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>,
Oscar Shiang <oscar0225@livemail.tw>,
Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch v11 13/13] task isolation: only TIF_TASK_ISOL if task isolation is enabled
Date: Fri, 04 Feb 2022 14:35:50 -0300 [thread overview]
Message-ID: <20220204173555.047244789@fedora.localdomain> (raw)
In-Reply-To: 20220204173537.429902988@fedora.localdomain
This avoids processing of TIF_TASK_ISOL, when returning to userspace,
for tasks which do not have task isolation configured.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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 +5,8 @@
#ifdef CONFIG_TASK_ISOLATION
+#include <uapi/linux/prctl.h>
+
struct task_isol_info {
/* Which features have been configured */
u64 conf_mask;
@@ -51,6 +53,24 @@ int __copy_task_isol(struct task_struct
void task_isol_exit_to_user_mode(void);
+static inline bool task_isol_quiesce_activated(struct task_struct *tsk,
+ u64 quiesce_mask)
+{
+ struct task_isol_info *i;
+
+ i = tsk->task_isol_info;
+ if (!i)
+ return false;
+
+ if (i->active_mask != ISOL_F_QUIESCE)
+ return false;
+
+ if ((i->quiesce_mask & quiesce_mask) == quiesce_mask)
+ return true;
+
+ return false;
+}
+
#else
static inline void task_isol_exit_to_user_mode(void)
@@ -105,6 +125,12 @@ static inline int prctl_task_isol_activa
return -EOPNOTSUPP;
}
+static inline bool task_isol_quiesce_activated(struct task_struct *tsk,
+ u64 quiesce_mask)
+{
+ return false;
+}
+
#endif /* CONFIG_TASK_ISOLATION */
#endif /* __LINUX_TASK_ISOL_H */
Index: linux-2.6/mm/vmstat.c
===================================================================
--- linux-2.6.orig/mm/vmstat.c
+++ linux-2.6/mm/vmstat.c
@@ -28,6 +28,7 @@
#include <linux/mm_inline.h>
#include <linux/page_ext.h>
#include <linux/page_owner.h>
+#include <linux/task_isolation.h>
#include "internal.h"
@@ -344,7 +345,8 @@ static inline void mark_vmstat_dirty(voi
return;
raw_cpu_write(vmstat_dirty, true);
- set_thread_flag(TIF_TASK_ISOL);
+ if (task_isol_quiesce_activated(current, ISOL_F_QUIESCE_VMSTATS))
+ set_thread_flag(TIF_TASK_ISOL);
}
void init_sync_vmstat(void)
next prev parent reply other threads:[~2022-02-04 17:37 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-04 17:35 [patch v11 00/13] extensible prctl task isolation interface and vmstat sync Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 01/13] s390: add support for TIF_TASK_ISOL Marcelo Tosatti
2022-02-07 11:40 ` Sven Schnelle
2022-02-04 17:35 ` [patch v11 02/13] x86: " Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 03/13] add basic task isolation prctl interface Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 04/13] add prctl task isolation prctl docs and samples Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 05/13] task isolation: sync vmstats on return to userspace Marcelo Tosatti
2022-02-07 14:57 ` Frederic Weisbecker
2022-02-07 15:16 ` Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 06/13] procfs: add per-pid task isolation state Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 07/13] task isolation: sync vmstats conditional on changes Marcelo Tosatti
2022-02-07 15:19 ` Frederic Weisbecker
2022-03-10 16:30 ` Marcelo Tosatti
2022-02-07 15:29 ` Frederic Weisbecker
2022-02-04 17:35 ` [patch v11 08/13] task isolation: enable return to userspace processing Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 09/13] task isolation: add preempt notifier to sync per-CPU vmstat dirty info to thread info Marcelo Tosatti
2022-02-07 15:36 ` Frederic Weisbecker
2022-02-04 17:35 ` [patch v11 10/13] KVM: x86: process isolation work from VM-entry code path Marcelo Tosatti
2022-02-07 15:47 ` Frederic Weisbecker
2022-03-10 16:35 ` Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 11/13] mm: vmstat: move need_update Marcelo Tosatti
2022-02-04 17:35 ` [patch v11 12/13] mm: vmstat_refresh: avoid queueing work item if cpu stats are clean Marcelo Tosatti
2022-02-04 17:35 ` Marcelo Tosatti [this message]
2022-02-07 15:38 ` [patch v11 13/13] task isolation: only TIF_TASK_ISOL if task isolation is enabled Frederic Weisbecker
2022-02-19 8:02 ` [patch v11 00/13] extensible prctl task isolation interface and vmstat sync Oscar Shiang
2022-02-23 17:31 ` Marcelo Tosatti
2022-03-08 6:32 ` Oscar Shiang
2022-03-08 13:12 ` Marcelo Tosatti
2022-03-09 15:31 ` Oscar Shiang
2022-03-08 7:20 ` Oscar Shiang
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