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From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
To: Nishanth Aravamudan <naravamudan@digitalocean.com>,
	Julien Desfossez <jdesfossez@digitalocean.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Vineeth Pillai <viremana@linux.microsoft.com>,
	Aaron Lu <aaron.lwe@gmail.com>,
	Aubrey Li <aubrey.intel@gmail.com>,
	tglx@linutronix.de, linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, torvalds@linux-foundation.org,
	fweisbec@gmail.com, keescook@chromium.org, kerrnel@google.com,
	Phil Auld <pauld@redhat.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	joel@joelfernandes.org, vineeth@bitbyteword.org,
	Chen Yu <yu.c.chen@intel.com>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Agata Gruza <agata.gruza@intel.com>,
	Antonio Gomez Iglesias <antonio.gomez.iglesias@intel.com>,
	graf@amazon.com, konrad.wilk@oracle.com, dfaggioli@suse.com,
	pjt@google.com, rostedt@goodmis.org, derkling@google.com,
	benbjiang@tencent.com,
	Alexandre Chartre <alexandre.chartre@oracle.com>,
	James.Bottomley@hansenpartnership.com, OWeisse@umich.edu,
	Dhaval Giani <dhaval.giani@oracle.com>,
	Junaid Shahid <junaids@google.com>,
	jsbarnes@google.com, chris.hyser@oracle.com,
	Aubrey Li <aubrey.li@linux.intel.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Tim Chen <tim.c.chen@intel.com>
Subject: [PATCH v8 -tip 20/26] sched: Release references to the per-task cookie on exit
Date: Mon, 19 Oct 2020 21:43:30 -0400	[thread overview]
Message-ID: <20201020014336.2076526-21-joel@joelfernandes.org> (raw)
In-Reply-To: <20201020014336.2076526-1-joel@joelfernandes.org>

During exit, we have to free the references to a cookie that might be shared by
many tasks. This commit therefore ensures when the task_struct is released, any
references to cookies that it holds are also released.

Tested-by: Julien Desfossez <jdesfossez@digitalocean.com>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
 include/linux/sched.h | 2 ++
 kernel/fork.c         | 1 +
 kernel/sched/core.c   | 8 ++++++++
 3 files changed, 11 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4cb76575afa8..eabd96beff92 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2079,12 +2079,14 @@ void sched_core_unsafe_exit(void);
 bool sched_core_wait_till_safe(unsigned long ti_check);
 bool sched_core_kernel_protected(void);
 int sched_core_share_pid(pid_t pid);
+void sched_tsk_free(struct task_struct *tsk);
 #else
 #define sched_core_unsafe_enter(ignore) do { } while (0)
 #define sched_core_unsafe_exit(ignore) do { } while (0)
 #define sched_core_wait_till_safe(ignore) do { } while (0)
 #define sched_core_kernel_protected(ignore) do { } while (0)
 #define sched_core_share_pid(pid_t pid) do { } while (0)
+#define sched_tsk_free(tsk) do { } while (0)
 #endif
 
 #endif
diff --git a/kernel/fork.c b/kernel/fork.c
index b9c289d0f4ef..a39248a02fdd 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -736,6 +736,7 @@ void __put_task_struct(struct task_struct *tsk)
 	exit_creds(tsk);
 	delayacct_tsk_free(tsk);
 	put_signal_struct(tsk->signal);
+	sched_tsk_free(tsk);
 
 	if (!profile_handoff_task(tsk))
 		free_task(tsk);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 42aa811eab14..61e1dcf11000 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9631,6 +9631,14 @@ static int cpu_core_tag_color_write_u64(struct cgroup_subsys_state *css,
 
 	return 0;
 }
+
+void sched_tsk_free(struct task_struct *tsk)
+{
+	if (!tsk->core_task_cookie)
+		return;
+	sched_core_put_task_cookie(tsk->core_task_cookie);
+	sched_core_put();
+}
 #endif
 
 static struct cftype cpu_legacy_files[] = {
-- 
2.29.0.rc1.297.gfa9743e501-goog


  parent reply	other threads:[~2020-10-20  1:45 UTC|newest]

