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Commit 164a747f authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: default avatarThomas Richter <tmricht@linux.vnet.ibm.com>
Tested-by: default avatarArnaldo 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 7af7919f

tools/perf/arch/s390/Makefile

+21 −0
Original line number Diff line number Diff line
@@ -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)

tools/perf/arch/s390/entry/syscalls/mksyscalltbl

0 → 100755
+36 −0
Original line number Diff line number Diff line 
#!/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