mirror/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Files
62dcbab8b0ef21729532600039fd514c09407092
linux/kernel
History
Tejun Heo 62dcbab8b0 sched_ext: Avoid live-locking bypass mode switching 
A poorly behaving BPF scheduler can live-lock the system by e.g. incessantly
banging on the same DSQ on a large NUMA system to the point where switching
to the bypass mode can take a long time. Turning on the bypass mode requires
dequeueing and re-enqueueing currently runnable tasks, if the DSQs that they
are on are live-locked, this can take tens of seconds cascading into other
failures. This was observed on 2 x Intel Sapphire Rapids machines with 224
logical CPUs.

Inject artifical delays while the bypass mode is switching to guarantee
timely completion.

While at it, move __scx_ops_bypass_lock into scx_ops_bypass() and rename it
to bypass_lock.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Valentin Andrei <vandrei@meta.com>
Reported-by: Patrick Lu <patlu@meta.com>
2024-11-08 10:42:13 -10:00
..
bpf
Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-09-23 09:35:36 -07:00
cgroup
Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-09-23 09:35:36 -07:00
configs
tinyconfig: remove unnecessary 'is not set' for choice blocks
2024-09-01 20:34:38 +09:00
debug
kdb: Get rid of redundant kdb_curr_task()
2024-06-21 15:49:29 +01:00
dma
dma-mapping: report unlimited DMA addressing in IOMMU DMA path
2024-09-23 08:38:56 +02:00
entry
treewide: context_tracking: Rename CONTEXT_* into CT_STATE_*
2024-07-29 07:33:10 +05:30
events
Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-09-23 09:35:36 -07:00
futex
fault-inject: improve build for CONFIG_FAULT_INJECTION=n
2024-09-01 20:43:33 -07:00
gcov
gcov: add support for GCC 14
2024-06-15 10:43:06 -07:00
irq
Merge tag 'pci-v6.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
2024-09-23 12:47:06 -07:00
kcsan
kcsan: Use min() to fix Coccinelle warning
2024-08-01 16:40:44 -07:00
livepatch
livepatch: Replace snprintf() with sysfs_emit()
2024-07-02 16:56:18 +02:00
locking
Merge tag 'mm-nonmm-stable-2024-09-21-07-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-09-21 08:20:50 -07:00
module
Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-09-23 09:35:36 -07:00
power
PM: hibernate: Remove unused stub for saveable_highmem_page()
2024-09-10 20:11:40 +02:00
printk
Merge tag 'drm-next-2024-09-19' of https://gitlab.freedesktop.org/drm/kernel
2024-09-19 10:18:15 +02:00
rcu
Merge tag 'slab-for-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab
2024-09-18 08:53:53 +02:00
sched
sched_ext: Avoid live-locking bypass mode switching
2024-11-08 10:42:13 -10:00
time
Merge tag 'sched-core-2024-09-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-09-19 15:55:58 +02:00
trace
Merge tag 'trace-ring-buffer-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2024-09-22 09:47:16 -07:00
.gitignore
…
acct.c
kernel misc: Remove the now superfluous sentinel elements from ctl_table array
2024-04-24 09:43:53 +02:00
async.c
async: Use a dedicated unbound workqueue with raised min_active
2024-02-09 11:13:59 -10:00
audit_fsnotify.c
…
audit_tree.c
fsnotify: create a wrapper fsnotify_find_inode_mark()
2024-04-04 16:24:16 +02:00
audit_watch.c
fsnotify: create a wrapper fsnotify_find_inode_mark()
2024-04-04 16:24:16 +02:00
audit.c
audit: Make use of str_enabled_disabled() helper
2024-09-03 16:35:16 -04:00
audit.h
…
auditfilter.c
audit: use task_tgid_nr() instead of task_pid_nr()
2024-08-28 16:48:28 -04:00
auditsc.c
audit: use task_tgid_nr() instead of task_pid_nr()
2024-08-28 16:48:28 -04:00
backtracetest.c
backtracetest: add MODULE_DESCRIPTION()
2024-06-24 22:24:55 -07:00
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-04-29 08:29:29 -07:00
capability.c
…
cfi.c
…
compat.c
…
configs.c
…
context_tracking.c
context_tracking, rcu: Rename rcu_dyntick trace event into rcu_watching
2024-08-15 21:30:43 +05:30
cpu_pm.c
…
cpu.c
Merge tag 'timers-core-2024-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-09-17 07:25:37 +02:00
crash_core.c
Document/kexec: generalize crash hotplug description
2024-09-01 20:43:37 -07:00
crash_reserve.c
crash: fix crash memory reserve exceed system memory bug
2024-09-01 20:43:30 -07:00
cred.c
cred: Use KMEM_CACHE() instead of kmem_cache_create()
2024-02-23 17:33:31 -05:00
delayacct.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
dma.c
…
elfcorehdr.c
crash: remove dependency of FA_DUMP on CRASH_DUMP
2024-02-23 17:48:22 -08:00
exec_domain.c
…
exit.c
Merge tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-09-21 07:29:05 -07:00
exit.h
…
extable.c
…
fail_function.c
…
fork.c
Merge tag 'sched_ext-for-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext
2024-09-21 09:44:57 -07:00
freezer.c
sched,freezer: Mark TASK_FROZEN special
2024-08-17 11:06:44 +02:00
gen_kheaders.sh
kheaders: use command -v to test for existence of cpio
2024-05-30 01:13:20 +09:00
groups.c
…
hung_task.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
iomem.c
…
irq_work.c
…
jump_label.c
jump_label: Fix the fix, brown paper bags galore
2024-07-31 12:57:39 +02:00
kallsyms_internal.h
kallsyms: get rid of code for absolute kallsyms
2024-07-20 16:33:21 +09:00
kallsyms_selftest.c
kallsyms: Match symbols exactly with CONFIG_LTO_CLANG
2024-08-15 09:33:35 -07:00
kallsyms_selftest.h
…
kallsyms.c
kallsyms: Match symbols exactly with CONFIG_LTO_CLANG
2024-08-15 09:33:35 -07:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.kexec
crash: clean up kdump related config items
2024-02-23 17:48:22 -08:00
Kconfig.locks
…
Kconfig.preempt
sched_ext: Build fix on !CONFIG_STACKTRACE[_SUPPORT]
2024-08-01 07:08:01 -10:00
kcov.c
Merge tag 'x86-build-2024-09-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-09-17 12:40:34 +02:00
kexec_core.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
kexec_elf.c
…
kexec_file.c
kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y
2024-09-01 17:59:01 -07:00
kexec_internal.h
kexec: use atomic_try_cmpxchg_acquire() in kexec_trylock()
2024-09-01 20:43:23 -07:00
kexec.c
crash: add a new kexec flag for hotplug support
2024-04-23 14:59:01 +10:00
kheaders.c
…
kprobes.c
kprobes: Fix to check symbol prefixes correctly
2024-08-05 14:04:03 +09:00
ksyms_common.c
…
ksysfs.c
profiling: remove prof_cpu_mask
2024-07-29 10:45:54 -07:00
kthread.c
kthread: Fix task state in kthread worker if being frozen
2024-09-10 09:51:14 +02:00
latencytop.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
Makefile
mm: move kernel/numa.c to mm/
2024-09-03 21:15:26 -07:00
module_signature.c
…
notifier.c
…
nsproxy.c
introduce fd_file(), convert all accessors to it.
