Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-18 03:06:43 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
linux-stable/kernel
History
Jesper Dangaard Brouer d0618410ec tracing, perf: Adjust code layout in get_recursion_context() 
In an XDP redirect applications using tracepoint xdp:xdp_redirect to
diagnose TX overrun, I noticed perf_swevent_get_recursion_context()
was consuming 2% CPU. This was reduced to 1.85% with this simple
change.

Looking at the annotated asm code, it was clear that the unlikely case
in_nmi() test was chosen (by the compiler) as the most likely
event/branch.  This small adjustment makes the compiler (GCC version
7.1.1 20170622 (Red Hat 7.1.1-3)) put in_nmi() as an unlikely branch.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/150342256382.16595.986861478681783732.stgit@firesoul
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-25 11:04:18 +02:00
..
bpf
bpf: fix bpf_prog_get_info_by_fd to dump correct xlated_prog_len
2017-07-29 23:29:41 -07:00
cgroup
cpuset: fix a deadlock due to incomplete patching of cpusets_enabled()
2017-08-02 17:16:12 -07:00
configs
config: android-base: disable CONFIG_NFSD and CONFIG_NFS_FS
2017-06-09 11:47:38 +02:00
debug
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
events
tracing, perf: Adjust code layout in get_recursion_context()
2017-08-25 11:04:18 +02:00
gcov
gcov: support GCC 7.1
2017-05-12 15:57:15 -07:00
irq
genirq/ipi: Fixup checks against nr_cpu_ids
2017-08-20 10:49:05 +02:00
livepatch
livepatch: Fix stacking of patches with respect to RCU
2017-06-20 10:42:19 +02:00
locking
Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-07-21 11:11:23 -07:00
power
mm: fix global NR_SLAB_.*CLAIMABLE counter reads
2017-08-10 15:54:06 -07:00
printk
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
2017-07-05 11:11:26 -07:00
rcu
rcu: Remove RCU CPU stall warnings from Tiny RCU
2017-06-08 18:52:45 -07:00
sched
sched/core: Fix some documentation build warnings
2017-07-25 11:17:02 +02:00
time
timers: Fix overflow in get_next_timer_interrupt
2017-08-01 14:20:53 +02:00
trace
Various bug fixes:
2017-08-24 14:08:22 -07:00
.gitignore
certs: add .gitignore to stop git nagging about x509_certificate_list
2015-10-21 15:18:35 +01:00
acct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
async.c
async: Adjust system_state checks
2017-05-23 10:01:37 +02:00
audit_fsnotify.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit_tree.c
Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2017-05-03 11:05:15 -07:00
audit_watch.c
audit/stable-4.13 PR 20170816
2017-08-16 16:48:34 -07:00
audit.c
Merge branch 'stable-4.13' of git://git.infradead.org/users/pcmoore/audit
2017-07-20 10:22:26 -07:00
audit.h
audit: style fix
2017-06-12 18:07:43 -04:00
auditfilter.c
audit: kernel generated netlink traffic should have a portid of 0
2017-05-02 10:16:05 -04:00
auditsc.c
Merge branch 'stable-4.13' of git://git.infradead.org/users/pcmoore/audit
2017-07-05 11:24:05 -07:00
backtracetest.c
…
bounds.c
…
capability.c
capability: export has_capability
2017-01-12 07:01:56 -07:00
compat.c
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-06 20:57:13 -07:00
configs.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
context_tracking.c
context_tracking: Switch to new static_branch API
2015-11-24 09:56:43 +01:00
cpu_pm.c
kernel/cpu_pm: fix cpu_cluster_pm_exit comment
2015-09-03 02:42:20 +02:00
cpu.c
smp/hotplug: Replace BUG_ON and react useful
2017-07-11 22:25:44 +02:00
crash_core.c
kdump: protect vmcoreinfo data under the crash memory
2017-07-12 16:26:00 -07:00
crash_dump.c
…
cred.c
doc: ReSTify credentials.txt
2017-05-18 10:30:19 -06:00
delayacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
kernel/exit.c: avoid undefined behaviour when calling wait4()
2017-07-10 16:32:36 -07:00
extable.c
lib/extable.c: use bsearch() library function in search_extable()
2017-07-10 16:32:35 -07:00
fork.c
mm: migrate: prevent racy access to tlb_flush_pending
2017-08-10 15:54:07 -07:00
freezer.c
freezer, oom: check TIF_MEMDIE on the correct task
2016-07-28 16:07:41 -07:00
futex_compat.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
futex.c
futex: Remove unnecessary warning from get_futex_key
2017-08-09 14:00:54 -07:00
groups.c
kernel/groups.c: use sort library function
2017-07-10 16:32:34 -07:00
hung_task.c
kernel/hung_task.c: defer showing held locks
2017-05-08 17:15:10 -07:00
irq_work.c
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
jump_label.c
jump_label: Reorder hotplug lock and jump_label_lock
2017-05-26 10:10:45 +02:00
kallsyms.c
kernel/kallsyms.c: replace all_var with IS_ENABLED(CONFIG_KALLSYMS_ALL)
2017-07-10 16:32:34 -07:00
kcmp.c
kcmp: add KCMP_EPOLL_TFD mode to compare epoll target files
2017-07-12 16:26:01 -07:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES
2016-10-25 11:31:51 +02:00
Kconfig.preempt
…
kcov.c
kcov: simplify interrupt check
