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Fri, 02 Oct 2026 08:46:44 -0700 (PDT) Received: from localhost.localdomain ([202.8.105.115]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e49f6d9a88sm9785075ad.53.2026.10.02.08.46.40 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 02 Oct 2026 08:46:43 -0700 (PDT) From: Jemmy Wong To: Tim Chen , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot Cc: Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , linux-kernel@vger.kernel.org Subject: [PATCH v2 0/3] sched/fair: Update decision matrix and rename pinned-task group state Date: Fri, 2 Oct 2026 23:46:31 +0800 Message-ID: <20261002154634.71878-1-jemmywong512@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Patch 1 updates the group-type decision matrix above sched_balance_find_src_group(), which was never extended for group_smt_balance (fee1759e4f04) and group_llc_balance (f38cc2f0d8a3). Patches 2-3 rename the state that records balancing failures caused by cpus_ptr-pinned tasks. Since commit 6263322c5e8f ("sched/fair: Rewrite group_imb trigger") it is an affinity flag, not a load-skew measure, yet it kept the names group_imbalanced and sgc->imbalance, which suggest a load skew and are easily confused with env->imbalance. They become group_pinned_imb and sgc->pinned_imb. Patch 1 does not depend on patches 2-3. No functional change. Changes in v2: - Patch 1: llc_balance vs. local has_spare is "force", not "nr_idle" (Tim Chen); reword the changelog accordingly. - Patch 2: Rename to group_pinned_imb instead of group_pinned_task (Tim Chen). - Patch 3: Rename sgc->pinned_task to sgc->pinned_imb and the reader to sg_pinned_imb(), to match. v1: https://lore.kernel.org/all/20260928042018.10618-1-jemmywong512@gmail.com/ Jemmy Wong (3): sched/fair: Add smt_balance and llc_balance to the decision matrix sched/fair: Rename group_imbalanced to group_pinned_imb sched/fair: Rename sgc->imbalance to sgc->pinned_imb kernel/sched/fair.c | 66 +++++++++++++++++++++++--------------------- kernel/sched/sched.h | 6 +++- 2 files changed, 39 insertions(+), 33 deletions(-) -- 2.54.0 (Apple Git-157)