Messages in this thread | | | Date | Thu, 28 Apr 2016 19:53:41 +0530 | From | "Naveen N. Rao" <> | Subject | Re: [PATCH 0/3] Add support for perf user stack dump in powerpc |
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On 2016/04/28 03:01PM, Chandan Kumar wrote: > This patch set enables perf user stack dump on powerpc
For this patch-set: Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
I suppose that implies my testing, but nonetheless: Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
> > Example with "ls" command as user program > ./perf record --call-graph=dwarf,8192 ls > > ./perf script > ---------8< ----- > .. > ... > perf 12549 75938.934539: 1771 cycles:ppp: > 210d90 .perf_event_exec (/boot/vmlinux) > 34b914 .load_elf_binary (/boot/vmlinux) > 2dcabc .search_binary_handler (/boot/vmlinux) > 2dd6f0 .do_execveat_common.isra.28 (/boot/vmlinux) > 2ddcd8 .sys_execve (/boot/vmlinux) > 19258 system_call (/boot/vmlinux)
To expand on this, with upstream libunwind (git://git.sv.gnu.org/libunwind.git) and with debuginfo installed:
# ./perf record -e cycles -g --call-graph dwarf -- find . -iname '*linux*' ./tests/vmlinux-kallsyms.c ./tests/vmlinux-kallsyms.o ./tests/.vmlinux-kallsyms.o.cmd ./util/include/linux [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.371 MB perf.data (45 samples) ] # ./perf script <snip> find 23858 167788.657182: 881967 cycles: 8e758c _cond_resched (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 3f83bc selinux_inode_getattr (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 3ee254 security_inode_getattr (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 3063a4 vfs_getattr (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 306530 vfs_fstatat (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 306c60 sys_newfstatat (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 19210 system_call (/lib/modules/4.6.0-rc3-nnr+/build/vmlinux) 3fffa31829a8 __fxstatat64 (/usr/lib64/libc-2.17.so) 10025ac8 fts_stat.isra.2 (/usr/bin/find) 10027c04 fts_read (/usr/bin/find) 10003e18 find (/usr/bin/find) 100035ec main (/usr/bin/find) 3fffa30a4580 generic_start_main.isra.0 (/usr/lib64/libc-2.17.so) 3fffa30a4774 __libc_start_main (/usr/lib64/libc-2.17.so)
<snip>
Arnaldo, Michael, Can we take this through powerpc/next as well since this pretty much rides on the recent perf regs work?
- Naveen
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