Jiri Olsa e2bb9e01d5 bpf: Remove trace_printk_lock ... Both bpf_trace_printk and bpf_trace_vprintk helpers use static buffer guarded with trace_printk_lock spin lock. The spin lock contention causes issues with bpf programs attached to contention_begin tracepoint [1][2]. Andrii suggested we could get rid of the contention by using trylock, but we could actually get rid of the spinlock completely by using percpu buffers the same way as for bin_args in bpf_bprintf_prepare function. Adding new return 'buf' argument to struct bpf_bprintf_data and making bpf_bprintf_prepare to return also the buffer for printk helpers. [1] https://lore.kernel.org/bpf/CACkBjsakT_yWxnSWr4r-0TpPvbKm9-OBmVUhJb7hV3hY8fdCkw@mail.gmail.com/ [2] https://lore.kernel.org/bpf/CACkBjsaCsTovQHFfkqJKto6S4Z8d02ud1D7MPESrHa1cVNNTrw@mail.gmail.com/ Reported-by: Hao Sun <sunhao.th@gmail.com> Suggested-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20221215214430.1336195-4-jolsa@kernel.org		2022-12-19 22:08:37 +01:00
..
bpf	bpf: Remove trace_printk_lock	2022-12-19 22:08:37 +01:00
cgroup	Networking changes for 6.2.	2022-12-13 15:47:48 -08:00
configs	mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED	2022-12-01 00:09:20 +01:00
debug	kdb: use srcu console list iterator	2022-12-02 11:25:00 +01:00
dma	dma-mapping: reject __GFP_COMP in dma_alloc_attrs	2022-11-21 09:37:20 +01:00
entry	entry: kmsan: introduce kmsan_unpoison_entry_regs()	2022-10-03 14:03:25 -07:00
events	Perf events updates for v6.2:	2022-12-12 15:19:38 -08:00
futex	futex: Resend potentially swallowed owner death notification	2022-12-02 12:20:24 +01:00
gcov	gcov: clang: fix the buffer overflow issue	2022-11-22 18:50:41 -08:00
irq	genirq/msi: Provide msi_domain_alloc_irq_at()	2022-12-05 22:22:34 +01:00
kcsan	Non-MM patches for 6.2-rc1.	2022-12-12 17:28:58 -08:00
livepatch	modules changes for v6.2-rc1	2022-12-13 14:05:39 -08:00
locking	treewide: use get_random_u32_below() instead of deprecated function	2022-11-18 02:15:15 +01:00
module	Networking changes for 6.2.	2022-12-13 15:47:48 -08:00
power	PM: sleep: Refine error message in try_to_freeze_tasks()	2022-12-06 12:04:34 +01:00
printk	Merge branch 'rework/console-list-lock' into for-linus	2022-12-08 11:46:56 +01:00
rcu	Networking changes for 6.2.	2022-12-13 15:47:48 -08:00
sched	sysctl changes for v6.2-rc1	2022-12-13 14:16:44 -08:00
time	Random number generator updates for Linux 6.2-rc1.	2022-12-12 16:22:22 -08:00
trace	bpf: Remove trace_printk_lock	2022-12-19 22:08:37 +01:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2022-11-30 16:13:18 -08:00
async.c
audit.c	audit: use time_after to compare time	2022-08-29 19:47:03 -04:00
audit.h	audit: remove selinux_audit_rule_update() declaration	2022-09-07 11:30:15 -04:00
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-08-22 18:50:06 -04:00
audit_tree.c
audit_watch.c	audit_init_parent(): constify path	2022-09-01 17:39:30 -04:00
auditfilter.c
auditsc.c	audit: unify audit_filter_{uring(), inode_name(), syscall()}	2022-10-17 14:24:42 -04:00
backtracetest.c
bounds.c	mm: multi-gen LRU: minimal implementation	2022-09-26 19:46:09 -07:00
capability.c	caps: use type safe idmapping helpers	2022-10-26 10:02:39 +02:00
cfi.c	cfi: Switch to -fsanitize=kcfi	2022-09-26 10:13:13 -07:00
compat.c
configs.c
context_tracking.c
cpu.c	cpu/hotplug: Do not bail-out in DYING/STARTING sections	2022-12-02 12:43:02 +01:00
cpu_pm.c
crash_core.c	vmcoreinfo: warn if we exceed vmcoreinfo data size	2022-11-30 16:13:17 -08:00
crash_dump.c
cred.c
delayacct.c	delayacct: support re-entrance detection of thrashing accounting	2022-09-26 19:46:07 -07:00
dma.c
exec_domain.c
exit.c	- hfs and hfsplus kmap API modernization from Fabio Francesco	2022-10-12 11:00:22 -07:00
extable.c
fail_function.c	fail_function: fix wrong use of fei_attr_remove()	2022-09-11 21:55:11 -07:00
fork.c	Random number generator updates for Linux 6.2-rc1.	2022-12-12 16:22:22 -08:00
freezer.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
