linux-kernel - Re: [PATCH 0/3] Add support for perf user stack dump in powerpc

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Date:	Thu, 28 Apr 2016 19:53:41 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Chandan Kumar <chandan.kumar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	maddy@...ux.vnet.ibm.com, acme@...hat.com,
	hemant@...ux.vnet.ibm.com, anju@...ux.vnet.ibm.com,
	jolsa@...hat.com
Subject: Re: [PATCH 0/3] Add support for perf user stack dump in powerpc

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@...ux.vnet.ibm.com>

I suppose that implies my testing, but nonetheless:
Tested-by: Naveen N. Rao <naveen.n.rao@...ux.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