From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Song Muchun <smuchun@gmail.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Mike Galbraith <efault@gmx.de>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 06/13] sched/fair: Fix the min_vruntime update logic in dequeue_entity()
Date: Tue, 30 Oct 2018 09:29:16 -0400 [thread overview]
Message-ID: <20181030132923.218124-6-sashal@kernel.org> (raw)
In-Reply-To: <20181030132923.218124-1-sashal@kernel.org>
From: Song Muchun <smuchun@gmail.com>
[ Upstream commit 9845c49cc9bbb317a0bc9e9cf78d8e09d54c9af0 ]
The comment and the code around the update_min_vruntime() call in
dequeue_entity() are not in agreement.
From commit:
b60205c7c558 ("sched/fair: Fix min_vruntime tracking")
I think that we want to update min_vruntime when a task is sleeping/migrating.
So, the check is inverted there - fix it.
Signed-off-by: Song Muchun <smuchun@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: b60205c7c558 ("sched/fair: Fix min_vruntime tracking")
Link: http://lkml.kernel.org/r/20181014112612.2614-1-smuchun@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f81adb476c03..dfec7d4789fa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3502,7 +3502,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
* put back on, and if we advance min_vruntime, we'll be placed back
* further than we started -- ie. we'll be penalized.
*/
- if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) == DEQUEUE_SAVE)
+ if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) != DEQUEUE_SAVE)
update_min_vruntime(cfs_rq);
}
--
2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Song Muchun <smuchun@gmail.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Mike Galbraith <efault@gmx.de>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 06/13] sched/fair: Fix the min_vruntime update logic in dequeue_entity()
Date: Tue, 30 Oct 2018 09:29:16 -0400 [thread overview]
Message-ID: <20181030132923.218124-6-sashal@kernel.org> (raw)
In-Reply-To: <20181030132923.218124-1-sashal@kernel.org>
From: Song Muchun <smuchun@gmail.com>
[ Upstream commit 9845c49cc9bbb317a0bc9e9cf78d8e09d54c9af0 ]
The comment and the code around the update_min_vruntime() call in
dequeue_entity() are not in agreement.
>From commit:
b60205c7c558 ("sched/fair: Fix min_vruntime tracking")
I think that we want to update min_vruntime when a task is sleeping/migrating.
So, the check is inverted there - fix it.
Signed-off-by: Song Muchun <smuchun@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: b60205c7c558 ("sched/fair: Fix min_vruntime tracking")
Link: http://lkml.kernel.org/r/20181014112612.2614-1-smuchun@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f81adb476c03..dfec7d4789fa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3502,7 +3502,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
* put back on, and if we advance min_vruntime, we'll be placed back
* further than we started -- ie. we'll be penalized.
*/
- if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) == DEQUEUE_SAVE)
+ if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) != DEQUEUE_SAVE)
update_min_vruntime(cfs_rq);
}
--
2.17.1
next prev parent reply other threads:[~2018-10-30 13:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-30 13:29 [PATCH AUTOSEL 4.9 01/13] bpf: do not blindly change rlimit in reuseport net selftest Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 02/13] Revert "perf tools: Fix PMU term format max value calculation" Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 03/13] xfrm: policy: use hlist rcu variants on insert Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 04/13] sparc: Fix single-pcr perf event counter management Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 05/13] sparc64: Make proc_id signed Sasha Levin
2018-10-30 13:29 ` Sasha Levin [this message]
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 06/13] sched/fair: Fix the min_vruntime update logic in dequeue_entity() Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 07/13] perf cpu_map: Align cpu map synthesized events properly Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 08/13] x86/fpu: Remove second definition of fpu in __fpu__restore_sig() Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 09/13] net: qla3xxx: Remove overflowing shift statement Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 10/13] r8169: fix NAPI handling under high load Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 11/13] selftests: ftrace: Add synthetic event syntax testcase Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 12/13] net: fix pskb_trim_rcsum_slow() with odd trim offset Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 13/13] i2c: rcar: cleanup DMA for all kinds of failure Sasha Levin
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