gen_kheaders.sh	kbuild: build init/built-in.a just once	2022-09-29 04:40:15 +09:00
groups.c
hung_task.c	sched: Fix more TASK_state comparisons	2022-09-30 16:50:39 +02:00
iomem.c
irq_work.c
jump_label.c	jump_label: Prevent key->enabled int overflow	2022-12-01 15:53:05 -08:00
kallsyms.c	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kallsyms_internal.h	kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]	2022-11-12 18:47:36 -08:00
kallsyms_selftest.c	kallsyms: Remove unneeded semicolon	2022-11-18 12:56:40 -08:00
kallsyms_selftest.h	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: kmsan: unpoison area->list in kcov_remote_area_put()	2022-10-03 14:03:23 -07:00
kexec.c	panic, kexec: make __crash_kexec() NMI safe	2022-09-11 21:55:06 -07:00
kexec_core.c	kexec: remove the unneeded result variable	2022-11-18 13:55:07 -08:00
kexec_elf.c
kexec_file.c	kexec: replace crash_mem_range with range	2022-11-18 13:55:07 -08:00
kexec_internal.h	panic, kexec: make __crash_kexec() NMI safe	2022-09-11 21:55:06 -07:00
kheaders.c
kmod.c
kprobes.c	kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case	2022-11-18 10:15:34 +09:00
ksysfs.c	kexec: turn all kexec_mutex acquisitions into trylocks	2022-09-11 21:55:06 -07:00
kthread.c	signal: break out of wait loops on kthread_stop()	2022-10-09 16:01:59 -07:00
latencytop.c	latencytop: use the last element of latency_record of system	2022-09-11 21:55:12 -07:00
Makefile	kallsyms: Add self-test facility	2022-11-15 00:42:02 -08:00
module_signature.c
notifier.c	notifier: repair slips in kernel-doc comments	2022-11-30 19:32:30 +01:00
nsproxy.c	fs/exec: switch timens when a task gets a new mm	2022-10-25 15:15:52 -07:00
padata.c
panic.c	panic: use str_enabled_disabled() helper	2022-11-18 13:55:06 -08:00
params.c	kernel/params.c: defer most of param_sysfs_init() to late_initcall time	2022-11-11 10:19:52 -08:00
pid.c
pid_namespace.c
profile.c	kernel/profile.c: simplify duplicated code in profile_setup()	2022-09-11 21:55:12 -07:00
ptrace.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
range.c
reboot.c	kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode	2022-10-04 15:59:36 +02:00
regset.c
relay.c	relay: fix type mismatch when allocating memory in relay_create_buf()	2022-12-11 19:30:19 -08:00
resource.c	PCI: Allow drivers to request exclusive config regions	2022-11-14 10:07:22 -08:00
resource_kunit.c
rseq.c	rseq: Use pr_warn_once() when deprecated/unknown ABI flags are encountered	2022-11-14 09:58:32 +01:00
scftorture.c
scs.c	scs: add support for dynamic shadow call stacks	2022-11-09 18:06:35 +00:00
seccomp.c
signal.c	kill signal_pt_regs()	2022-10-23 18:06:54 -04:00
smp.c	bitmap patches for v6.1-rc1	2022-10-10 12:49:34 -07:00
smpboot.c	smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death	2022-09-11 21:55:10 -07:00
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c
static_call_inline.c
stop_machine.c
sys.c	Random number generator updates for Linux 6.1-rc1.	2022-10-10 10:41:21 -07:00
sys_ni.c	kernel/sys_ni: add compat entry for fadvise64_64	2022-08-20 15:17:45 -07:00
sysctl-test.c	kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}	2022-09-08 16:56:45 -07:00
sysctl.c	sysctl changes for v6.2-rc1	2022-12-13 14:16:44 -08:00
task_work.c	task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run	2022-09-11 21:55:10 -07:00
taskstats.c	genetlink: start to validate reserved header bytes	2022-08-29 12:47:15 +01:00
torture.c
tracepoint.c	tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming()	2022-09-26 13:01:18 -04:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
up.c
user-return-notifier.c
user.c
user_namespace.c	ucounts: Split rlimit and ucount values and max values	2022-10-09 16:24:05 -07:00
usermode_driver.c
utsname.c
utsname_sysctl.c	kernel/utsname_sysctl.c: Fix hostname polling	2022-10-23 12:01:01 -07:00
watch_queue.c
watchdog.c
watchdog_hld.c
workqueue.c	workqueue: Make queue_rcu_work() use call_rcu_hurry()	2022-11-30 13:17:05 -08:00
workqueue_internal.h