2017-05-08 17:15:12 -07:00
kexec_core.c
kdump: protect vmcoreinfo data under the crash memory
2017-07-12 16:26:00 -07:00
kexec_file.c
kexec_file: adjust declaration of kexec_purgatory
2017-07-12 16:26:02 -07:00
kexec_internal.h
kexec_file: adjust declaration of kexec_purgatory
2017-07-12 16:26:02 -07:00
kexec.c
kdump: protect vmcoreinfo data under the crash memory
2017-07-12 16:26:00 -07:00
kmod.c
kmod: fix wait on recursive loop
2017-08-18 15:32:01 -07:00
kprobes.c
kprobes: Ensure that jprobe probepoints are at function entry
2017-07-08 11:05:35 +02:00
ksysfs.c
kexec: move vmcoreinfo out of the kernel's .bss section
2017-07-12 16:25:59 -07:00
kthread.c
cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups
2017-03-17 10:18:47 -04:00
latencytop.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
Makefile
kernel/watchdog: split up config options
2017-07-12 16:26:02 -07:00
membarrier.c
Fix: Disable sys_membarrier when nohz_full is enabled
2017-01-23 11:32:16 -08:00
memremap.c
mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory
2017-07-06 16:24:32 -07:00
module_signing.c
KEYS: Move the point of trust determination to __key_link()
2016-04-11 22:43:43 +01:00
module-internal.h
…
module.c
Modules updates for v4.13
2017-07-12 17:22:01 -07:00
notifier.c
kernel/notifier.c: simplify expression
2017-02-24 17:46:56 -08:00
nsproxy.c
perf: Add PERF_RECORD_NAMESPACES to include namespaces related info
2017-03-13 15:57:41 -03:00
padata.c
padata: Avoid nested calls to cpus_read_lock() in pcrypt_init_padata()
2017-05-26 10:10:37 +02:00
panic.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>
2017-03-02 08:42:34 +01:00
params.c
boot/param: Move next_arg() function to lib/cmdline.c for later reuse
2017-04-18 10:37:13 +02:00
pid_namespace.c
pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes
2017-05-13 17:26:01 -05:00
pid.c
pids: make task_tgid_nr_ns() safe
2017-08-21 12:47:31 -07:00
profile.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
ptrace.c
ptrace: Properly initialize ptracer_cred on fork
2017-05-23 07:40:44 -05:00
range.c
…
reboot.c
kexec: split kexec_load syscall from kexec core code
2015-09-10 13:29:01 -07:00
relay.c
Merge branch 'work.splice' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-05-02 11:38:06 -07:00
resource.c
/proc/iomem: only expose physical resource addresses to privileged users
2016-04-14 12:56:09 -07:00
seccomp.c
seccomp: Switch from atomic_t to recount_t
2017-06-26 09:24:00 -07:00
signal.c
signal: don't remove SIGNAL_UNKILLABLE for traced tasks.
2017-08-18 15:32:02 -07:00
smp.c
smp, cpumask: Use non-atomic cpumask_{set,clear}_cpu()
2017-05-23 10:01:32 +02:00
smpboot.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
smpboot.h
cpu/hotplug: Create hotplug threads
2016-03-01 20:36:56 +01:00
softirq.c
sched/core: Remove 'task' parameter and rename tsk_restore_flags() to current_restore_flags()
2017-04-11 09:06:32 +02:00
stacktrace.c
stacktrace/x86: add function for detecting reliable stack traces
2017-03-08 09:18:02 +01:00
stop_machine.c
stop_machine: Provide stop_machine_cpuslocked()
2017-05-26 10:10:36 +02:00
sys_ni.c
move aio compat to fs/aio.c
2016-12-22 22:58:37 -05:00
sys.c
fix a braino in compat_sys_getrlimit()
2017-07-12 09:15:00 -07:00
sysctl_binary.c
kernel/sysctl_binary.c: check name array length in deprecated_sysctl_warning()
2017-07-12 16:26:00 -07:00
sysctl.c
kernel/watchdog: split up config options
2017-07-12 16:26:02 -07:00
task_work.c
task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works
2016-08-02 19:35:02 -04:00
taskstats.c
taskstats: add e/u/stime for TGID command
2017-05-08 17:15:12 -07:00
test_kprobes.c
…
torture.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>
2017-03-02 08:42:27 +01:00
tracepoint.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
tsacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
ucount.c
ucount: Remove the atomicity from ucount->count
2017-03-06 15:26:37 -06:00
uid16.c
sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>
2017-03-02 08:42:31 +01:00
up.c
smp: Add function to execute a function synchronously on a CPU
2016-09-05 13:52:39 +02:00
user_namespace.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>
2017-03-02 08:42:29 +01:00
user-return-notifier.c
…
user.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/user.h>
2017-03-02 08:42:29 +01:00
utsname_sysctl.c
sched/headers: Remove <linux/rwsem.h> from <linux/sched.h>
2017-03-03 01:45:36 +01:00
utsname.c
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
watchdog_hld.c
kernel/watchdog: Prevent false positives with turbo modes
2017-08-18 12:35:02 +02:00
watchdog.c
kernel/watchdog: Prevent false positives with turbo modes
2017-08-18 12:35:02 +02:00
workqueue_internal.h
sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()
2016-03-02 10:28:47 -05:00
workqueue.c
workqueue: Work around edge cases for calc of pool's cpumask
2017-07-28 11:05:52 -04:00