c17ee635fd3a482b2ad2bf5e269755c2eae5f25e - Merge drm/drm-fixes into drm-misc-fixes

Mon, 23 Feb 2026 09:09:45 +0000

Merge drm/drm-fixes into drm-misc-fixes7.0-rc1 was just released, let's merge it to kick the new release cycle.Signed-off-by: Maxime Ripard List of files: /linux/Documentation/userspace-api/rseq.rst

36ae1c45b2cede43ab2fc679b450060bbf119f1b - Merge tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 10 Feb 2026 20:50:10 +0000

Merge tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull scheduler updates from Ingo Molnar: "Scheduler Kconfig space updates: - Further consolidate configurable preemption modes (Peter Zijlstra) Reduce the number of architectures that are allowed to offer PREEMPT_NONE and PREEMPT_VOLUNTARY, reducing the number of preemption models from four to just two: 'full' and 'lazy' on up-to-date architectures (arm64, loongarch, powerpc, riscv, s390, x86). None and voluntary are only available as legacy features on platforms that don't implement lazy preemption yet, or which don't even support preemption. The goal is to eventually remove cond_resched() and voluntary preemption altogether. RSEQ based 'scheduler time slice extension' support (Thomas Gleixner and Peter Zijlstra): This allows a thread to request a time slice extension when it enters a critical section to avoid contention on a resource when the thread is scheduled out inside of the critical section. - Add fields and constants for time slice extension - Provide static branch for time slice extensions - Add statistics for time slice extensions - Add prctl() to enable time slice extensions - Implement sys_rseq_slice_yield() - Implement syscall entry work for time slice extensions - Implement time slice extension enforcement timer - Reset slice extension when scheduled - Implement rseq_grant_slice_extension() - entry: Hook up rseq time slice extension - selftests: Implement time slice extension test - Allow registering RSEQ with slice extension - Move slice_ext_nsec to debugfs - Lower default slice extension - selftests/rseq: Add rseq slice histogram script Scheduler performance/scalability improvements: - Update rq->avg_idle when a task is moved to an idle CPU, which improves the scalability of various workloads (Shubhang Kaushik) - Reorder fields in 'struct rq' for better caching (Blake Jones) - Fair scheduler SMP NOHZ balancing code speedups (Shrikanth Hegde): - Move checking for nohz cpus after time check - Change likelyhood of nohz.nr_cpus - Remove nohz.nr_cpus and use weight of cpumask instead - Avoid false sharing for sched_clock_irqtime (Wangyang Guo) - Cleanups (Yury Norov): - Drop useless cpumask_empty() in find_energy_efficient_cpu() - Simplify task_numa_find_cpu() - Use cpumask_weight_and() in sched_balance_find_dst_group() DL scheduler updates: - Add a deadline server for sched_ext tasks (by Andrea Righi and Joel Fernandes, with fixes by Peter Zijlstra) RT scheduler updates: - Skip currently executing CPU in rto_next_cpu() (Chen Jinghuang) Entry code updates and performance improvements (Jinjie Ruan) This is part of the scheduler tree in this cycle due to inter- dependencies with the RSEQ based time slice extension work: - Remove unused syscall argument from syscall_trace_enter() - Rework syscall_exit_to_user_mode_work() for architecture reuse - Add arch_ptrace_report_syscall_entry/exit() - Inline syscall_exit_work() and syscall_trace_enter() Scheduler core updates (Peter Zijlstra): - Rework sched_class::wakeup_preempt() and rq_modified_*() - Avoid rq->lock bouncing in sched_balance_newidle() - Rename rcu_dereference_check_sched_domain() => rcu_dereference_sched_domain() - : Add the __signed_scalar_typeof() helper Fair scheduler updates/refactoring (Peter Zijlstra and Ingo Molnar): - Fold the sched_avg update - Change rcu_dereference_check_sched_domain() to rcu-sched - Switch to rcu_dereference_all() - Remove superfluous rcu_read_lock() - Limit hrtick work - Join two #ifdef CONFIG_FAIR_GROUP_SCHED blocks - Clean up comments in 'struct cfs_rq' - Separate se->vlag from se->vprot - Rename cfs_rq::avg_load to cfs_rq::sum_weight - Rename cfs_rq::avg_vruntime to ::sum_w_vruntime & helper functions - Introduce and use the vruntime_cmp() and vruntime_op() wrappers for wrapped-signed aritmetics - Sort out 'blocked_load*' namespace noise Scheduler debugging code updates: - Export hidden tracepoints to modules (Gabriele Monaco) - Convert copy_from_user() + kstrtouint() to kstrtouint_from_user() (Fushuai Wang) - Add assertions to QUEUE_CLASS (Peter Zijlstra) - hrtimer: Fix tracing oddity (Thomas Gleixner) Misc fixes and cleanups: - Re-evaluate scheduling when migrating queued tasks out of throttled cgroups (Zicheng Qu) - Remove task_struct->faults_disabled_mapping (Christoph Hellwig) - Fix math notation errors in avg_vruntime comment (Zhan Xusheng) - sched/cpufreq: Use %pe format for PTR_ERR() printing (zenghongling)"* tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits) sched: Re-evaluate scheduling when migrating queued tasks out of throttled cgroups sched/cpufreq: Use %pe format for PTR_ERR() printing sched/rt: Skip currently executing CPU in rto_next_cpu() sched/clock: Avoid false sharing for sched_clock_irqtime selftests/sched_ext: Add test for DL server total_bw consistency selftests/sched_ext: Add test for sched_ext dl_server sched/debug: Fix dl_server (re)start conditions sched/debug: Add support to change sched_ext server params sched_ext: Add a DL server for sched_ext tasks sched/debug: Stop and start server based on if it was active sched/debug: Fix updating of ppos on server write ops sched/deadline: Clear the defer params entry: Inline syscall_exit_work() and syscall_trace_enter() entry: Add arch_ptrace_report_syscall_entry/exit() entry: Rework syscall_exit_to_user_mode_work() for architecture reuse entry: Remove unused syscall argument from syscall_trace_enter() sched: remove task_struct->faults_disabled_mapping sched: Update rq->avg_idle when a task is moved to an idle CPU selftests/rseq: Add rseq slice histogram script hrtimer: Fix trace oddity ... List of files: /linux/Documentation/userspace-api/rseq.rst

