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perf s390: Generate system call table from asm/unistd.h 

This should speed up accessing new system calls introduced with
the kernel rather than waiting for libaudit updates to include
them.

Committer testing:

  $ rm -rf /tmp/build/perf
  $ mkdir /tmp/build/perf
  $ make srctree=/home/acme/git/perf -C tools/perf/arch/s390 OUTPUT=/tmp/build/perf/ archheaders
  make: Entering directory '/home/acme/git/perf/tools/perf/arch/s390'
  /bin/sh '/home/acme/git/perf/tools/perf/arch/s390/entry/syscalls//mksyscalltbl' 'cc' /home/acme/git/perf/tools/arch/s390/include/uapi/asm/unistd.h > /tmp/build/perf/arch/s390/include/generated/asm/syscalls_64.c
  make: Leaving directory '/home/acme/git/perf/tools/perf/arch/s390'
  $ head -5 /tmp/build/perf/arch/s390/include/generated/asm/syscalls_64.c
  static const char *syscalltbl_s390_64[] = {
	[1] = "exit",
	[2] = "fork",
	[3] = "read",
	[4] = "write",
  $ tail -5 /tmp/build/perf/arch/s390/include/generated/asm/syscalls_64.c
	[378] = "s390_guarded_storage",
	[379] = "statx",
	[380] = "s390_sthyi",
  };
  #define SYSCALLTBL_S390_64_MAX_ID 380
  $

Now to plug this into 'perf trace' proper.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: linux-s390@vger.kernel.org
LPU-Reference: 1512635281-20733-2-git-send-email-brueckner@linux.vnet.ibm.com
Link: https://lkml.kernel.org/n/tip-h5km60rdg3rqxvsys85q50l3@git.kernel.org
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Hendrik Brueckner 2017-12-07 09:27:59 +01:00 committed by Arnaldo Carvalho de Melo
parent 7af7919f0f
commit 164a747f1a
2 changed files with 57 additions and 0 deletions
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21
tools/perf/arch/s390/Makefile
View File

@ -3,3 +3,24 @@ PERF_HAVE_DWARF_REGS := 1
endif
HAVE_KVM_STAT_SUPPORT := 1
PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
#
# Syscall table generation for perf
#
out := $(OUTPUT)arch/s390/include/generated/asm
header := $(out)/syscalls_64.c
sysdef := $(srctree)/tools/arch/s390/include/uapi/asm/unistd.h
sysprf := $(srctree)/tools/perf/arch/s390/entry/syscalls/
systbl := $(sysprf)/mksyscalltbl
# Create output directory if not already present
_dummy := $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
$(header): $(sysdef) $(systbl)
$(Q)$(SHELL) '$(systbl)' '$(CC)' $(sysdef) > $@
clean::
$(call QUIET_CLEAN, s390) $(RM) $(header)
archheaders: $(header)

36
tools/perf/arch/s390/entry/syscalls/mksyscalltbl Executable file
View File

@ -0,0 +1,36 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Generate system call table for perf
#
#
# Copyright IBM Corp. 2017
# Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
#
gcc=$1
input=$2
if ! test -r $input; then
echo "Could not read input file" >&2
exit 1
fi
create_table()
{
local max_nr
echo 'static const char *syscalltbl_s390_64[] = {'
while read sc nr; do
printf '\t[%d] = "%s",\n' $nr $sc
max_nr=$nr
done
echo '};'
echo "#define SYSCALLTBL_S390_64_MAX_ID $max_nr"
}
$gcc -m64 -E -dM -x c $input \
|sed -ne 's/^#define __NR_//p' \
|sort -t' ' -k2 -nu \
|create_table