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Paul E. McKenney c34fa06f4b FROMLIST: rcu: Don't deboost before reporting expedited quiescent state 
Currently rcu_preempt_deferred_qs_irqrestore() releases rnp->boost_mtx
before reporting the expedited quiescent state.  Under heavy real-time
load, this can result in this function being preempted before the
quiescent state is reported, which can in turn prevent the expedited grace
period from completing.  Tim Murray reports that the resulting expedited
grace periods can take hundreds of milliseconds and even more than one
second, when they should normally complete in less than a millisecond.

This patch follows Neeraj's suggestion (seconded by Tim and by Uladzislau
Rezki) of simply reversing the two operations.

Reported-by: Tim Murray <timmurray@google.com>
Reported-by: Joel Fernandes <joelaf@google.com>
Reported-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

Bug: 217236054
Link: https://lore.kernel.org/lkml/20220204232406.814-9-paulmck@kernel.org/
Signed-off-by: Tim Murray <timmurray@google.com>
Change-Id: Ic0f0330b65a0c776a563e03e4b59bf4ab4fbccf6
 		2022-02-05 02:03:10 +00:00
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bpf UPSTREAM: bpf: Fix integer overflow in argument calculation for bpf_map_area_alloc 2022-01-26 09:16:43 +00:00
cgroup Revert half of "ANDROID: cpu/hotplug: create vendor hook for cpu_up/cpu_down" 2022-01-21 13:13:16 +01:00
configs
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debug kgdb: fix to kill breakpoints on initmem after boot 2021-03-04 11:38:46 +01:00
dma Merge tag 'android12-5.10.81_r00' into android12-5.10 2022-01-21 09:35:04 +01:00
entry KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest 2021-10-06 15:55:49 +02:00
events This is the 5.10.81 stable release 2021-11-21 14:29:02 +01:00
gcov gcov: re-fix clang-11+ support 2021-04-14 08:41:58 +02:00
irq This is the 5.10.65 stable release 2021-09-15 14:16:47 +02:00
kcsan kcsan: Fix debugfs initcall return type 2021-05-26 12:06:54 +02:00
livepatch
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locking Merge tag 'android12-5.10.81_r00' into android12-5.10 2022-01-21 09:35:04 +01:00
power This is the 5.10.80 stable release 2021-11-19 11:50:41 +01:00
printk FROMGIT: printk: ringbuffer: Improve prb_next_seq() performance 2022-01-27 00:37:36 +05:30
rcu FROMLIST: rcu: Don't deboost before reporting expedited quiescent state 2022-02-05 02:03:10 +00:00
sched Merge tag 'android12-5.10.81_r00' into android12-5.10 2022-01-21 09:35:04 +01:00
time Merge tag 'android12-5.10.81_r00' into android12-5.10 2022-01-21 09:35:04 +01:00
trace This is the 5.10.80 stable release 2021-11-19 11:50:41 +01:00
.gitignore kbuild: update config_data.gz only when the content of .config is changed 2021-05-11 14:47:37 +02:00
Kconfig.freezer
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Kconfig.hz
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Kconfig.locks
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Kconfig.preempt
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Makefile kbuild: update config_data.gz only when the content of .config is changed 2021-05-11 14:47:37 +02:00
acct.c
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async.c
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audit.c
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audit.h
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audit_fsnotify.c fsnotify: generalize handle_inode_event() 2020-12-30 11:54:18 +01:00
audit_tree.c audit: move put_tree() to avoid trim_trees refcount underflow and UAF 2021-09-03 10:09:31 +02:00
audit_watch.c fsnotify: generalize handle_inode_event() 2020-12-30 11:54:18 +01:00
auditfilter.c
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auditsc.c audit: fix possible null-pointer dereference in audit_filter_rules 2021-10-27 09:56:52 +02:00
backtracetest.c
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bounds.c
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capability.c
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cfi.c ANDROID: cfi: explicitly clear diag in __cfi_slowpath 2021-09-02 08:55:56 +00:00
compat.c
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configs.c
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context_tracking.c
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cpu.c Revert half of "ANDROID: cpu/hotplug: create vendor hook for cpu_up/cpu_down" 2022-01-21 13:13:16 +01:00
cpu_pm.c PM: cpu: Make notifier chain use a raw_spinlock_t 2021-09-15 09:50:40 +02:00
crash_core.c crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo 2021-06-23 14:42:52 +02:00
crash_dump.c
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cred.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
delayacct.c
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dma.c
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exec_domain.c
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exit.c ANDROID: vendor_hooks: Add hooks for memory when debug 2021-03-19 04:54:07 +00:00
extable.c
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fail_function.c fail_function: Remove a redundant mutex unlock 2020-11-19 11:58:16 -08:00
fork.c Merge tag 'android12-5.10.81_r00' into android12-5.10 2022-01-21 09:35:04 +01:00
freezer.c ANDROID: freezer: Add vendor hook to freezer for GKI purpose. 2021-06-07 16:07:44 +00:00
futex.c ANDROID: vendor_hooks: Add hooks for futex 2021-12-20 04:23:00 +00:00
gen_kheaders.sh
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groups.c
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hung_task.c FROMLIST: freezer: Add frozen_or_skipped() helper function 2021-06-02 15:42:01 +00:00
iomem.c
