linux-kernel - [patch v11 08/13] task isolation: enable return to userspace processing

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Date:   Fri, 04 Feb 2022 14:35:45 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Nitesh Lal <nilal@...hat.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alex Belits <abelits@...its.com>, Peter Xu <peterx@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Oscar Shiang <oscar0225@...email.tw>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [patch v11 08/13] task isolation: enable return to userspace processing

Enable processing of pending task isolation work if per-CPU vmstats
are out of sync with global vmstats.

Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

---

v11:
   Fold patch to add task_isol_exit hooks into
  "sync vmstats on return to userspace" patch.          (Frederic W. Weisbecker)

 include/linux/task_isolation.h |   22 +++++++++++++++++++++-
 kernel/task_isolation.c        |   13 +++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

Index: linux-2.6/kernel/task_isolation.c
===================================================================
--- linux-2.6.orig/kernel/task_isolation.c
+++ linux-2.6/kernel/task_isolation.c
@@ -10,7 +10,6 @@
  */
 
 #include <linux/sched.h>
-#include <linux/task_isolation.h>
 #include <linux/prctl.h>
 #include <linux/slab.h>
 #include <linux/kobject.h>
@@ -20,9 +19,17 @@
 #include <linux/sched/task.h>
 #include <linux/mm.h>
 #include <linux/vmstat.h>
+#include <linux/task_isolation.h>
 
 void __task_isol_exit(struct task_struct *tsk)
 {
+	struct task_isol_info *i;
+
+	i = tsk->task_isol_info;
+	if (!i)
+		return;
+
+	static_key_slow_dec(&vmstat_sync_enabled);
 }
 
 void __task_isol_free(struct task_struct *tsk)
@@ -41,6 +48,12 @@ static struct task_isol_info *task_isol_
 	if (unlikely(!info))
 		return ERR_PTR(-ENOMEM);
 
+	preempt_disable();
+	init_sync_vmstat();
+	preempt_enable();
+
+	static_key_slow_inc(&vmstat_sync_enabled);
+
 	return info;
 }