Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Chase Douglas e330b3bcd8 tracing: Show sample std dev in function profiling ... When combined with function graph tracing the ftrace function profiler also prints the average run time of functions. While this gives us some good information, it doesn't tell us anything about the variance of the run times of the function. This change prints out the s^2 sample standard deviation alongside the average. This change adds one entry to the profile record structure. This increases the memory footprint of the function profiler by 1/3 on a 32-bit system, and by 1/5 on a 64-bit system when function graphing is enabled, though the memory is only allocated when the profiler is turned on. During the profiling, one extra line of code adds the squared calltime to the new record entry, so this should not adversly affect performance. Note that the square of the sample standard deviation is printed because there is no sqrt implementation for unsigned long long in the kernel. Signed-off-by: Chase Douglas <chase.douglas@canonical.com> LKML-Reference: <1272304925-2436-1-git-send-email-chase.douglas@canonical.com> [ fixed comment about ns^2 -> us^2 conversion ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2010-04-27 18:23:15 -04:00
..
blktrace.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ftrace.c	tracing: Show sample std dev in function profiling	2010-04-27 18:23:15 -04:00
Kconfig	Merge branch 'tracing/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/core	2010-02-27 10:06:10 +01:00
kmemtrace.c	kmemtrace: Fix up tracer registration	2009-10-01 11:53:44 +02:00
Makefile	perf: Drop the obsolete profile naming for trace events	2010-03-10 14:47:18 +01:00
power-traces.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ring_buffer.c	ring-buffer: Make non-consuming read less expensive with lots of cpus.	2010-04-27 13:06:35 -04:00
ring_buffer_benchmark.c	ring-buffer: Make benchmark handle missed events	2010-04-27 13:26:58 -04:00
trace.c	ring-buffer: Make non-consuming read less expensive with lots of cpus.	2010-04-27 13:06:35 -04:00
trace.h	tracing: Add graph output support for irqsoff tracer	2010-04-27 12:36:53 -04:00
trace_boot.c	tracing: add filter event logic to special, mmiotrace and boot tracers	2009-09-12 23:34:04 -04:00
trace_branch.c	tracing: Add correct/incorrect to sort keys for branch annotation output	2010-02-09 21:35:05 -05:00
trace_clock.c	tracing: Fix lockdep warning in global_clock()	2010-03-29 15:16:44 -04:00
trace_entries.h	hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf events	2009-11-08 15:34:42 +01:00
trace_event_perf.c	perf: Correctly align perf event tracing buffer	2010-04-01 08:26:30 +02:00
trace_events.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_events_filter.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_export.c	tracing: Remove show_format and related macros from TRACE_EVENT	2010-01-06 12:08:46 -05:00
trace_functions.c	tracing: switch function prints from %pf to %ps	2009-09-17 15:53:40 -04:00
trace_functions_graph.c	tracing: Add graph output support for irqsoff tracer	2010-04-27 12:36:53 -04:00
trace_hw_branches.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2009-12-14 09:58:24 -08:00
trace_irqsoff.c	tracing: Add graph output support for irqsoff tracer	2010-04-27 12:36:53 -04:00
trace_kprobe.c	perf: Drop the obsolete profile naming for trace events	2010-03-10 14:47:18 +01:00
trace_ksym.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_mmiotrace.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_nop.c
trace_output.c	tracing: Add full state to trace_seq	2009-12-09 14:05:49 -05:00
trace_output.h	tracing: consolidate code between trace_output.c and trace_function_graph.c	2009-09-11 14:24:13 -04:00
trace_printk.c	tracing: Remove markers	2009-09-18 21:22:08 +02:00
trace_sched_switch.c	tracing: pass around ring buffer instead of tracer	2009-09-04 18:59:39 -04:00
trace_sched_wakeup.c	locking: Convert __raw_spin* functions to arch_spin*	2009-12-14 23:55:32 +01:00
trace_selftest.c	tracing: Dump either the oops's cpu source or all cpus buffers	2010-04-21 23:11:42 +02:00
trace_selftest_dynamic.c
trace_stack.c	tracing: Fix circular dead lock in stack trace	2010-02-02 10:20:18 -05:00
trace_stat.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_stat.h
trace_syscalls.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_sysprof.c	perf events, x86/stacktrace: Make stack walking optional	2009-12-17 09:56:19 +01:00
trace_workqueue.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00