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authorLinus Torvalds <torvalds@linux-foundation.org>2022-12-15 18:01:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-12-15 18:01:16 -0800
commitfe36bb8736ee9e38fa6173e1271ed8c5cf7bc907 (patch)
tree15948d02fe68c2b8c8d6de803006a82f226853de /samples
parent851f657a86421dded42b6175c6ea0f4f5e86af97 (diff)
parenteb9d58947d40699d93e5e69e1ddc54e41da7e132 (diff)
Merge tag 'trace-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing updates from Steven Rostedt: - Add options to the osnoise tracer: - 'panic_on_stop' option that panics the kernel if osnoise is greater than some user defined threshold. - 'preempt' option, to test noise while preemption is disabled - 'irq' option, to test noise when interrupts are disabled - Add .percent and .graph suffix to histograms to give different outputs - Add nohitcount to disable showing hitcount in histogram output - Add new __cpumask() to trace event fields to annotate that a unsigned long array is a cpumask to user space and should be treated as one. - Add trace_trigger kernel command line parameter to enable trace event triggers at boot up. Useful to trace stack traces, disable tracing and take snapshots. - Fix x86/kmmio mmio tracer to work with the updates to lockdep - Unify the panic and die notifiers - Add back ftrace_expect reference that is used to extract more information in the ftrace_bug() code. - Have trigger filter parsing errors show up in the tracing error log. - Updated MAINTAINERS file to add kernel tracing mailing list and patchwork info - Use IDA to keep track of event type numbers. - And minor fixes and clean ups * tag 'trace-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (44 commits) tracing: Fix cpumask() example typo tracing: Improve panic/die notifiers ftrace: Prevent RCU stall on PREEMPT_VOLUNTARY kernels tracing: Do not synchronize freeing of trigger filter on boot up tracing: Remove pointer (asterisk) and brackets from cpumask_t field tracing: Have trigger filter parsing errors show up in error_log x86/mm/kmmio: Remove redundant preempt_disable() tracing: Fix infinite loop in tracing_read_pipe on overflowed print_trace_line Documentation/osnoise: Add osnoise/options documentation tracing/osnoise: Add preempt and/or irq disabled options tracing/osnoise: Add PANIC_ON_STOP option Documentation/osnoise: Escape underscore of NO_ prefix tracing: Fix some checker warnings tracing/osnoise: Make osnoise_options static tracing: remove unnecessary trace_trigger ifdef ring-buffer: Handle resize in early boot up tracing/hist: Fix issue of losting command info in error_log tracing: Fix issue of missing one synthetic field tracing/hist: Fix out-of-bound write on 'action_data.var_ref_idx' tracing/hist: Fix wrong return value in parse_action_params() ...
Diffstat (limited to 'samples')
-rw-r--r--samples/trace_events/trace-events-sample.c2
-rw-r--r--samples/trace_events/trace-events-sample.h34
2 files changed, 27 insertions, 9 deletions
diff --git a/samples/trace_events/trace-events-sample.c b/samples/trace_events/trace-events-sample.c
index 608c4ae3b08a..ecc7db237f2e 100644
--- a/samples/trace_events/trace-events-sample.c
+++ b/samples/trace_events/trace-events-sample.c
@@ -50,7 +50,7 @@ static void do_simple_thread_func(int cnt, const char *fmt, ...)
trace_foo_with_template_print("I have to be different", cnt);
- trace_foo_rel_loc("Hello __rel_loc", cnt, bitmask);
+ trace_foo_rel_loc("Hello __rel_loc", cnt, bitmask, current->cpus_ptr);
}
static void simple_thread_func(int cnt)
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index 1a92226202fc..1c6b843b8c4e 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -200,6 +200,16 @@
*
* __assign_bitmask(target_cpus, cpumask_bits(bar), nr_cpumask_bits);
*
+ * __cpumask: This is pretty much the same as __bitmask but is specific for
+ * CPU masks. The type displayed to the user via the format files will
+ * be "cpumaks_t" such that user space may deal with them differently
+ * if they choose to do so, and the bits is always set to nr_cpumask_bits.
