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perf: Tidy up after the big rename

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- provide compatibility Kconfig entry for existing PERF_COUNTERS .config's

 - provide courtesy copy of old perf_counter.h, for user-space projects

 - small indentation fixups

 - fix up MAINTAINERS

 - fix small x86 printout fallout

 - fix up small PowerPC comment fallout (use 'counter' as in register)

Reviewed-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2009-09-21 12:20:38 +02:00
parent cdd6c482c9
commit 57c0c15b52
8 changed files with 534 additions and 76 deletions
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init/Kconfig
+27 -10
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@@ -920,26 +920,31 @@ config HAVE_PERF_EVENTS
help
See tools/perf/design.txt for details.
menu "Performance Counters"
menu "Kernel Performance Events And Counters"
config PERF_EVENTS
bool "Kernel Performance Counters"
default y if PROFILING
bool "Kernel performance events and counters"
default y if (PROFILING || PERF_COUNTERS)
depends on HAVE_PERF_EVENTS
select ANON_INODES
help
Enable kernel support for performance counter hardware.
Enable kernel support for various performance events provided
by software and hardware.
Performance counters are special hardware registers available
on most modern CPUs. These registers count the number of certain
Software events are supported either build-in or via the
use of generic tracepoints.
Most modern CPUs support performance events via performance
counter registers. These registers count the number of certain
types of hw events: such as instructions executed, cachemisses
suffered, or branches mis-predicted - without slowing down the
kernel or applications. These registers can also trigger interrupts
when a threshold number of events have passed - and can thus be
used to profile the code that runs on that CPU.
The Linux Performance Counter subsystem provides an abstraction of
these hardware capabilities, available via a system call. It
The Linux Performance Event subsystem provides an abstraction of
these software and hardware cevent apabilities, available via a
system call and used by the "perf" utility in tools/perf/. It
provides per task and per CPU counters, and it provides event
capabilities on top of those.
@@ -950,14 +955,26 @@ config EVENT_PROFILE
depends on PERF_EVENTS && EVENT_TRACING
default y
help
Allow the use of tracepoints as software performance counters.
Allow the use of tracepoints as software performance events.
When this is enabled, you can create perf counters based on
When this is enabled, you can create perf events based on
tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID
found in debugfs://tracing/events/*/*/id. (The -e/--events
option to the perf tool can parse and interpret symbolic
tracepoints, in the subsystem:tracepoint_name format.)
config PERF_COUNTERS
bool "Kernel performance counters (old config option)"
depends on HAVE_PERF_EVENTS
help
This config has been obsoleted by the PERF_EVENTS
config option - please see that one for details.
It has no effect on the kernel whether you enable
it or not, it is a compatibility placeholder.
Say N if unsure.
endmenu
config VM_EVENT_COUNTERS