hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
752,022 Commits 9 Branches 1 Tag 4.7 GiB
C 97.7%
Assembly 1.1%
Shell 0.4%
Makefile 0.3%
Python 0.2%
Other 0.1%
Go to file
Thomas Richter b31a8cc1a5 perf test: Adapt test case record+probe_libc_inet_pton.sh for s390 
perf test case 58 (record+probe_libc_inet_pton.sh) executed on s390x
using kernel 4.16.0rc3 displays this result:

 # perf trace --no-syscalls -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
     probe_libc:inet_pton: (3ffa0240448)
	      __GI___inet_pton (/usr/lib64/libc-2.26.so)
	      gaih_inet (inlined)
	      __GI_getaddrinfo (inlined)
	      main (/usr/bin/ping)
	      __libc_start_main (/usr/lib64/libc-2.26.so)
	     _start (/usr/bin/ping)

After I installed kernel 4.16.0 the same tests uses commands:

 # perf record -e probe_libc:inet_pton/call-graph=dwarf/
      -o /tmp/perf.data.abc ping -6 -c 1 ::1
 # perf script -i /tmp/perf.data.abc

and displays:

 ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
	       140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
	       fbde1 gaih_inet (inlined)
	       fe2b9 __GI_getaddrinfo (inlined)
	        398d main (/usr/bin/ping)

Nothing else changed including glibc elfutils and other libraries picked
up by the build.

The entries for __libc_start_main and _start are missing.

I bisected missing __libc_start_main and _start to commit

Fixes: 3d20c62466 ("perf unwind: Unwind with libdw doesn't take symfs into account")

When I undo this commit I get this call stack on s390:
 [root@s35lp76 perf]# ./perf script  -i /tmp/perf.data.abc
 ping 39048 [006] 84230.381198: probe_libc:inet_pton: (3ffa0240448)
	140448 __GI___inet_pton (/usr/lib64/libc-2.26.so)
	 fbde1 gaih_inet (inlined)
	 fe2b9 __GI_getaddrinfo (inlined)
	  398d main (/usr/bin/ping)
	 22fbd __libc_start_main (/usr/lib64/libc-2.26.so)
	  457b _start (/usr/bin/ping)

Looks like dwarf functions dwfl_xxx create different call back stack
trace when using file /usr/lib/debug/usr/bin/ping-20161105-7.fc27.s390x.debug
instead of file /usr/bin/ping.

Fix this test case on s390 and do not expect any call back stack entry
after the main() function. Also be more robust and accept a leading
__GI_ prefix in front of getaddrinfo.

On x86 this test case shows the same call stack using both kernel
versions 4.16.0rc3 and 4.16.0 and also stops at main:

  [root@f27 perf]# ./perf script -i /tmp/perf.data.tmr
  ping  4446 [000]   172.027088: probe_libc:inet_pton: (7fdfa08c93c0)
	             1393c0 __GI___inet_pton (/usr/lib64/libc-2.26.so)
	              fe60d getaddrinfo (/usr/lib64/libc-2.26.so)
	               2f40 main (/usr/bin/ping)
  [root@f27 perf]#

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Martin Vuille <jpmv27@aim.com>
Link: http://lkml.kernel.org/r/20180423082428.7930-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2018-04-23 11:04:37 -03:00
Documentation Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-15 16:12:35 -07:00
LICENSES LICENSES: Add MPL-1.1 license 2018-01-06 10:59:44 -07:00
arch perf/x86/intel/uncore: Fix SBOX support for Broadwell CPUs 2018-04-20 13:17:50 +02:00
block blk-mq: Revert "blk-mq: reimplement blk_mq_hw_queue_mapped" 2018-04-11 07:59:15 -06:00
certs certs/blacklist_nohashes.c: fix const confusion in certs blacklist 2018-02-21 15:35:43 -08:00
crypto Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
drivers SCSI fixes on 20180415 2018-04-15 17:24:12 -07:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs for-4.17-part2-tag 2018-04-15 18:08:35 -07:00
include coresight: Move to SPDX identifier 2018-04-19 12:29:41 -03:00
init Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-15 16:12:35 -07:00
ipc ipc/shm: fix use-after-free of shm file via remap_file_pages() 2018-04-13 17:10:27 -07:00
kernel perf: Remove superfluous allocation error check 2018-04-17 09:47:40 -03:00
lib Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-04-15 16:12:35 -07:00
mm mm, slab: reschedule cache_reap() on the same CPU 2018-04-13 17:10:27 -07:00
net Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
samples remoteproc updates for v4.17 2018-04-10 12:09:27 -07:00
scripts Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
security + Features 2018-04-13 15:38:53 -07:00
sound amdgpu, omap and snd regression fix 2018-04-12 20:56:10 -07:00
tools perf test: Adapt test case record+probe_libc_inet_pton.sh for s390 2018-04-23 11:04:37 -03:00
usr kbuild: rename built-in.o to built-in.a 2018-03-26 02:01:19 +09:00
virt KVM/ARM updates for v4.17 2018-03-28 16:09:09 +02:00
.clang-format clang-format: add configuration file 2018-04-11 10:28:35 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
…
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap Merge candidates for 4.17 merge window 2018-04-06 17:35:43 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE 2018-03-05 16:34:24 +00:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Changes to chrome-platform for v4.17 2018-04-13 16:20:36 -07:00
Makefile Linux 4.17-rc1 2018-04-15 18:24:20 -07:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

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.