+ *
+ * __cpumask(target_cpu)
+ *
+ * To assign a cpumask, use the __assign_cpumask() helper macro.
+ *
+ * __assign_cpumask(target_cpus, cpumask_bits(bar));
*
* fast_assign: This is a C like function that is used to store the items
* into the ring buffer. A special variable called "__entry" will be the
@@ -212,8 +222,8 @@
* This is also used to print out the data from the trace files.
* Again, the __entry macro is used to access the data from the ring buffer.
*
- * Note, __dynamic_array, __string, and __bitmask require special helpers
- * to access the data.
+ * Note, __dynamic_array, __string, __bitmask and __cpumask require special
+ * helpers to access the data.
*
* For __dynamic_array(int, foo, bar) use __get_dynamic_array(foo)
* Use __get_dynamic_array_len(foo) to get the length of the array
@@ -226,6 +236,8 @@
*
* For __bitmask(target_cpus, nr_cpumask_bits) use __get_bitmask(target_cpus)
*
+ * For __cpumask(target_cpus) use __get_cpumask(target_cpus)
+ *
*
* Note, that for both the assign and the printk, __entry is the handler
* to the data structure in the ring buffer, and is defined by the
@@ -288,6 +300,7 @@ TRACE_EVENT(foo_bar,
__dynamic_array(int, list, __length_of(lst))
__string( str, string )
__bitmask( cpus, num_possible_cpus() )
+ __cpumask( cpum )
__vstring( vstr, fmt, va )
),
@@ -299,9 +312,10 @@ TRACE_EVENT(foo_bar,
__assign_str(str, string);
__assign_vstr(vstr, fmt, va);
__assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus());
+ __assign_cpumask(cpum, cpumask_bits(mask));
),
- TP_printk("foo %s %d %s %s %s %s (%s) %s", __entry->foo, __entry->bar,
+ TP_printk("foo %s %d %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
/*
* Notice here the use of some helper functions. This includes:
@@ -345,7 +359,8 @@ TRACE_EVENT(foo_bar,
__print_array(__get_dynamic_array(list),
__get_dynamic_array_len(list) / sizeof(int),
sizeof(int)),
- __get_str(str), __get_bitmask(cpus), __get_str(vstr))
+ __get_str(str), __get_bitmask(cpus), __get_cpumask(cpum),
+ __get_str(vstr))
);
/*
@@ -542,15 +557,16 @@ DEFINE_EVENT_PRINT(foo_template, foo_with_template_print,
TRACE_EVENT(foo_rel_loc,
- TP_PROTO(const char *foo, int bar, unsigned long *mask),
+ TP_PROTO(const char *foo, int bar, unsigned long *mask, const cpumask_t *cpus),
- TP_ARGS(foo, bar, mask),
+ TP_ARGS(foo, bar, mask, cpus),
TP_STRUCT__entry(
__rel_string( foo, foo )
__field( int, bar )
__rel_bitmask( bitmask,
BITS_PER_BYTE * sizeof(unsigned long) )
+ __rel_cpumask( cpumask )
),
TP_fast_assign(
@@ -558,10 +574,12 @@ TRACE_EVENT(foo_rel_loc,
__entry->bar = bar;
__assign_rel_bitmask(bitmask, mask,
BITS_PER_BYTE * sizeof(unsigned long));
+ __assign_rel_cpumask(cpumask, cpus);
),
- TP_printk("foo_rel_loc %s, %d, %s", __get_rel_str(foo), __entry->bar,
- __get_rel_bitmask(bitmask))
+ TP_printk("foo_rel_loc %s, %d, %s, %s", __get_rel_str(foo), __entry->bar,
+ __get_rel_bitmask(bitmask),
+ __get_rel_cpumask(cpumask))
);
#endif