492e05b065
To get the defines introduced in the commit aafd4562dfee ("mm: arch:
consolidate mmap hugetlb size encodings"), that doesn't brings anything
interesting for tools/, but also the ones from d2cd9ede6e19 ("mm,fork:
introduce MADV_WIPEONFORK"), which does, and ends up triggering an auto-update
to the tools/perf/trace/beauty/generated/madvise_behavior_array.c file,
supporting the newly introduced 'behavior' values.
This silences this perf build warning:
Warning: Kernel ABI header at 'tools/include/uapi/asm-generic/mman-common.h' differs from latest version at 'include/uapi/asm-generic/mman-common.h'
Testing it:
# cat madvise.c
#include <sys/mman.h>
#include <stdlib.h>
#ifndef MADV_WIPEONFORK
#define MADV_WIPEONFORK 18
#endif
#ifndef MADV_KEEPONFORK
#define MADV_KEEPONFORK 19
#endif
int main(void)
{
void *ptr = mmap(NULL, 4096, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
madvise(ptr, 4096, MADV_WIPEONFORK);
madvise(ptr, 4096, MADV_KEEPONFORK);
return 0;
}
[root@jouet c]# perf trace -e mmap,madvise ./madvise
0.000 ( 0.013 ms): madvise/11732 mmap(len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS ) = 0x7fba6e015000
0.047 ( 0.004 ms): madvise/11732 mmap(len: 160164, prot: READ, flags: PRIVATE, fd: 3 ) = 0x7fba6dfed000
0.084 ( 0.009 ms): madvise/11732 mmap(len: 4000096, prot: EXEC|READ, flags: PRIVATE|DENYWRITE, fd: 3 ) = 0x7fba6da20000
0.109 ( 0.006 ms): madvise/11732 mmap(addr: 0x7fba6dde7000, len: 24576, prot: READ|WRITE, flags: PRIVATE|DENYWRITE|FIXED, fd: 3, off: 1863680) = 0x7fba6dde7000
0.125 ( 0.004 ms): madvise/11732 mmap(addr: 0x7fba6dded000, len: 14688, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS|FIXED) = 0x7fba6dded000
0.150 ( 0.006 ms): madvise/11732 mmap(len: 12288, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS ) = 0x7fba6dfea000
0.288 ( 0.003 ms): madvise/11732 mmap(len: 4096, flags: PRIVATE|ANONYMOUS ) = 0x7fba6e014000
0.292 ( 0.002 ms): madvise/11732 madvise(start: 0x7fba6e014000, len_in: 4096, behavior: MADV_WIPEONFORK) = 0
0.295 ( 0.001 ms): madvise/11732 madvise(start: 0x7fba6e014000, len_in: 4096, behavior: MADV_KEEPONFORK) = 0
# uname -a
Linux jouet 4.13.0+ #2 SMP Mon Sep 18 17:22:46 -03 2017 x86_64 x86_64 x86_64 GNU/Linux
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-yev9rexu02cl7cjeozzmrl9t@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.