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irq_work.c ANDROID: Sched: Export scheduler symbols needed by vendor modules 2020-12-03 16:50:04 +00:00
jump_label.c jump_label: Fix jump_label_text_reserved() vs __init 2021-07-20 16:05:58 +02:00
kallsyms.c ANDROID: kallsyms: cfi: strip hashes from static functions 2021-01-14 16:31:46 +00:00
kcmp.c exec: Transform exec_update_mutex into a rw_semaphore 2021-01-09 13:46:24 +01:00
kcov.c
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kexec.c
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kexec_core.c kernel: kexec: remove the lock operation of system_transition_mutex 2021-02-03 23:28:37 +01:00
kexec_elf.c
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kexec_file.c kernel: kexec_file: fix error return code of kexec_calculate_store_digests() 2021-05-19 10:13:09 +02:00
kexec_internal.h
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kheaders.c
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kmod.c
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kprobes.c kprobes: Do not use local variable when creating debugfs file 2021-11-18 14:04:05 +01:00
ksysfs.c
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kthread.c This is the 5.10.62 stable release 2021-09-03 10:51:56 +02:00
latencytop.c
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module-internal.h
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module.c Merge branch 'android12-5.10' into `android12-5.10-lts` 2021-07-22 13:32:27 +02:00
module_signature.c module: harden ELF info handling 2021-03-25 09:04:11 +01:00
module_signing.c module: harden ELF info handling 2021-03-25 09:04:11 +01:00
notifier.c
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nsproxy.c
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padata.c
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panic.c panic: don't dump stack twice on warn 2020-11-14 11:26:04 -08:00
params.c params: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
pid.c Merge 5.10.6 into android12-5.10 2021-01-13 10:28:55 +01:00
pid_namespace.c memcg: enable accounting for pids in nested pid namespaces 2021-09-18 13:40:36 +02:00
profile.c profiling: fix shift-out-of-bounds bugs 2021-09-26 14:08:58 +02:00
ptrace.c ptrace: make ptrace() fail if the tracee changed its pid unexpectedly 2021-05-26 12:06:49 +02:00
range.c
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reboot.c Merge e28c0d7c92 ("Merge branch 'akpm' (patches from Andrew)") into android-mainline 2020-11-15 14:37:09 +01:00
regset.c
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relay.c
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resource.c kernel/resource: make walk_mem_res() find all busy IORESOURCE_MEM resources 2021-05-19 10:13:09 +02:00
rseq.c KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest 2021-10-06 15:55:49 +02:00
scftorture.c
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scs.c FROMGIT: scs: Release kasan vmalloc poison in scs_free process 2021-10-04 15:44:53 +00:00
seccomp.c This is the 5.10.60 stable release 2021-08-27 17:14:51 +02:00
signal.c This is the 5.10.80 stable release 2021-11-19 11:50:41 +01:00
smp.c ANDROID: Fix kernelci warnings for indentation in smp.c 2021-07-06 21:17:01 +00:00
smpboot.c sched/core: Initialize the idle task with preemption disabled 2021-07-14 16:55:50 +02:00
smpboot.h
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softirq.c ANDROID: softirq: Export irq_handler_exit tracepoint 2020-12-21 17:48:06 +00:00
stackleak.c
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stacktrace.c ANDROID: stacktrace: export stack_trace_save_tsk/regs 2021-04-13 13:18:04 +00:00
static_call.c static_call: Fix unused variable warn w/o MODULE 2021-09-08 08:49:00 +02:00
stop_machine.c ANDROID: stop_machine: stop_one_cpu_async 2020-12-08 19:07:21 +00:00
sys.c This is the 5.10.69 stable release 2021-09-30 18:36:17 +02:00
sys_ni.c UPSTREAM: mm: wire up syscall process_mrelease 2022-01-06 17:37:36 +00:00
sysctl-test.c
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sysctl.c FROMLIST: mm: compaction: support triggering of proactive compaction by user 2021-06-17 14:15:58 -07:00
task_work.c FROMGIT: kasan: record task_work_add() call stack 2021-03-24 15:09:18 -07:00
taskstats.c
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test_kprobes.c
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torture.c
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tracepoint.c This is the 5.10.62 stable release 2021-09-03 10:51:56 +02:00
tsacct.c
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ucount.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
uid16.c
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uid16.h
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umh.c
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up.c smp: Fix smp_call_function_single_async prototype 2021-05-14 09:50:46 +02:00
user-return-notifier.c
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user.c Revert "ANDROID: user: Add vendor hook to user for GKI purpose" 2022-01-20 10:04:49 +01:00
user_namespace.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
usermode_driver.c bpf: Fix umd memory leak in copy_process() 2021-03-30 14:32:03 +02:00
utsname.c
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utsname_sysctl.c
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watch_queue.c
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watchdog.c Merge 5.10.38 into android12-5.10 2021-05-20 15:35:25 +02:00
watchdog_hld.c
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workqueue.c Merge tag 'android12-5.10.81_r00' into android12-5.10 2022-01-21 09:35:04 +01:00
workqueue_internal.h
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