2024-08-12 22:00:43 -04:00
padata.c
Merge tag 'v6.12-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2024-09-16 06:28:28 +02:00
panic.c
Merge tag 'drm-next-2024-09-19' of https://gitlab.freedesktop.org/drm/kernel
2024-09-19 10:18:15 +02:00
params.c
params: Fix multi-line comment style
2023-12-01 09:51:44 -08:00
pid_namespace.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
pid_sysctl.h
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
pid.c
introduce fd_file(), convert all accessors to it.
2024-08-12 22:00:43 -04:00
profile.c
profiling: remove profile=sleep support
2024-08-04 13:36:28 -07:00
ptrace.c
ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped()
2024-02-22 15:38:52 -08:00
range.c
…
reboot.c
kernel misc: Remove the now superfluous sentinel elements from ctl_table array
2024-04-24 09:43:53 +02:00
regset.c
regset: use kvzalloc() for regset_get_alloc()
2024-04-25 21:07:03 -07:00
relay.c
kernel: relay: remove relay_file_splice_read dead code, doesn't work
2023-12-29 12:22:27 -08:00
resource_kunit.c
resource, kunit: add test case for region_intersects()
2024-09-17 01:07:00 -07:00
resource.c
Merge tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-09-21 07:29:05 -07:00
rseq.c
…
scftorture.c
scftorture: Make torture_type static
2024-05-30 15:31:51 -07:00
scs.c
…
seccomp.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
signal.c
Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-09-23 09:35:36 -07:00
smp.c
smp: print only local CPU info when sched_clock goes backward
2024-08-15 00:06:48 +05:30
smpboot.c
…
smpboot.h
…
softirq.c
softirq: Remove unused 'action' parameter from action callback
2024-08-20 17:13:40 +02:00
stackleak.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
stacktrace.c
stacktrace: fix kernel-doc typo
2023-12-29 12:22:29 -08:00
static_call_inline.c
…
static_call.c
…
stop_machine.c
rcu: Rename rcu_momentary_dyntick_idle() into rcu_momentary_eqs()
2024-08-15 21:30:42 +05:30
sys_ni.c
Merge tag 'probes-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2024-07-18 12:19:20 -07:00
sys.c
Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2024-09-23 09:35:36 -07:00
sysctl-test.c
sysctl: Add module description to sysctl-testing
2024-06-03 15:20:37 +02:00
sysctl.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
task_work.c
task_work: make TWA_NMI_CURRENT handling conditional on IRQ_WORK
2024-07-29 12:05:06 -07:00
taskstats.c
introduce fd_file(), convert all accessors to it.
2024-08-12 22:00:43 -04:00
torture.c
torture: Add MODULE_DESCRIPTION()
2024-05-30 15:31:38 -07:00
tracepoint.c
…
tsacct.c
tsacct: replace strncpy() with strscpy()
2024-07-12 16:39:53 -07:00
ucount.c
Merge tag 'sysctl-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl
2024-05-17 17:31:24 -07:00
uid16.c
…
uid16.h
…
umh.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
up.c
…
user_namespace.c
user_namespace: use kmemdup_array() instead of kmemdup() for multiple allocation
2024-09-09 16:47:42 -07:00
user-return-notifier.c
…
user.c
uidgid: make sure we fit into one cacheline
2024-09-12 12:16:09 +02:00
usermode_driver.c
…
utsname_sysctl.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
utsname.c
…
vhost_task.c
vhost_task: Handle SIGKILL by flushing work and exiting
2024-05-22 08:31:15 -04:00
vmcore_info.c
mm: support only one page_type per page
2024-09-03 21:15:43 -07:00
watch_queue.c
introduce fd_file(), convert all accessors to it.
2024-08-12 22:00:43 -04:00
watchdog_buddy.c
…
watchdog_perf.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-07-17 21:11:34 -07:00
watchdog.c
watchdog: handle the ENODEV failure case of lockup_detector_delay_init() separately
2024-09-01 20:43:32 -07:00
workqueue_internal.h
…
workqueue.c
Merge tag 'wq-for-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2024-09-18 06:59:44 +02:00