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-20  1:43 [PATCH v8 -tip 00/26] Core scheduling Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 01/26] sched: Wrap rq::lock access Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 02/26] sched: Introduce sched_class::pick_task() Joel Fernandes (Google)
2020-10-22  7:59   ` Li, Aubrey
2020-10-22 15:25     ` Joel Fernandes
2020-10-23  5:25       ` Li, Aubrey
2020-10-23 21:47         ` Joel Fernandes
2020-10-24  2:48           ` Li, Aubrey
2020-10-24 11:10             ` Vineeth Pillai
2020-10-24 12:27               ` Vineeth Pillai
2020-10-24 23:48                 ` Li, Aubrey
2020-10-26  9:01                 ` Peter Zijlstra
2020-10-27  3:17                   ` Li, Aubrey
2020-10-27 14:19                   ` Joel Fernandes
2020-10-27 15:23                     ` Joel Fernandes
2020-10-27 14:14                 ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 03/26] sched: Core-wide rq->lock Joel Fernandes (Google)
2020-10-26 11:59   ` Peter Zijlstra
2020-10-27 16:27     ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 04/26] sched/fair: Add a few assertions Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 05/26] sched: Basic tracking of matching tasks Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 06/26] sched: Add core wide task selection and scheduling Joel Fernandes (Google)
2020-10-23 13:51   ` Peter Zijlstra
2020-10-23 13:54     ` Peter Zijlstra
2020-10-23 17:57       ` Joel Fernandes
2020-10-23 19:26         ` Peter Zijlstra
2020-10-23 21:31           ` Joel Fernandes
2020-10-26  8:28             ` Peter Zijlstra
2020-10-27 16:58               ` Joel Fernandes
2020-10-26  9:31             ` Peter Zijlstra
2020-11-05 18:50               ` Joel Fernandes
2020-11-05 22:07                 ` Joel Fernandes
2020-10-23 15:05   ` Peter Zijlstra
2020-10-23 17:59     ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 07/26] sched/fair: Fix forced idle sibling starvation corner case Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 08/26] sched/fair: Snapshot the min_vruntime of CPUs on force idle Joel Fernandes (Google)
2020-10-26 12:47   ` Peter Zijlstra
2020-10-28 15:29     ` Joel Fernandes
2020-10-28 18:39     ` Joel Fernandes
2020-10-29 16:59     ` Joel Fernandes
2020-10-29 18:24     ` Joel Fernandes
2020-10-29 18:59       ` Peter Zijlstra
2020-10-30  2:36         ` Joel Fernandes
2020-10-30  2:42           ` Joel Fernandes
2020-10-30  8:41             ` Peter Zijlstra
2020-10-31 21:41               ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 09/26] sched: Trivial forced-newidle balancer Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 10/26] sched: migration changes for core scheduling Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 11/26] irq_work: Cleanup Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 12/26] arch/x86: Add a new TIF flag for untrusted tasks Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 13/26] kernel/entry: Add support for core-wide protection of kernel-mode Joel Fernandes (Google)
2020-10-20  3:41   ` Randy Dunlap
2020-11-03  0:20     ` Joel Fernandes
2020-10-22  5:48   ` Li, Aubrey
2020-11-03  0:50     ` Joel Fernandes
2020-10-30 10:29   ` Alexandre Chartre
2020-11-03  1:20     ` Joel Fernandes
2020-11-06 16:57       ` Alexandre Chartre
2020-11-06 17:43         ` Joel Fernandes
2020-11-06 18:07           ` Alexandre Chartre
2020-11-10  9:35       ` Alexandre Chartre
2020-11-10 22:42         ` Joel Fernandes
2020-11-16 10:08           ` Alexandre Chartre
2020-11-16 14:50             ` Joel Fernandes
2020-11-16 15:43               ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 14/26] entry/idle: Enter and exit kernel protection during idle entry and exit Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 15/26] entry/kvm: Protect the kernel when entering from guest Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 16/26] sched: cgroup tagging interface for core scheduling Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 17/26] sched: Split the cookie and setup per-task cookie on fork Joel Fernandes (Google)
2020-11-04 22:30   ` chris hyser
2020-11-05 14:49     ` Joel Fernandes
2020-11-09 23:30     ` chris hyser
2020-10-20  1:43 ` [PATCH v8 -tip 18/26] sched: Add a per-thread core scheduling interface Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 19/26] sched: Add a second-level tag for nested CGroup usecase Joel Fernandes (Google)
2020-10-31  0:42   ` Josh Don
2020-11-03  2:54     ` Joel Fernandes
     [not found]   ` <6c07e70d-52f2-69ff-e1fa-690cd2c97f3d@linux.intel.com>
2020-11-05 15:52     ` Joel Fernandes
2020-10-20  1:43 ` Joel Fernandes (Google) [this message]
2020-11-04 21:50   ` [PATCH v8 -tip 20/26] sched: Release references to the per-task cookie on exit chris hyser
2020-11-05 15:46     ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 21/26] sched: Handle task addition to CGroup Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 22/26] sched/debug: Add CGroup node for printing group cookie if SCHED_DEBUG Joel Fernandes (Google)
2020-10-20  1:43 ` [PATCH v8 -tip 23/26] kselftest: Add tests for core-sched interface Joel Fernandes (Google)
2020-10-30 22:20   ` [PATCH] sched: Change all 4 space tabs to actual tabs John B. Wyatt IV
2020-10-20  1:43 ` [PATCH v8 -tip 24/26] sched: Move core-scheduler interfacing code to a new file Joel Fernandes (Google)
2020-10-26  1:05   ` Li, Aubrey
2020-11-03  2:58     ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 25/26] Documentation: Add core scheduling documentation Joel Fernandes (Google)
2020-10-20  3:36   ` Randy Dunlap
2020-11-12 16:11     ` Joel Fernandes
2020-10-20  1:43 ` [PATCH v8 -tip 26/26] sched: Debug bits Joel Fernandes (Google)
2020-10-30 13:26 ` [PATCH v8 -tip 00/26] Core scheduling Ning, Hongyu
2020-11-06  2:58   ` Li, Aubrey
2020-11-06 17:54     ` Joel Fernandes
2020-11-09  6:04       ` Li, Aubrey
2020-11-06 20:55 ` [RFT for v9] (Was Re: [PATCH v8 -tip 00/26] Core scheduling) Joel Fernandes
2020-11-13  9:22   ` Ning, Hongyu
2020-11-13 10:01     ` Ning, Hongyu

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