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761d9473e2
linux/kernel/trace
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Steven Rostedt (Google) 761d9473e2 ring-buffer: Do not set shortest_full when full target is hit 
The rb_watermark_hit() checks if the amount of data in the ring buffer is
above the percentage level passed in by the "full" variable. If it is, it
returns true.

But it also sets the "shortest_full" field of the cpu_buffer that informs
writers that it needs to call the irq_work if the amount of data on the
ring buffer is above the requested amount.

The rb_watermark_hit() always sets the shortest_full even if the amount in
the ring buffer is what it wants. As it is not going to wait, because it
has what it wants, there's no reason to set shortest_full.

Link: https://lore.kernel.org/linux-trace-kernel/20240312115641.6aa8ba08@gandalf.local.home

Cc: stable@vger.kernel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fixes: 42fb0a1e84 ("tracing/ring-buffer: Have polling block on watermark")
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2024-03-12 12:40:28 -04:00
..
rv tracing/tools: Updates for 6.4 2023-04-28 16:11:26 -07:00
blktrace.c block: remove more NULL checks after bdev_get_queue() 2023-02-21 09:23:22 -07:00
bpf_trace.c Revert BPF token-related functionality 2023-12-19 08:23:03 -08:00
bpf_trace.h
error_report-traces.c
fgraph.c tracing: arm64: Avoid missing-prototype warnings 2023-07-12 12:06:04 -04:00
fprobe.c Probes updates for v6.7: 2023-11-01 16:15:42 -10:00
ftrace_internal.h tracing: arm64: Avoid missing-prototype warnings 2023-07-12 12:06:04 -04:00
ftrace.c tracing: Fix HAVE_DYNAMIC_FTRACE_WITH_REGS ifdef 2024-02-13 11:56:49 -05:00
Kconfig Probes updates for v6.5: 2023-06-30 10:44:53 -07:00
kprobe_event_gen_test.c tracing: Fix wrong return in kprobe_event_gen_test.c 2023-03-19 12:20:48 -04:00
Makefile tracing/probes: Move finding func-proto API and getting func-param API to trace_btf 2023-08-23 09:39:45 +09:00
pid_list.c
pid_list.h
power-traces.c
preemptirq_delay_test.c
rethook.c rethook: Use __rcu pointer for rethook::handler 2023-12-01 14:53:56 +09:00
ring_buffer_benchmark.c ring-buffer: Read and write to ring buffers with custom sub buffer size 2023-12-20 07:54:56 -05:00
ring_buffer.c ring-buffer: Do not set shortest_full when full target is hit 2024-03-12 12:40:28 -04:00
rpm-traces.c
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2023-12-21 10:04:45 -05:00
trace_benchmark.c
trace_benchmark.h
trace_boot.c tracing: Allow creating instances with specified system events 2023-12-18 23:14:16 -05:00
trace_branch.c
trace_btf.c tracing/probes: Fix to search structure fields correctly 2024-02-17 21:25:42 +09:00
trace_btf.h tracing/probes: Add a function to search a member of a struct/union 2023-08-23 09:40:16 +09:00
trace_clock.c
trace_dynevent.c tracing: Free buffers when a used dynamic event is removed 2022-11-23 19:07:12 -05:00
trace_dynevent.h
trace_entries.h tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure 2023-07-30 18:11:44 -04:00
trace_eprobe.c tracing/eprobe: drop unneeded breaks 2023-10-10 01:03:48 +09:00
trace_event_perf.c tracing/perf: Use strndup_user instead of kzalloc/strncpy_from_user 2022-11-23 19:08:31 -05:00
trace_events_filter_test.h
trace_events_filter.c tracing: Have trace_event_file have ref counters 2023-11-01 23:44:44 -04:00
trace_events_hist.c tracing histograms: Simplify parse_actions() function 2024-01-08 13:24:56 -05:00
trace_events_inject.c tracing: Have event inject files inc the trace array ref count 2023-09-07 16:38:54 -04:00
trace_events_synth.c tracing/synthetic: Fix trace_string() return value 2024-02-15 11:40:01 -05:00
trace_events_trigger.c tracing/trigger: Fix to return error if failed to alloc snapshot 2024-01-26 15:10:24 -05:00
trace_events_user.c iov_iter: replace import_single_range() with import_ubuf() 2023-12-05 11:57:37 +01:00
trace_events.c ring-buffer: Page size per ring buffer 2023-12-20 07:54:55 -05:00
trace_export.c tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure 2023-07-30 18:11:44 -04:00
trace_fprobe.c tracing: fprobe-event: Fix to check tracepoint event and return 2023-11-10 20:06:12 +09:00
trace_functions_graph.c function_graph: Support recording and printing the return value of function 2023-06-20 18:38:37 -04:00
trace_functions.c
trace_hwlat.c tracing: Remove extra space at the end of hwlat_detector/mode 2023-09-01 21:00:00 -04:00
trace_irqsoff.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-17 13:49:37 -04:00
trace_kdb.c
trace_kprobe_selftest.c tracing: arm64: Avoid missing-prototype warnings 2023-07-12 12:06:04 -04:00
trace_kprobe_selftest.h
trace_kprobe.c trace/kprobe: Display the actual notrace function when rejecting a probe 2023-12-17 16:28:54 +09:00
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c tracing/timerlat: Move hrtimer_init to timerlat_fd open() 2024-02-01 11:50:13 -05:00
trace_output.c tracing: Remove precision vsnprintf() check from print event 2024-03-06 13:26:26 -05:00
trace_output.h tracing: Add "fields" option to show raw trace event fields 2023-03-29 06:52:08 -04:00
trace_preemptirq.c cpuidle: tracing, preempt: Squash _rcuidle tracing 2023-01-31 15:01:46 +01:00
trace_printk.c
trace_probe_kernel.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-07-14 17:04:58 +09:00
trace_probe_tmpl.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-07-14 17:04:58 +09:00
trace_probe.c tracing/probes: Fix to set arg size and fmt after setting type from BTF 2024-02-08 23:26:25 +09:00
trace_probe.h tracing/probes: Fix to show a parse error for bad type for $comm 2024-02-08 23:26:13 +09:00
trace_recursion_record.c
trace_sched_switch.c
trace_sched_wakeup.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-17 13:49:37 -04:00
trace_selftest_dynamic.c
trace_selftest.c tracing: Have function_graph selftest call cond_resched() 2023-05-28 21:15:46 -04:00
trace_seq.c trace_seq: Increase the buffer size to almost two pages 2023-12-18 23:14:16 -05:00
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h tracing: Allow synthetic events to pass around stacktraces 2023-01-25 10:31:24 -05:00
trace_syscalls.c bpf: Change syscall_nr type to int in struct syscall_tp_t 2023-10-13 12:39:36 -07:00
trace_uprobe.c tracing/uprobe: Replace strlcpy() with strscpy() 2023-12-01 10:25:35 -08:00
trace.c tracing: Use .flush() call to wake up readers 2024-03-10 12:27:47 -04:00
trace.h ring-buffer: Page size per ring buffer 2023-12-20 07:54:55 -05:00
tracing_map.c tracing: Ensure visibility when inserting an element into tracing_map 2024-01-22 17:15:40 -05:00
tracing_map.h tracing: Remove unused extern declaration tracing_map_set_field_descr() 2023-07-23 11:08:14 -04:00