perf trace beauty: Beautify pkey_{alloc,free,mprotect} arguments
authorArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 28 Aug 2017 14:47:11 +0000 (11:47 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 28 Aug 2017 19:44:47 +0000 (16:44 -0300)
commit83bc9c371eaf21466f43b12d942b66c3f0d60ae5
treef5a8a1da05646b72b2ced2a810c7f83d5ce4d9d1
parenta2105f8a9c38f8298f501cf1cd3218407ecdb1a1
perf trace beauty: Beautify pkey_{alloc,free,mprotect} arguments

Reuse 'mprotect' beautifiers for 'pkey_mprotect'.

System wide tracing pkey_alloc, pkey_free and pkey_mprotect calls, with
backtraces:

  # perf trace -e pkey_alloc,pkey_mprotect,pkey_free --max-stack=5
     0.000 ( 0.011 ms): pkey/7818 pkey_alloc(init_val: DISABLE_ACCESS|DISABLE_WRITE) = -1 EINVAL Invalid argument
                                       syscall (/usr/lib64/libc-2.25.so)
                                       pkey_alloc (/home/acme/c/pkey)
     0.022 ( 0.003 ms): pkey/7818 pkey_mprotect(start: 0x7f28c3890000, len: 4096, prot: READ|WRITE, pkey: -1) = 0
                                       syscall (/usr/lib64/libc-2.25.so)
                                       pkey_mprotect (/home/acme/c/pkey)
     0.030 ( 0.002 ms): pkey/7818 pkey_free(pkey: -1                               ) = -1 EINVAL Invalid argument
                                       syscall (/usr/lib64/libc-2.25.so)
                                       pkey_free (/home/acme/c/pkey)

The tools/include/uapi/asm-generic/mman-common.h file is used to find
the access rights defines for the pkey_alloc syscall second argument.

Since we have the detector of changes for the tools/include header files
versus its kernel origin (include/uapi/asm-generic/mman-common.h), we'll
get whatever new flag appears for that argument automatically.

This method should be used in other cases where it is easy to generate
those flags tables because the header has properly namespaced defines
like PKEY_DISABLE_ACCESS and PKEY_DISABLE_WRITE.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-3xq5312qlks7wtfzv2sk3nct@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/Makefile.perf
tools/perf/builtin-trace.c
tools/perf/trace/beauty/Build
tools/perf/trace/beauty/beauty.h
tools/perf/trace/beauty/pkey_alloc.c [new file with mode: 0644]
tools/perf/trace/beauty/pkey_alloc_access_rights.sh [new file with mode: 0755]