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e4b8b3f33f
linux-next/arch/s390/kernel
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Jan Glauber e4b8b3f33f s390: add support for runtime instrumentation 
Allow user-space threads to use runtime instrumentation (RI). To enable RI
for a thread there is a new s390 specific system call, sys_s390_runtime_instr,
that takes as parameter a realtime signal number. If the RI facility is
available the system call sets up a control block for the calling thread with
the appropriate permissions for the thread to modify the control block.

The user-space thread can then use the store and modify RI instructions to
alter the control block and start/stop the instrumentation via RION/RIOFF.

If the user specified program buffer runs full RI triggers an external
interrupt. The external interrupt is translated to a real-time signal that
is delivered to the thread that enabled RI on that CPU. The number of
the real-time signal is the number specified in the RI system call. So,
user-space can select any available real-time signal number in case the
application itself uses real-time signals for other purposes.

The kernel saves the RI control blocks on task switch only if the running
thread was enabled for RI. Therefore, the performance impact on task switch
should be negligible if RI is not used.

RI is only enabled for user-space mode and is disabled for the supervisor
state.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-09-26 15:45:02 +02:00
..
vdso32 s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
vdso64 s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
.gitignore s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
asm-offsets.c s390/vtimer: rework virtual timer interface 2012-07-20 11:15:08 +02:00
audit.c
audit.h
base.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
bitmap.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
cache.c s390/cache: expose cpu cache topology via sysfs 2012-09-26 15:44:51 +02:00
compat_audit.c
compat_exec_domain.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
compat_linux.c s390/compat: fix mmap compat system calls 2012-08-08 07:32:57 -07:00
compat_linux.h Mark arguments to certain syscalls as being const 2010-08-13 16:53:13 -07:00
compat_ptrace.h [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
compat_signal.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
compat_wrapper.S s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
cpcmd.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
crash_dump.c [S390] kernel: Add OS info memory interface 2012-03-11 11:59:29 -04:00
debug.c s390/debug: remove module_exit function / move EXPORT_SYMBOLs 2012-07-26 10:07:25 +02:00
diag.c [S390] replace diag10() with diag10_range() function 2011-05-10 17:13:43 +02:00
dis.c s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
early.c s390: enable large page support with CONFIG_DEBUG_PAGEALLOC 2012-09-26 15:44:50 +02:00
ebcdic.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
entry64.S s390/vtimer: rework virtual timer interface 2012-07-20 11:15:08 +02:00
entry.h s390/vtimer: rework virtual timer interface 2012-07-20 11:15:08 +02:00
entry.S s390/vtimer: rework virtual timer interface 2012-07-20 11:15:08 +02:00
ftrace.c [S390] cleanup ftrace backend functions 2011-01-05 12:47:31 +01:00
head31.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
head64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
head_kdump.S s390/sigp: use sigp order code defines in assembly code 2012-06-05 13:23:36 +02:00
head.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
ipl.c s390/ipl: Use diagnose 8 command separation 2012-07-26 10:07:26 +02:00
irq.c s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
jump_label.c s390/jump-label: add arch_jump_label_transform_static() 2011-10-25 11:54:37 -07:00
kprobes.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
lgr.c s390/lgr: Add init check to lgr_info_log() 2012-07-20 11:15:01 +02:00
machine_kexec.c s390/kexec: move machine_crash_shutdown() to machine_kexec.c 2012-09-26 15:44:54 +02:00
Makefile s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
mcount64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
mcount.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
mem_detect.c [S390] Rework create_mem_hole() function 2011-12-27 11:27:09 +01:00
module.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
nmi.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
os_info.c s390/smp: make absolute lowcore / cpu restart parameter accesses more robust 2012-06-14 09:09:02 +02:00
perf_cpum_cf.c s390/irq: split irq stats for cpu-measurement alert facilities 2012-05-23 17:06:52 +02:00
perf_event.c [S390] Fix build errors (fallout from system.h disintegration) 2012-03-30 09:41:12 +02:00
process.c s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
processor.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
ptrace.c s390/seccomp: add support for system call filtering using BPF 2012-08-08 07:32:56 -07:00
reipl64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
reipl.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
relocate_kernel64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
relocate_kernel.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
runtime_instr.c s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
s390_ksyms.c s390/string: provide asm lib functions for memcpy and memcmp 2012-09-26 15:44:50 +02:00
sclp.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
setup.c s390/hwcaps: do not report high gprs for 31 bit kernel 2012-09-10 09:53:52 +02:00
signal.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
smp.c s390/cpu hotplug: mask out CPU_TASKS_FROZEN in cu hotplug notifiers 2012-09-26 15:44:53 +02:00
stacktrace.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
suspend.c Disintegrate asm/system.h for S390 2012-03-28 18:30:02 +01:00
swsusp_asm64.S s390/sigp: use sigp order code defines in assembly code 2012-06-05 13:23:36 +02:00
sys_s390.c s390: do not clobber personality flags in sys_32_personality() 2012-08-08 07:32:56 -07:00
syscalls.S s390: add support for runtime instrumentation 2012-09-26 15:45:02 +02:00
sysinfo.c s390/cpu: remove cpu "capabilities" sysfs attribute 2012-05-30 09:07:30 +02:00
time.c s390/vtimer: rework virtual timer interface 2012-07-20 11:15:08 +02:00
topology.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
traps.c s390: make use of user_mode() macro where possible 2012-07-30 11:03:12 +02:00
vdso.c s390/mm: rename user_mode variable to addressing_mode 2012-07-30 11:03:11 +02:00
vmlinux.lds.S s390/linker script: use RO_DATA_SECTION 2012-07-26 10:07:25 +02:00
vtime.c s390/cpu hotplug: mask out CPU_TASKS_FROZEN in cu hotplug notifiers 2012-09-26 15:44:53 +02:00