AcoSail/kernel_optimize_test
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kernel_optimize_test/kernel/trace
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Yonghong Song 8482941f09 bpf: Add bpf_send_signal_thread() helper 
Commit 8b401f9ed2 ("bpf: implement bpf_send_signal() helper")
added helper bpf_send_signal() which permits bpf program to
send a signal to the current process. The signal may be
delivered to any threads in the process.

We found a use case where sending the signal to the current
thread is more preferable.
  - A bpf program will collect the stack trace and then
    send signal to the user application.
  - The user application will add some thread specific
    information to the just collected stack trace for
    later analysis.

If bpf_send_signal() is used, user application will need
to check whether the thread receiving the signal matches
the thread collecting the stack by checking thread id.
If not, it will need to send signal to another thread
through pthread_kill().

This patch proposed a new helper bpf_send_signal_thread(),
which sends the signal to the thread corresponding to
the current kernel task. This way, user space is guaranteed that
bpf_program execution context and user space signal handling
context are the same thread.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200115035002.602336-1-yhs@fb.com
2020-01-15 11:44:51 -08:00
..
blktrace.c cgroup: use cgrp->kn->id as the cgroup ID 2019-11-12 08:18:04 -08:00
bpf_trace.c bpf: Add bpf_send_signal_thread() helper 2020-01-15 11:44:51 -08:00
fgraph.c ftrace: Fix function_graph tracer interaction with BPF trampoline 2019-12-10 13:53:59 -05:00
ftrace_internal.h treewide: Rename rcu_dereference_raw_notrace() to _check() 2019-08-01 14:16:21 -07:00
ftrace.c This contains 3 changes: 2019-12-11 12:22:38 -08:00
Kconfig Two fixes and one patch that was missed: 2019-12-04 19:13:52 -08:00
Makefile tracing: Introduce trace event injection 2019-12-02 11:07:00 -05:00
power-traces.c
preemptirq_delay_test.c preemptirq_delay_test: Add the burst feature and a sysfs trigger 2019-11-13 09:37:28 -05:00
ring_buffer_benchmark.c ring-buffer: Fix typos in function ring_buffer_producer 2019-11-22 19:41:08 -05:00
ring_buffer.c Fix up for "printk: Drop pr_warning definition" 2019-12-06 10:02:35 +01:00
rpm-traces.c
trace_benchmark.c trace: Use pr_warn instead of pr_warning 2019-10-18 15:01:57 +02:00
trace_benchmark.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00
trace_branch.c tracing: Use generic type for comparator function 2019-11-14 13:15:11 -05:00
trace_clock.c tracing: Add SPDX License format tags to tracing files 2018-08-16 19:08:06 -04:00
trace_dynevent.c tracing: Add tracing_check_open_get_tr() 2019-10-12 20:44:07 -04:00
trace_dynevent.h tracing/dynevent: Pass extra arguments to match operation 2019-08-31 12:19:38 -04:00
trace_entries.h tracing: Change the function format to display function names by perf 2019-02-11 14:53:43 -05:00
trace_event_perf.c Merge branch 'perf/urgent' into perf/core, to pick up fixes 2019-10-28 12:38:26 +01:00
trace_events_filter_test.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00
trace_events_filter.c tracing: Avoid memory leak in process_system_preds() 2019-12-19 18:24:17 -05:00
trace_events_hist.c tracing: Fix endianness bug in histogram trigger 2019-12-21 16:08:59 -05:00
trace_events_inject.c tracing: remove set but not used variable 'buffer' 2019-12-10 13:53:51 -05:00
trace_events_trigger.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_events.c tracing: Fix lock inversion in trace_event_enable_tgid_record() 2019-12-21 16:05:13 -05:00
trace_export.c tracing: Make internal ftrace events static 2019-11-13 09:37:29 -05:00
trace_functions_graph.c fgraph: Remove redundant ftrace_graph_notrace_addr() test 2019-07-30 21:50:03 -04:00
trace_functions.c tracing: Update stack trace skipping for ORC unwinder 2018-01-23 15:57:00 -05:00
trace_hwlat.c tracing/hwlat: Fix a few trivial nits 2019-11-14 13:15:11 -05:00
trace_irqsoff.c The biggest change for this release is in the histogram code. 2019-03-11 17:01:32 -07:00
trace_kdb.c tracing: Silence GCC 9 array bounds warning 2019-05-25 23:04:30 -04:00
trace_kprobe_selftest.c selftest/ftrace: Move kprobe selftest function to separate compile unit 2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00
trace_kprobe.c tracing/kprobe: Check whether the non-suffixed symbol is notrace 2019-11-14 13:15:12 -05:00
trace_mmiotrace.c
trace_nop.c
trace_output.c tracing: Use seq_buf_hex_dump() to dump buffers 2019-11-14 13:15:12 -05:00
trace_output.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00
trace_preemptirq.c kprobes: Prohibit probing on hardirq tracers 2019-02-13 08:16:40 +01:00
trace_printk.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_probe_tmpl.h tracing/probe: Support user-space dereference 2019-05-25 23:04:42 -04:00
trace_probe.c tracing/probe: Fix to check the difference of nr_args before adding probe 2019-09-28 17:07:53 -04:00
trace_probe.h tracing/probe: Reject exactly same probe event 2019-09-19 11:09:16 -04:00
trace_sched_switch.c
trace_sched_wakeup.c sched/core: Convert get_task_struct() to return the task 2019-07-25 15:51:54 +02:00
trace_selftest_dynamic.c ftrace: Mark function tracer test functions noinline/noclone 2018-01-23 15:57:29 -05:00
trace_selftest.c function_graph: Have selftest also emulate tr->reset() as it did with tr->init() 2019-04-21 19:46:56 -04:00
trace_seq.c tracing: Use seq_buf_hex_dump() to dump buffers 2019-11-14 13:15:12 -05:00
trace_stack.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_stat.c tracing: Use generic type for comparator function 2019-11-14 13:15:11 -05:00
trace_stat.h tracing: Use generic type for comparator function 2019-11-14 13:15:11 -05:00
trace_syscalls.c tracing: Use xarray for syscall trace events 2019-11-22 19:47:41 -05:00
trace_uprobe.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace.c tracing: Fix lock inversion in trace_event_enable_tgid_record() 2019-12-21 16:05:13 -05:00
trace.h tracing: Introduce trace event injection 2019-12-02 11:07:00 -05:00
tracing_map.c tracing: Have the histogram compare functions convert to u64 first 2019-12-19 18:26:00 -05:00
tracing_map.h tracing: Fix SPDX format headers to use C++ style comments 2018-08-16 19:08:06 -04:00