From 0d6526f82c3cdefcca47f73f5fc08dc6f335eac6 Mon Sep 17 00:00:00 2001 From: Tim Chen Date: Mon, 21 Sep 2026 17:37:22 -0700 Subject: sched/cache: Keep nr_pref_llc_running in the runnable domain, to fix LLC mis-scheduling bug alb_break_llc() decides whether to break LLC preference during active load balance. It does so by testing that every runnable fair task on the source rq prefers its LLC: env->src_rq->nr_pref_llc_running == env->src_rq->cfs.h_nr_runnable But the two counters cover different sets. nr_pref_llc_running is updated in account_llc_enqueue()/account_llc_dequeue(), next to cfs_rq->nr_queued, so it follows queued tasks. h_nr_runnable is updated in set_delayed()/ clear_delayed() and drops delay-dequeued tasks. So under DELAY_DEQUEUE, a preferring task that goes to sleep stays counted in nr_pref_llc_running while h_nr_runnable falls. The equality then breaks, alb_break_llc() returns false, and active balance is free to pull a task off its preferred LLC. Active balance only moves runnable tasks, and this is the only LLC check it consults: once the stopper runs, LBF_ACTIVE_LB skips the per-task test in can_migrate_task(). The runnable set is the one we want. Fix it on the counter side. A task should be counted in nr_pref_llc_running exactly while it is both queued on its preferred LLC (pref_llc_queued) and runnable (!sched_delayed). Define that membership once in task_pref_llc_runnable(), and adjust the counter only through pref_llc_running_inc()/pref_llc_running_dec() from the four sites that change either input: account_llc_enqueue(), account_llc_dequeue(), set_delayed() and clear_delayed(). Gating every update on the same predicate keeps the delay, wake and dequeue paths from double-counting or underflowing; see the comments at those sites for the ordering. nr_llc_running and sd->llc_counts are not touched and stay on queued semantics. Fixes: 714059f79ff0 ("sched/cache: Handle moving single tasks to/from their preferred LLC") Closes: https://lore.kernel.org/lkml/20260827135000.735138-1-zhanxusheng@xiaomi.com/ Reported-by: Zhan Xusheng Suggested-by: Chen Yu Signed-off-by: Tim Chen Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Reviewed-by: Kayra Cizmeci Cc: # v7.2.x Link: https://patch.msgid.link/06af61afedac32e6477f57feb4d658f6c411c3af.1790035273.git.tim.c.chen@linux.intel.com --- drivers/phy/qualcomm/Makefile | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 drivers/phy/qualcomm/Makefile (limited to 'drivers/phy/qualcomm/Makefile') diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile new file mode 100644 index 000000000..8bf887d58 --- /dev/null +++ b/drivers/phy/qualcomm/Makefile @@ -0,0 +1,28 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_PHY_ATH79_USB) += phy-ath79-usb.o +obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o +obj-$(CONFIG_PHY_QCOM_EDP) += phy-qcom-edp.o +obj-$(CONFIG_PHY_QCOM_IPQ4019_USB) += phy-qcom-ipq4019-usb.o +obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o +obj-$(CONFIG_PHY_QCOM_M31_USB) += phy-qcom-m31.o +obj-$(CONFIG_PHY_QCOM_M31_EUSB) += phy-qcom-m31-eusb2.o +obj-$(CONFIG_PHY_QCOM_PCIE2) += phy-qcom-pcie2.o + +obj-$(CONFIG_PHY_QCOM_QMP_COMBO) += phy-qcom-qmp-combo.o phy-qcom-qmp-usbc.o +obj-$(CONFIG_PHY_QCOM_QMP_PCIE) += phy-qcom-qmp-pcie.o +obj-$(CONFIG_PHY_QCOM_QMP_PCIE_MULTIPHY) += phy-qcom-qmp-pcie-multiphy.o +obj-$(CONFIG_PHY_QCOM_QMP_PCIE_8996) += phy-qcom-qmp-pcie-msm8996.o +obj-$(CONFIG_PHY_QCOM_QMP_UFS) += phy-qcom-qmp-ufs.o +obj-$(CONFIG_PHY_QCOM_QMP_USB) += phy-qcom-qmp-usb.o +obj-$(CONFIG_PHY_QCOM_QMP_USB_LEGACY) += phy-qcom-qmp-usb-legacy.o + +obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o +obj-$(CONFIG_PHY_QCOM_EUSB2_REPEATER) += phy-qcom-eusb2-repeater.o +obj-$(CONFIG_PHY_QCOM_UNIPHY_PCIE_28LP) += phy-qcom-uniphy-pcie-28lp.o +obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o +obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o +obj-$(CONFIG_PHY_QCOM_USB_HS_28NM) += phy-qcom-usb-hs-28nm.o +obj-$(CONFIG_PHY_QCOM_USB_SS) += phy-qcom-usb-ss.o +obj-$(CONFIG_PHY_QCOM_USB_SNPS_FEMTO_V2)+= phy-qcom-snps-femto-v2.o +obj-$(CONFIG_PHY_QCOM_IPQ806X_USB) += phy-qcom-ipq806x-usb.o +obj-$(CONFIG_PHY_QCOM_SGMII_ETH) += phy-qcom-sgmii-eth.o -- cgit v1.3.1