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-rw-r--r--init/Kconfig71
-rw-r--r--init/main.c12
2 files changed, 53 insertions, 30 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 0121c0e..09c5c64 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -916,31 +916,41 @@ config AIO
by some high performance threaded applications. Disabling
this option saves about 7k.
-config HAVE_PERF_COUNTERS
+config HAVE_PERF_EVENTS
bool
help
See tools/perf/design.txt for details.
-menu "Performance Counters"
+config PERF_USE_VMALLOC
+ bool
+ help
+ See tools/perf/design.txt for details
-config PERF_COUNTERS
- bool "Kernel Performance Counters"
- default y if PROFILING
- depends on HAVE_PERF_COUNTERS
+menu "Kernel Performance Events And Counters"
+
+config PERF_EVENTS
+ 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.
+
+ Software events are supported either build-in or via the
+ use of generic tracepoints.
- Performance counters are special hardware registers available
- on most modern CPUs. These registers count the number of certain
+ 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.
@@ -948,17 +958,42 @@ config PERF_COUNTERS
config EVENT_PROFILE
bool "Tracepoint profiling sources"
- depends on PERF_COUNTERS && EVENT_TRACING
+ 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.
+
+config DEBUG_PERF_USE_VMALLOC
+ default n
+ bool "Debug: use vmalloc to back perf mmap() buffers"
+ depends on PERF_EVENTS && DEBUG_KERNEL
+ select PERF_USE_VMALLOC
+ help
+ Use vmalloc memory to back perf mmap() buffers.
+
+ Mostly useful for debugging the vmalloc code on platforms
+ that don't require it.
+
+ Say N if unsure.
+
endmenu
config VM_EVENT_COUNTERS
@@ -989,14 +1024,6 @@ config SLUB_DEBUG
SLUB sysfs support. /sys/slab will not exist and there will be
no support for cache validation etc.
-config STRIP_ASM_SYMS
- bool "Strip assembler-generated symbols during link"
- default n
- help
- Strip internal assembler-generated symbols during a link (symbols
- that look like '.Lxxx') so they don't pollute the output of
- get_wchan() and suchlike.
-
config COMPAT_BRK
bool "Disable heap randomization"
default y
diff --git a/init/main.c b/init/main.c
index 833d675..5988deb 100644
--- a/init/main.c
+++ b/init/main.c
@@ -18,7 +18,6 @@
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/delay.h>
-#include <linux/utsname.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
@@ -68,6 +67,7 @@
#include <linux/async.h>
#include <linux/kmemcheck.h>
#include <linux/kmemtrace.h>
+#include <linux/sfi.h>
#include <linux/shmem_fs.h>
#include <trace/boot.h>
@@ -359,11 +359,6 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
#else
-#if NR_CPUS > BITS_PER_LONG
-cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL;
-EXPORT_SYMBOL(cpu_mask_all);
-#endif
-
/* Setup number of possible processor ids */
int nr_cpu_ids __read_mostly = NR_CPUS;
EXPORT_SYMBOL(nr_cpu_ids);
@@ -668,12 +663,12 @@ asmlinkage void __init start_kernel(void)
#endif
thread_info_cache_init();
cred_init();
- fork_init(num_physpages);
+ fork_init(totalram_pages);
proc_caches_init();
buffer_init();
key_init();
security_init();
- vfs_caches_init(num_physpages);
+ vfs_caches_init(totalram_pages);
radix_tree_init();
signals_init();
/* rootfs populating might need page-writeback */
@@ -689,6 +684,7 @@ asmlinkage void __init start_kernel(void)
check_bugs();
acpi_early_init(); /* before LAPIC and SMP init */
+ sfi_init_late();
ftrace_init();
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