John Keeping 2972e3050e tracing: Make trace_marker{,_raw} stream-like ... The tracing marker files are write-only streams with no meaningful concept of file position. Using stream_open() to mark them as stream-link indicates this and has the added advantage that a single file descriptor can now be used from multiple threads without contention thanks to clearing FMODE_ATOMIC_POS. Note that this has the potential to break existing userspace by since both lseek(2) and pwrite(2) will now return ESPIPE when previously lseek would have updated the stored offset and pwrite would have appended to the trace. A survey of libtracefs and several other projects found to use trace_marker(_raw) [1][2][3] suggests that everyone limits themselves to calling write(2) and close(2) on these file descriptors so there is a good chance this will go unnoticed and the benefits of reduced overhead and lock contention seem worth the risk. [1] https://github.com/google/perfetto [2] https://github.com/intel/media-driver/ [3] https://w1.fi/cgit/hostap/ Link: https://lkml.kernel.org/r/20211207142558.347029-1-john@metanate.com Signed-off-by: John Keeping <john@metanate.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2021-12-07 22:05:49 -05:00
..
blktrace.c	block: don't call blk_status_to_errno in blk_update_request	2021-10-19 05:54:57 -06:00
bpf_trace.c	bpf: Forbid bpf_ktime_get_coarse_ns and bpf_timer_* in tracing progs	2021-11-15 20:35:58 -08:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
error_report-traces.c	tracing: add error_report_end trace point	2021-02-26 09:41:02 -08:00
fgraph.c	x86/ftrace: Make function graph use ftrace directly	2021-10-20 23:44:43 -04:00
ftrace_internal.h
ftrace.c	Two tracing fixes:	2021-11-11 10:16:33 -08:00
Kconfig	tracing: Simplify the Kconfig dependency of FTRACE	2021-08-16 11:37:20 -04:00
kprobe_event_gen_test.c
Makefile	tracing: Place trace_pid_list logic into abstract functions	2021-10-05 17:30:08 -04:00
pid_list.c	tracing: Initialize upper and lower vars in pid_list_refill_irq()	2021-10-07 09:56:38 -04:00
pid_list.h	tracing: Create a sparse bitmask for pid filtering	2021-10-05 17:38:45 -04:00
power-traces.c
preemptirq_delay_test.c	kernel: trace: preemptirq_delay_test: add cpu affinity	2021-02-02 17:02:07 -05:00
ring_buffer_benchmark.c	sched,tracing: Convert to sched_set_fifo()	2020-07-29 11:43:53 +02:00
ring_buffer.c	ring-buffer: Protect ring_buffer_reset() from reentrancy	2021-11-10 11:56:29 -05:00
rpm-traces.c
synth_event_gen_test.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_benchmark.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_benchmark.h
trace_boot.c	tracing: Fix missing trace_boot_init_histograms kstrdup NULL checks	2021-10-26 09:18:10 -04:00
trace_branch.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_clock.c	tracing: Do no increment trace_clock_global() by one	2021-06-18 09:10:00 -04:00
trace_dynevent.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_dynevent.h	tracing: Add DYNAMIC flag for dynamic events	2021-08-18 18:10:32 -04:00
trace_entries.h	trace: Add timerlat tracer	2021-06-25 19:57:24 -04:00
trace_eprobe.c	tracing: Have eprobes use filtering logic of trace events	2021-12-06 15:37:22 -05:00
trace_event_perf.c	tracing: Show size of requested perf buffer	2021-10-27 12:25:09 -04:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Support __rel_loc relative dynamic data location attribute	2021-12-06 15:37:21 -05:00
trace_events_hist.c	tracing: Support __rel_loc relative dynamic data location attribute	2021-12-06 15:37:21 -05:00
trace_events_inject.c	tracing: Support __rel_loc relative dynamic data location attribute	2021-12-06 15:37:21 -05:00
trace_events_synth.c	tracing: Fix synth_event_add_val() kernel-doc comment	2021-12-06 17:53:50 -05:00
trace_events_trigger.c	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_events.c	tracing: Test the 'Do not trace this pid' case in create event	2021-11-27 16:50:43 -05:00
trace_export.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_functions_graph.c	tracing: in_irq() cleanup	2021-10-13 18:19:41 -04:00
trace_functions.c	ftrace: disable preemption when recursion locked	2021-10-27 11:21:49 -04:00
trace_hwlat.c	tracing/hwlat: Make some internal symbols static	2021-10-26 09:18:28 -04:00
trace_irqsoff.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_kdb.c	kdb: Rename members of struct kdbtab_t	2021-07-27 17:05:06 +01:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing/kprobes: Do not open code event reserve logic	2021-12-06 15:37:22 -05:00
trace_mmiotrace.c	tracing: Remove definition of DEBUG in trace_mmiotrace.c	2021-02-02 17:02:07 -05:00
trace_nop.c
trace_osnoise.c	tracing: Switch to kvfree_rcu() API	2021-12-06 17:53:50 -05:00
trace_output.c	tracing: Show kretprobe unknown indicator only for kretprobe_trampoline	2021-09-30 21:24:08 -04:00
trace_output.h	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-09-14 10:08:07 +02:00
trace_printk.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_probe_tmpl.h	tracing/probes: Have process_fetch_insn() take a void * instead of pt_regs	2021-08-19 09:09:03 -04:00
trace_probe.c	tracing: Switch to kvfree_rcu() API	2021-12-06 17:53:50 -05:00
trace_probe.h	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_recursion_record.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_sched_switch.c
trace_sched_wakeup.c	tracing: Change variable type as bool for clean-up	2021-06-30 09:19:14 -04:00
trace_selftest_dynamic.c
trace_selftest.c	tracing: Fix selftest config check for function graph start up test	2021-10-21 14:18:48 -04:00
trace_seq.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_stack.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_stat.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_stat.h
trace_synth.h	tracing: synth events: increase max fields count	2021-09-08 15:29:16 -04:00
trace_syscalls.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_uprobe.c	tracing/uprobes: Use trace_event_buffer_reserve() helper	2021-12-06 17:53:23 -05:00
trace.c	tracing: Make trace_marker{,_raw} stream-like	2021-12-07 22:05:49 -05:00
trace.h	tracing: Disable preemption when using the filter buffer	2021-12-06 15:37:22 -05:00
tracing_map.c	tracing: Fix a kmemleak false positive in tracing_map	2021-12-01 21:04:34 -05:00
tracing_map.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00