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linux/arch/s390/kernel
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Thomas Richter af90d7b69c s390/cpum_sf: remove flag PERF_CPUM_SF_FULL_BLOCKS 
This flag is used to process only fully populated sampling buffers
when an sampling event is stopped on a CPU. By default the last sampling
buffer is also scanned for samples even if the sampling block full
indicator is not set in the trailer entry of a sampling buffer page.

This flag can be set via perf_event_attr::config1 field. It was never
used and never documented. It is useless now.

With PERF_CPUM_SF_FULL_BLOCKS:
When a process is scheduled off the CPU, the sampling is stopped and
the samples are copied to the perf ring buffer and marked invalid.
When stopped at the last full sample buffer page (which is
achieved with the PERF_CPUM_SF_FULL_BLOCKS options), the hardware
sampling will resume at the first free sample entry in the current,
partially filled sample buffer.

Without PERF_CPUM_SF_FULL_BLOCKS (default behavior):
The partially filled last sample buffer is scanned and valid samples
are saved to the perf ring buffer. The valid samples are marked invalid.
The sampling is resumed when the process is scheduled on this CPU.
Again the hardware sampling will resume at the first free sample entry in
the current, partially filled sample buffer.

Now the next interrupt handler invocation scans the
full sample block and saves the valid samples to the ring buffer.
It omits the invalid samples at the top of the buffer.
The default behavior is fully sufficient, therefore remove this feature.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2023-03-27 17:19:52 +02:00
..
syscalls arch: syscalls: simplify uapi/kapi directory creation 2022-03-31 12:03:46 +09:00
vdso32 s390/vdso: use __ALIGN instead of open coded .align 2023-03-20 11:12:47 +01:00
vdso64 s390/vdso: use __ALIGN instead of open coded .align 2023-03-20 11:12:47 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
abs_lowcore.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
alternative.c s390/alternatives: remove padding generation code 2022-05-17 15:16:28 +02:00
asm-offsets.c s390/entry: sort out physical vs virtual pointers usage in sie64a 2022-10-26 14:27:41 +02:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
audit.h
cache.c s390/cache: change type from unsigned long long to unsigned long 2023-01-25 20:51:09 +01:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
compat_linux.c
compat_linux.h s390/compat: cleanup compat_linux.h header file 2022-05-06 20:45:16 +02:00
compat_ptrace.h
compat_signal.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
cpcmd.c s390/cpcmd: use physical address for command and response 2021-10-26 15:21:28 +02:00
cpufeature.c s390/uvdevice: autoload module based on CPU facility 2022-07-19 16:18:49 +02:00
crash_dump.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
debug.c s390: simplify one-level syctl registration for s390dbf_table 2023-03-20 10:56:48 +01:00
diag.c s390/diag: make __diag8c_tmp_amode31 static 2023-02-06 11:13:54 +01:00
dis.c s390/disassembler: update opcode table 2021-12-16 19:58:07 +01:00
dumpstack.c s390/dumpstack: resolve userspace last_break 2023-03-20 10:56:49 +01:00
early.c s390/kasan: move shadow mapping to decompressor 2023-03-20 11:02:51 +01:00
early_printk.c s390/sclp: remove unused sclp_early_printk_forced 2020-09-21 08:08:44 +02:00
earlypgm.S s390: generate register offsets into pt_regs automatically 2022-05-25 11:46:02 +02:00
ebcdic.c
entry.h s390: move __amode31_base declaration to proper header file 2023-01-13 14:15:07 +01:00
entry.S s390/bp: remove __bpon() 2023-03-13 09:16:42 +01:00
fpu.c s390/vx: add vx-insn.h wrapper include file 2022-12-06 16:18:23 +01:00
ftrace.c s390/ftrace: move hotpatch trampolines to mcount.S 2023-03-20 11:12:46 +01:00
ftrace.h s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
guarded_storage.c
head64.S s390/kasan: move shadow mapping to decompressor 2023-03-20 11:02:51 +01:00
idle.c s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
