe@kernel.dk,
	linux-kernel@vger.kernel.org
Cc: Mike Christie <michael.christie@oracle.com>
Subject: [PATCH V2 1/9] fork: Make IO worker options flag based
Date: Tue, 21 Sep 2021 16:52:10 -0500	[thread overview]
Message-ID: <20210921215218.89844-2-michael.christie@oracle.com> (raw)
In-Reply-To: <20210921215218.89844-1-michael.christie@oracle.com>

This patchset adds a couple new options to kernel_clone_args for IO thread
like/related users. Instead of adding new fields to kernel_clone_args for
each option, this moves us to a flags based approach by first converting
io_thread.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 include/linux/sched/task.h | 4 +++-
 kernel/fork.c              | 4 ++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index ef02be869cf2..48417c735438 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -18,8 +18,11 @@ struct css_set;
 /* All the bits taken by the old clone syscall. */
 #define CLONE_LEGACY_FLAGS 0xffffffffULL
 
+#define KERN_WORKER_IO		BIT(0)
+
 struct kernel_clone_args {
 	u64 flags;
+	u32 worker_flags;
 	int __user *pidfd;
 	int __user *child_tid;
 	int __user *parent_tid;
@@ -31,7 +34,6 @@ 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;
 };
diff --git a/kernel/fork.c b/kernel/fork.c
index 38681ad44c76..3988106e9609 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2026,7 +2026,7 @@ static __latent_entropy struct task_struct *copy_process(
 	p = dup_task_struct(current, node);
 	if (!p)
 		goto fork_out;
-	if (args->io_thread) {
+	if (args->worker_flags & KERN_WORKER_IO) {
 		/*
 		 * Mark us an IO worker, and block any signal that isn't
 		 * fatal or STOP
@@ -2526,7 +2526,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node)
 		.exit_signal	= (lower_32_bits(flags) & CSIGNAL),
 		.stack		= (unsigned long)fn,
 		.stack_size	= (unsigned long)arg,
-		.io_thread	= 1,
+		.worker_flags	= KERN_WORKER_IO,
 	};
 
 	return copy_process(NULL, 0, node, &args);
-- 
2.25.1


  reply	other threads:[~2021-09-21 21:53 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-21 21:52 [PATCH V2 0/9] Use copy_process/create_io_thread in vhost layer Mike Christie
2021-09-21 21:52 ` Mike Christie
2021-09-21 21:52 ` Mike Christie [this message]
2021-09-21 21:52   ` [PATCH V2 1/9] fork: Make IO worker options flag based Mike Christie
2021-09-22 12:44   ` Christian Brauner
2021-09-21 21:52 ` [PATCH V2 2/9] fork: pass worker_flags to copy_thread Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-09-22 12:42   ` Christian Brauner
2021-09-22 14:18   ` Geert Uytterhoeven
2021-09-22 14:18     ` Geert Uytterhoeven
2021-09-21 21:52 ` [PATCH V2 3/9] fork: move PF_IO_WORKER's kernel frame setup to new flag Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-09-22 12:32   ` Geert Uytterhoeven
2021-09-22 12:32     ` Geert Uytterhoeven
2021-09-22 12:39     ` Christian Brauner
2021-09-22 12:45     ` Christian Brauner
2021-09-21 21:52 ` [PATCH V2 4/9] fork: add option to not clone or dup files Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-09-22 12:46   ` Christian Brauner
2021-09-21 21:52 ` [PATCH V2 5/9] fork: add helper to clone a process Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-09-22 12:50   ` Christian Brauner
2021-09-21 21:52 ` [PATCH V2 6/9] io_uring: switch to kernel_worker Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-09-22 12:53   ` Christian Brauner
2021-09-21 21:52 ` [PATCH V2 7/9] fork: Add worker flag to ignore signals Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-09-22 12:52   ` Christian Brauner
2021-09-21 21:52 ` [PATCH V2 8/9] vhost: move worker thread fields to new struct Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-10-04 13:12   ` Michael S. Tsirkin
2021-10-04 13:12     ` Michael S. Tsirkin
2021-09-21 21:52 ` [PATCH V2 9/9] vhost: use kernel_worker to check RLIMITs and inherit v2 cgroups Mike Christie
2021-09-21 21:52   ` Mike Christie
2021-10-04 13:12   ` Michael S. Tsirkin
2021-10-04 13:12     ` Michael S. Tsirkin

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