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/input/joystick/Makefile | 43 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 drivers/input/joystick/Makefile (limited to 'drivers/input/joystick/Makefile') diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile new file mode 100644 index 000000000..9976f596a --- /dev/null +++ b/drivers/input/joystick/Makefile @@ -0,0 +1,43 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the input core drivers. +# + +# Each configuration option enables a list of files. + +obj-$(CONFIG_JOYSTICK_A3D) += a3d.o +obj-$(CONFIG_JOYSTICK_ADC) += adc-joystick.o +obj-$(CONFIG_JOYSTICK_ADI) += adi.o +obj-$(CONFIG_JOYSTICK_AMIGA) += amijoy.o +obj-$(CONFIG_JOYSTICK_AS5011) += as5011.o +obj-$(CONFIG_JOYSTICK_ANALOG) += analog.o +obj-$(CONFIG_JOYSTICK_COBRA) += cobra.o +obj-$(CONFIG_JOYSTICK_DB9) += db9.o +obj-$(CONFIG_JOYSTICK_FSIA6B) += fsia6b.o +obj-$(CONFIG_JOYSTICK_GAMECON) += gamecon.o +obj-$(CONFIG_JOYSTICK_GF2K) += gf2k.o +obj-$(CONFIG_JOYSTICK_GRIP) += grip.o +obj-$(CONFIG_JOYSTICK_GRIP_MP) += grip_mp.o +obj-$(CONFIG_JOYSTICK_GUILLEMOT) += guillemot.o +obj-$(CONFIG_JOYSTICK_IFORCE) += iforce/ +obj-$(CONFIG_JOYSTICK_INTERACT) += interact.o +obj-$(CONFIG_JOYSTICK_JOYDUMP) += joydump.o +obj-$(CONFIG_JOYSTICK_MAGELLAN) += magellan.o +obj-$(CONFIG_JOYSTICK_MAPLE) += maplecontrol.o +obj-$(CONFIG_JOYSTICK_N64) += n64joy.o +obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o +obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o +obj-$(CONFIG_JOYSTICK_QWIIC) += qwiic-joystick.o +obj-$(CONFIG_JOYSTICK_SEESAW) += adafruit-seesaw.o +obj-$(CONFIG_JOYSTICK_SENSEHAT) += sensehat-joystick.o +obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o +obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o +obj-$(CONFIG_JOYSTICK_SPACEORB) += spaceorb.o +obj-$(CONFIG_JOYSTICK_STINGER) += stinger.o +obj-$(CONFIG_JOYSTICK_TMDC) += tmdc.o +obj-$(CONFIG_JOYSTICK_TURBOGRAFX) += turbografx.o +obj-$(CONFIG_JOYSTICK_TWIDJOY) += twidjoy.o +obj-$(CONFIG_JOYSTICK_WARRIOR) += warrior.o +obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o +obj-$(CONFIG_JOYSTICK_XPAD) += xpad.o +obj-$(CONFIG_JOYSTICK_ZHENHUA) += zhenhua.o -- cgit v1.3.1