ima_arch.c
ipl.c s390/bp: remove __bpon() 2023-03-13 09:16:42 +01:00
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
irq.c s390/irq,idle: simplify idle check 2023-02-15 11:07:01 +01:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kdebugfs.c
kexec_elf.c
kexec_image.c
kprobes.c s390/kprobes: fix current_kprobe never cleared after kprobes reenter 2023-03-02 15:33:11 +01:00
kprobes.h s390/kprobes: define insn cache ops within private header file 2022-11-23 16:24:07 +01:00
kprobes_insn_page.S s390/kprobes: move insn_page to text segment 2020-10-09 23:45:30 +02:00
lgr.c s390/lgr: use simple assignment instead of memcpy 2022-02-06 23:31:29 +01:00
machine_kexec.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
machine_kexec_file.c s390/kexec: fix ipl report address for kdump 2023-01-10 14:37:02 +01:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
Makefile s390/cpum_cf: merge source files for CPU Measurement counter facility 2023-01-25 20:51:10 +01:00
mcount.S s390/ftrace: move hotpatch trampolines to mcount.S 2023-03-20 11:12:46 +01:00
module.c jump_label: mips: move module NOP patching into arch code 2022-06-24 09:48:55 +02:00
nmi.c s390/mcck: cleanup user process termination path 2023-02-28 13:19:05 +01:00
nospec-branch.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
nospec-sysfs.c s390: introduce nospec_uses_trampoline() 2021-10-26 15:21:29 +02:00
numa.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
os_info.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
perf_cpum_cf.c s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
perf_cpum_cf_events.c s390/cpumf: add new extended counter set for IBM z16 2022-05-16 10:58:33 +02:00
perf_cpum_sf.c s390/cpum_sf: remove flag PERF_CPUM_SF_FULL_BLOCKS 2023-03-27 17:19:52 +02:00
perf_event.c s390/stack: add union to reflect kvm stack slot usages 2022-06-01 12:03:17 +02:00
perf_pai_crypto.c perf/core: Add perf_sample_save_raw_data() helper 2023-01-18 11:57:19 +01:00
perf_pai_ext.c s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c s390: trim ancient junk from copy_thread() 2023-03-13 09:16:42 +01:00
processor.c s390/bp: remove s390_isolate_bp_guest() 2023-03-13 09:16:42 +01:00
ptrace.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
reipl.S
relocate_kernel.S s390/kexec: set end-of-ipl flag in last diag308 call 2022-04-25 13:54:12 +02:00
rethook.c s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
rethook.h s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
runtime_instr.c s390/runtime_instrumentation: fix storage key handling 2020-08-17 13:17:10 +02:00
setup.c s390/boot: rework decompressor reserved tracking 2023-03-20 11:02:50 +01:00
signal.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
smp.c s390/bp: remove __bpon() 2023-03-13 09:16:42 +01:00
stacktrace.c s390/kprobes: replace kretprobe with rethook 2023-01-22 18:42:35 +01:00
sthyi.c s390/sthyi: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
syscall.c s390: add support for BEAR enhancement facility 2021-10-26 15:21:29 +02:00
sysinfo.c s390/extable: move EX_TABLE define to asm-extable.h 2022-03-08 00:33:00 +01:00
text_amode31.S s390/tty3270: add support for diag 8c 2023-01-09 14:33:56 +01:00
time.c s390/stp: clock_delta should be signed 2022-05-11 14:40:57 +02:00
topology.c s390: simplify one-level sysctl registration for topology_ctl_table 2023-03-20 10:56:48 +01:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390/traps: improve panic message for translation-specification exception 2022-03-27 22:18:38 +02:00
unwind_bc.c s390/unwind: avoid duplicated unwinding entries for kretprobes 2022-03-27 22:18:39 +02:00
uprobes.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
uv.c KVM: s390: pv: avoid export before import if possible 2022-11-23 09:06:50 +00:00
vdso.c mm: remove zap_page_range and create zap_vma_pages 2023-01-18 17:12:55 -08:00
vmlinux.lds.S s390/kasan: move shadow mapping to decompressor 2023-03-20 11:02:51 +01:00
vtime.c cputime: remove cputime_to_nsecs fallback 2022-12-27 12:52:17 +01:00