From: Marcelo Tosatti <mtosatti@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Nitesh Lal <nilal@redhat.com>,
Nicolas Saenz Julienne <nsaenzju@redhat.com>,
Frederic Weisbecker <frederic@kernel.org>,
Christoph Lameter <cl@linux.com>,
Juri Lelli <juri.lelli@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Alex Belits <abelits@belits.com>, Peter Xu <peterx@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch v7 07/10] task isolation: enable return to userspace processing
Date: Fri, 12 Nov 2021 09:35:38 -0300 [thread overview]
Message-ID: <20211112123750.850261357@fuller.cnet> (raw)
In-Reply-To: 20211112123531.497831890@fuller.cnet
Enable processing of pending task isolation work if per-CPU vmstats
are out of sync with global vmstats.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
include/linux/task_isolation.h | 22 +++++++++++++++++++++-
kernel/task_isolation.c | 13 +++++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)
Index: linux-2.6/include/linux/task_isolation.h
===================================================================
--- linux-2.6.orig/include/linux/task_isolation.h
+++ linux-2.6/include/linux/task_isolation.h
@@ -5,6 +5,9 @@
#ifdef CONFIG_CPU_ISOLATION
+#include <linux/vmstat.h>
+#include <uapi/linux/prctl.h>
+
struct isol_info {
/* Which features have been configured */
u64 conf_mask;
@@ -51,7 +54,24 @@ void isolation_exit_to_user_mode(void);
static inline int task_isol_has_work(void)
{
- return 0;
+ int cpu, ret;
+ struct isol_info *i;
+
+ if (likely(current->isol_info == NULL))
+ return 0;
+
+ i = current->isol_info;
+ if (i->active_mask != ISOL_F_QUIESCE)
+ return 0;
+
+ if (!(i->quiesce_mask & ISOL_F_QUIESCE_VMSTATS))
+ return 0;
+
+ cpu = get_cpu();
+ ret = per_cpu(vmstat_dirty, cpu);
+ put_cpu();
+
+ return ret;
}
#else
Index: linux-2.6/kernel/task_isolation.c
===================================================================
--- linux-2.6.orig/kernel/task_isolation.c
+++ linux-2.6/kernel/task_isolation.c
@@ -23,6 +23,13 @@
void __tsk_isol_exit(struct task_struct *tsk)
{
+ struct isol_info *i;
+
+ i = tsk->isol_info;
+ if (!i)
+ return;
+
+ static_key_slow_dec(&vmstat_sync_enabled);
}
void __tsk_isol_free(struct task_struct *tsk)
@@ -41,6 +48,12 @@ static struct isol_info *tsk_isol_alloc_
if (unlikely(!info))
return ERR_PTR(-ENOMEM);
+ preempt_disable();
+ init_sync_vmstat();
+ preempt_enable();
+
+ static_key_slow_inc(&vmstat_sync_enabled);
+
return info;
}
next prev parent reply other threads:[~2021-11-12 12:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-12 12:35 [patch v7 00/10] extensible prctl task isolation interface and vmstat sync Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 01/10] add basic task isolation prctl interface Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 02/10] add prctl task isolation prctl docs and samples Marcelo Tosatti
2021-11-23 12:36 ` Frederic Weisbecker
2021-11-29 15:13 ` Marcelo Tosatti
2021-12-02 17:13 ` Frederic Weisbecker
2021-12-02 18:29 ` Marcelo Tosatti
2021-12-07 17:05 ` Marcelo Tosatti
2021-11-23 14:37 ` Frederic Weisbecker
2021-11-29 15:19 ` Marcelo Tosatti
2021-12-02 17:44 ` Frederic Weisbecker
2021-11-12 12:35 ` [patch v7 03/10] task isolation: sync vmstats on return to userspace Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 04/10] procfs: add per-pid task isolation state Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 05/10] task isolation: add hook to task exit Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 06/10] task isolation: sync vmstats conditional on changes Marcelo Tosatti
2021-11-12 12:35 ` Marcelo Tosatti [this message]
2021-11-12 12:35 ` [patch v7 08/10] KVM: x86: process isolation work from VM-entry code path Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 09/10] mm: vmstat: move need_update Marcelo Tosatti
2021-11-12 12:35 ` [patch v7 10/10] mm: vmstat_refresh: avoid queueing work item if cpu stats are clean Marcelo Tosatti
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