Messages in this thread | | | Date | Thu, 17 Dec 2020 14:08:52 -0500 | From | Steven Rostedt <> | Subject | [GIT PULL] tracing: Updates for 5.11 |
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Linus,
Tracing updates for 5.11
** Note there's a minor conflict with mainline, see second paragraph **
The major update to this release is that there's a new arch config option called: CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS. Currently, only x86_64 enables it. All the ftrace callbacks now take a struct ftrace_regs instead of a struct pt_regs. If the architecture has HAVE_DYNAMIC_FTRACE_WITH_ARGS enabled, then the ftrace_regs will have enough information to read the arguments of the function being traced, as well as access to the stack pointer. This way, if a user (like live kernel patching) only cares about the arguments, then it can avoid using the heavier weight "regs" callback, that puts in enough information in the struct ftrace_regs to simulate a breakpoint exception (needed for kprobes).
New config option that audits the timestamps of the ftrace ring buffer at most every event recorded. The "check_buffer()" calls will conflict with mainline, because I purposely added the check without including the fix that it caught, which is in mainline. Running a kernel built from the commit of the added check will trigger it.
Ftrace recursion protection has been cleaned up to move the protection to the callback itself (this saves on an extra function call for those callbacks).
Perf now handles its own RCU protection and does not depend on ftrace to do it for it (saving on that extra function call).
New debug option to add "recursed_functions" file to tracefs that lists all the places that triggered the recursion protection of the function tracer. This will show where things need to be fixed as recursion slows down the function tracer.
The eval enum mapping updates done at boot up are now offloaded to a work queue, as it caused a noticeable pause on slow embedded boards.
Various clean ups and last minute fixes.
Please pull the latest trace-v5.11 tree, which can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git trace-v5.11
Tag SHA1: 5db8571616e109a83cc9164e1c0e7875fe3f92b3 Head SHA1: f6a694665f132cbf6e2222dd2f173dc35330a8aa
Alex Shi (1): ftrace: Remove unused varible 'ret'
Arnd Bergmann (1): seq_buf: Avoid type mismatch for seq_buf_init
Kaixu Xia (1): tracing: Remove the useless value assignment in test_create_synth_event()
Lukas Bulwahn (4): MAINTAINERS: assign ./fs/tracefs to TRACING tracing: Clean up after filter logic rewriting ring-buffer: Remove obsolete rb_event_is_commit() tracing: Drop unneeded assignment in ring_buffer_resize()
Masami Hiramatsu (1): tracing: Disable ftrace selftests when any tracer is running
Qiujun Huang (4): tracing: Fix some typos in comments ring-buffer: Fix a typo in function description ring-buffer: Fix two typos in comments ring-buffer: Add rb_check_bpage in __rb_allocate_pages
Steven Rostedt (VMware) (21): ftrace: Move the recursion testing into global headers ftrace: Add ftrace_test_recursion_trylock() helper function ftrace: Optimize testing what context current is in pstore/ftrace: Add recursion protection to the ftrace callback kprobes/ftrace: Add recursion protection to the ftrace callback livepatch/ftrace: Add recursion protection to the ftrace callback livepatch: Trigger WARNING if livepatch function fails due to recursion perf/ftrace: Add recursion protection to the ftrace callback perf/ftrace: Check for rcu_is_watching() in callback function ftrace: Reverse what the RECURSION flag means in the ftrace_ops ftrace: Add recording of functions that caused recursion fgraph: Make overruns 4 bytes in graph stack structure ftrace: Clean up the recursion code a bit ring-buffer: Add recording of ring buffer recursion into recursed_functions ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default livepatch: Use the default ftrace_ops instead of REGS when ARGS is available ftrace/documentation: Fix RST C code blocks ring-buffer: Add test to validate the time stamp deltas Revert: "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS" tracing: Offload eval map updates to a work queue
---- Documentation/trace/ftrace-uses.rst | 90 +++++++++---- MAINTAINERS | 1 + arch/Kconfig | 16 +++ arch/csky/kernel/probes/ftrace.c | 16 ++- arch/nds32/kernel/ftrace.c | 4 +- arch/parisc/kernel/ftrace.c | 24 +++- arch/powerpc/include/asm/livepatch.h | 4 +- arch/powerpc/kernel/kprobes-ftrace.c | 15 ++- arch/s390/include/asm/livepatch.h | 5 +- arch/s390/kernel/ftrace.c | 20 ++- arch/x86/Kconfig | 1 + arch/x86/include/asm/ftrace.h | 18 +++ arch/x86/include/asm/livepatch.h | 4 +- arch/x86/kernel/ftrace_64.S | 15 ++- arch/x86/kernel/kprobes/ftrace.c | 15 ++- fs/pstore/ftrace.c | 8 +- include/linux/ftrace.h | 45 +++++-- include/linux/kprobes.h | 2 +- include/linux/seq_buf.h | 2 +- include/linux/trace_recursion.h | 232 +++++++++++++++++++++++++++++++++ include/linux/trace_seq.h | 4 +- kernel/livepatch/Kconfig | 2 +- kernel/livepatch/patch.c | 15 ++- kernel/trace/Kconfig | 68 ++++++++++ kernel/trace/Makefile | 1 + kernel/trace/blktrace.c | 4 +- kernel/trace/bpf_trace.c | 2 +- kernel/trace/fgraph.c | 3 +- kernel/trace/ftrace.c | 57 ++++---- kernel/trace/ring_buffer.c | 223 +++++++++++++++++++++++++++----- kernel/trace/synth_event_gen_test.c | 2 +- kernel/trace/trace.c | 53 ++++++-- kernel/trace/trace.h | 182 +------------------------- kernel/trace/trace_benchmark.c | 6 +- kernel/trace/trace_boot.c | 2 + kernel/trace/trace_dynevent.c | 2 +- kernel/trace/trace_dynevent.h | 6 +- kernel/trace/trace_entries.h | 6 +- kernel/trace/trace_event_perf.c | 15 ++- kernel/trace/trace_events.c | 9 +- kernel/trace/trace_events_filter.c | 23 +--- kernel/trace/trace_events_hist.c | 2 +- kernel/trace/trace_events_synth.c | 4 +- kernel/trace/trace_export.c | 2 +- kernel/trace/trace_functions.c | 23 ++-- kernel/trace/trace_functions_graph.c | 2 +- kernel/trace/trace_hwlat.c | 4 +- kernel/trace/trace_irqsoff.c | 2 +- kernel/trace/trace_kprobe.c | 9 +- kernel/trace/trace_output.c | 6 +- kernel/trace/trace_output.h | 1 + kernel/trace/trace_recursion_record.c | 236 ++++++++++++++++++++++++++++++++++ kernel/trace/trace_sched_wakeup.c | 2 +- kernel/trace/trace_selftest.c | 29 ++--- kernel/trace/trace_stack.c | 3 +- kernel/trace/tracing_map.c | 6 +- kernel/trace/tracing_map.h | 2 +- 57 files changed, 1140 insertions(+), 415 deletions(-) create mode 100644 include/linux/trace_recursion.h create mode 100644 kernel/trace/trace_recursion_record.c ---------------------------
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