bb332a9e5a057d2cb9b90e307b26cce9b1f6f660 - selftests/rseq: Add rseq slice histogram script

Wed, 21 Jan 2026 14:10:29 +0000

selftests/rseq: Add rseq slice histogram scriptA script that processes trace-cmd data and generates a histogram ofrseq slice_ext durations for the recorded workload.Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260121143208.340549136@infradead.org List of files: /linux/Documentation/userspace-api/rseq.rst

21c0e92d0681fbd10ac024311bd09bca439e0bb1 - rseq: Lower default slice extension

Wed, 21 Jan 2026 13:25:04 +0000

rseq: Lower default slice extensionChange the minimum slice extension to 5 usec.Since slice_test selftest reaches a staggering ~350 nsec extension:Task: slice_test Mean: 350.266 ns Latency (us) | Count ------------------------------ EXPIRED | 238 0 us | 143189 1 us | 167 2 us | 26 3 us | 11 4 us | 28 5 us | 31 6 us | 22 7 us | 23 8 us | 32 9 us | 16 10 us | 35Lower the minimal (and default) value to 5 usecs -- which is still massive.Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260121143208.073200729@infradead.org List of files: /linux/Documentation/userspace-api/rseq.rst

e1d7f54900f1e1d3003a85b78cd7105a64203ff7 - rseq: Move slice_ext_nsec to debugfs

Wed, 21 Jan 2026 13:21:51 +0000

rseq: Move slice_ext_nsec to debugfsMove changing the slice ext duration to debugfs, a sliglty less permanentinterface.Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260121143207.923520192@infradead.org List of files: /linux/Documentation/userspace-api/rseq.rst

d7a5da7a0f7fa7ff081140c4f6f971db98882703 - rseq: Add fields and constants for time slice extension

Mon, 15 Dec 2025 16:52:04 +0000

rseq: Add fields and constants for time slice extensionAside of a Kconfig knob add the following items: - Two flag bits for the rseq user space ABI, which allow user space to query the availability and enablement without a syscall. - A new member to the user space ABI struct rseq, which is going to be used to communicate request and grant between kernel and user space. - A rseq state struct to hold the kernel state of this - Documentation of the new mechanismSigned-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20251215155708.669472597@linutronix.de List of files: /linux/Documentation/userspace-api/rseq.rst

Changes in rseq.rst

c17ee635fd3a482b2ad2bf5e269755c2eae5f25e - Merge drm/drm-fixes into drm-misc-fixes

36ae1c45b2cede43ab2fc679b450060bbf119f1b - Merge tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

bb332a9e5a057d2cb9b90e307b26cce9b1f6f660 - selftests/rseq: Add rseq slice histogram script

21c0e92d0681fbd10ac024311bd09bca439e0bb1 - rseq: Lower default slice extension

e1d7f54900f1e1d3003a85b78cd7105a64203ff7 - rseq: Move slice_ext_nsec to debugfs

d7a5da7a0f7fa7ff081140c4f6f971db98882703 - rseq: Add fields and constants for time slice extension