linux-kernel - [tip: sched/core] sched/fair: Separate se->vlag from se->vprot

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Message-ID: <176569839784.498.14081344283899173849.tip-bot2@tip-bot2>
Date: Sun, 14 Dec 2025 07:46:37 -0000
From: "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc:
 Ingo Molnar <mingo@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Separate se->vlag from se->vprot

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     6b6d09f274bd6e5bed2751b3cab23e64f19c9e59
Gitweb:        https://git.kernel.org/tip/6b6d09f274bd6e5bed2751b3cab23e64f19c9e59
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Wed, 26 Nov 2025 05:31:28 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sun, 14 Dec 2025 08:25:02 +01:00

sched/fair: Separate se->vlag from se->vprot

There's no real space concerns here and keeping these fields
in a union makes reading (and tracing) the scheduler code harder.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://patch.msgid.link/20251201064647.1851919-4-mingo@kernel.org
---
 include/linux/sched.h | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d395f28..bf96a7d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -586,15 +586,10 @@ struct sched_entity {
 	u64				sum_exec_runtime;
 	u64				prev_sum_exec_runtime;
 	u64				vruntime;
-	union {
-		/*
-		 * When !@...rq this field is vlag.
-		 * When cfs_rq->curr == se (which implies @on_rq)
-		 * this field is vprot. See protect_slice().
-		 */
-		s64                     vlag;
-		u64                     vprot;
-	};
+	/* Approximated virtual lag: */
+	s64				vlag;
+	/* 'Protected' deadline, to give out minimum quantums: */
+	u64				vprot;
 	u64				slice;
 
 	u64				nr_migrations;