This is a note to let you know that I've just added the patch titled
perf trace: Add mmap alias for s390
to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: perf-trace-add-mmap-alias-for-s390.patch and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Apr 10 13:58:07 CEST 2018
From: Jiri Olsa jolsa@kernel.org Date: Wed, 31 May 2017 13:35:57 +0200 Subject: perf trace: Add mmap alias for s390
From: Jiri Olsa jolsa@kernel.org
[ Upstream commit 54265664c15a68905d8d67d19205e9a767636434 ]
The s390 architecture maps sys_mmap (nr 90) into sys_old_mmap. For this reason perf trace can't find the proper syscall event to get args format from and displays it wrongly as 'continued'.
To fix that fill the "alias" field with "old_mmap" for trace's mmap record to get the correct translation.
Before: 0.042 ( 0.011 ms): vest/43052 fstat(statbuf: 0x3ffff89fd90 ) = 0 0.042 ( 0.028 ms): vest/43052 ... [continued]: mmap()) = 0x3fffd6e2000 0.072 ( 0.025 ms): vest/43052 read(buf: 0x3fffd6e2000, count: 4096 ) = 6
After: 0.045 ( 0.011 ms): fstat(statbuf: 0x3ffff8a0930 ) = 0 0.057 ( 0.018 ms): mmap(arg: 0x3ffff8a0858 ) = 0x3fffd14a000 0.076 ( 0.025 ms): read(buf: 0x3fffd14a000, count: 4096 ) = 6
Signed-off-by: Jiri Olsa jolsa@kernel.org Cc: David Ahern dsahern@gmail.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra a.p.zijlstra@chello.nl Link: http://lkml.kernel.org/r/20170531113557.19175-1-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/builtin-trace.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -1020,6 +1020,10 @@ static struct syscall_fmt { { .name = "mlockall", .errmsg = true, .arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, }, { .name = "mmap", .hexret = true, +/* The standard mmap maps to old_mmap on s390x */ +#if defined(__s390x__) + .alias = "old_mmap", +#endif .arg_scnprintf = { [0] = SCA_HEX, /* addr */ [2] = SCA_MMAP_PROT, /* prot */ [3] = SCA_MMAP_FLAGS, /* flags */
Patches currently in stable-queue which might be from jolsa@kernel.org are
queue-3.18/perf-trace-add-mmap-alias-for-s390.patch queue-3.18/perf-core-correct-event-creation-with-perf_format_group.patch queue-3.18/perf-tests-decompress-kernel-module-before-objdump.patch