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Message-ID: <CAM9d7cj2T4SrwsvZvCmZRh9xLBFvgeaUVqFtkUjakAD-WdL-JQ@mail.gmail.com> Date: Thu, 6 Nov 2014 16:32:34 +0900 From: Namhyung Kim <namhyung@...nel.org> To: "Liang, Kan" <kan.liang@...el.com> Cc: "acme@...nel.org" <acme@...nel.org>, "jolsa@...nel.org" <jolsa@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "andi@...stfloor.org" <andi@...stfloor.org> Subject: Re: [PATCH 1/1] perf tools: perf diff for different binaries Hi Kan, On Thu, Nov 6, 2014 at 2:28 AM, Liang, Kan <kan.liang@...el.com> wrote: > >> Hi Kan, >> >> On Tue, 4 Nov 2014 17:07:43 +0000, Kan Liang wrote: >> >> What about setting the >> >> sort_sym.se_collapse in data_process() so that hists__match() can use >> >> symbol names? >> > >> > Yes, we can set it if we only do function level diff. But I'd like to >> > keep both. So I defined two sort keys. >> > "symbol" means "symbol address executed at the time of sample " >> > "symbol_name" means "name of function executed at the time of >> sample" >> >> Hmm.. I don't think the symbol sort key provides the instruction level diff >> that you want. If it finds a symbol it just use the start address of the >> symbol, not the exact address of the sample. Am I missing something? >> > > No, the meaning of symbol in perf diff is different as in perf report. It uses > the exact address of the sample. Hmm.. are you sure? I think it uses same code.. > > Here is current perf diff result and objdump fragment of the first binary. > You can see the exact address of the sample in function f3 was used, not the > start address. > 33.55% [unknown] [.] 0x0000000000400554 > 48.13% [unknown] [.] 0x000000000040056b But I think it's because it failed to find a symbol (f3) for some reason. The symbol sort key will use the ip address only if it didn't find a symbol for the address. Please see sort__sym_cmp (and _sort__sym_cmp too). Thanks, Namhyung > > [perf-test]#./perf diff -s dso,symbol --compute ratio ../../../v1_1_6perf.data > ../../../v2_1_7perf.data > # Event 'cycles' > # > # Baseline Ratio Shared Object Symbol > # ........ .............. ................. ......................... > # > [kernel.kallsyms] [k] __update_cpu_load > [kernel.kallsyms] [k] mod_timer > 0.01% [kernel.kallsyms] [k] native_write_msr_safe > 0.01% [kernel.kallsyms] [k] notifier_call_chain > 0.01% [kernel.kallsyms] [k] perf_event_task_tick > [kernel.kallsyms] [k] rt_mutex_slowlock > 0.01% [kernel.kallsyms] [k] run_posix_cpu_timers > 0.01% [kernel.kallsyms] [k] run_timer_softirq > 0.01% [kernel.kallsyms] [k] trigger_load_balance > 0.01% [kernel.kallsyms] [k] update_vsyscall > [kernel.kallsyms] [k] wait_for_common > [kernel.kallsyms] [k] 0x000000000028482a > 0.05% [unknown] [.] 0x0000000000400540 > 0.04% [unknown] [.] 0x0000000000400541 > 0.03% [unknown] [.] 0x000000000040054b > 0.04% [unknown] [.] 0x0000000000400552 > 33.55% [unknown] [.] 0x0000000000400554 > 1.22% [unknown] [.] 0x000000000040055a > 8.00% [unknown] [.] 0x000000000040055e > 0.02% [unknown] [.] 0x0000000000400562 > 8.41% [unknown] [.] 0x0000000000400564 > 48.13% [unknown] [.] 0x000000000040056b > 0.16% [unknown] [.] 0x0000000000400570 > 0.17% [unknown] [.] 0x0000000000400571 > [unknown] [.] 0x0000000000400580 > [unknown] [.] 0x0000000000400581 > 0.01% [unknown] [.] 0x0000000000400583 > 0.01% [unknown] [.] 0x0000000000400588 > [unknown] [.] 0x000000000040058b > 0.01% 1240.990221 [unknown] [.] 0x000000000040058d > [unknown] [.] 0x0000000000400590 > 0.06% [unknown] [.] 0x0000000000400591 > [unknown] [.] 0x0000000000400593 > 0.04% [unknown] [.] 0x0000000000400595 > 0.01% 1240.603148 [unknown] [.] 0x0000000000400597 > [unknown] [.] 0x000000000040059b > [unknown] [.] 0x000000000040059d > [unknown] [.] 0x00000000004005a1 > [unknown] [.] 0x00000000004005a5 > [unknown] [.] 0x00000000004005a7 > [unknown] [.] 0x00000000004005a8 > [unknown] [.] 0x00000000004005aa > [unknown] [.] 0x00000000004005ba > [unknown] [.] 0x00000000004005bf > [unknown] [.] 0x00000000004005c4 > [unknown] [.] 0x00000000004005c9 > [unknown] [.] 0x00000000004005ce > [unknown] [.] 0x00000000004005d2 > [unknown] [.] 0x00000000004005d6 > [unknown] [.] 0x00000000004005d8 > [unknown] [.] 0x00000000004005f5 > > > [perf-test]#objdump -d tchain_edit_1 > > 0000000000400540 <f3>: > 400540: 55 push %rbp > 400541: 48 89 e5 mov %rsp,%rbp > 400544: c7 45 f8 e8 03 00 00 movl $0x3e8,-0x8(%rbp) > 40054b: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%rbp) > 400552: eb 14 jmp 400568 <f3+0x28> > 400554: 8b 45 fc mov -0x4(%rbp),%eax > 400557: 83 e0 01 and $0x1,%eax > 40055a: 85 c0 test %eax,%eax > 40055c: 74 06 je 400564 <f3+0x24> > 40055e: 83 45 fc 01 addl $0x1,-0x4(%rbp) > 400562: eb 04 jmp 400568 <f3+0x28> > 400564: 83 45 fc 01 addl $0x1,-0x4(%rbp) > 400568: 8b 45 fc mov -0x4(%rbp),%eax > 40056b: 3b 45 f8 cmp -0x8(%rbp),%eax > 40056e: 7c e4 jl 400554 <f3+0x14> > 400570: 5d pop %rbp > 400571: c3 retq > > > Thanks, > Kan > >> Thanks, >> Namhyung -- Thanks, Namhyung -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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