Messages in this thread | | | Date | Wed, 18 Jan 2012 12:48:37 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH -tip v4 0/5] perf script: add BTS analysis features |
| |
On Mon, Jan 16, 2012 at 02:21:46PM +0900, Akihiro Nagai wrote: > Hi Frederic, David, > > This patch series adds the functions to analyze BTS logs to perf-script and, > makes perf-script more informative version 4. > The patches add the following functions. > - Unify the expression to "[unknown]" > - Fix BTS record header to resolve DSOs and symbols of user-space > - Resolve DSOs and symbols for BTS's branch_from addresses > - Show the offset of symbols with the 'offs' field specifier. > - Resolve the real path of [kernel.kallsym] using > '--show-kernel-path' option. > > Usage: > First, get the BTS log with the following command. > # perf record -e branches:u -c 1 -d <command> > > Second, analyze that trace data. > # perf script -f ip,addr,sym,offs,dso [--show-kernel-path] > This command's output format is: > <branch_to addr> <branch_to function+offset> <branch_to DSO> <branch_from addr> <branch_from function+offset> <branch_from DSO> > > Output sample: > # perf record -e branches:u -c 1 -d ls > [snip] > # perf script -f ip,addr,sym,dso,offs --show-kernel-path > [snip] > 402c1c main+0x0 (/root/bin/ls) 3430c21399 __libc_start_main+0xe9 (/lib64/libc-2.14.so)
I was confused first, looking for the reason why we have a so strange branch flow until I realized the format is "to from".
Can we have "from to" instead? This will be much more intuitive. "from => to" would be even better.
Thanks!
> 40b390 set_program_name+0x0 (/root/bin/ls) 402c41 main+0x25 (/root/bin/ls) > 40b390 set_program_name+0x0 (/root/bin/ls) ffffffff814ac5ed irq_return+0x0 (/lib/modules/3.2.0+/build/vmlinux) > 401e20 strrchr@plt+0x0 (/root/bin/ls) 40b39e set_program_name+0xe (/root/bin/ls) > 401e26 strrchr@plt+0x6 (/root/bin/ls) 401e20 strrchr@plt+0x0 (/root/bin/ls) > 401b80 _init+0x18 (/root/bin/ls) 401e2b strrchr@plt+0xb (/root/bin/ls) > 3430813850 _dl_runtime_resolve+0x0 (/lib64/ld-2.14.so) 401b86 _init+0x1e (/root/bin/ls) > [snip]
| |