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Message-ID: <AANLkTinVTcQRAgWfMqs9SzG-Zt-0cG-fWBVDKKJ6qwNm@mail.gmail.com>
Date: Fri, 4 Jun 2010 10:55:19 +0200
From: Stephane Eranian <eranian@...gle.com>
To: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
perfmon2-devel@...ts.sf.net, eranian@...il.com, tzanussi@...il.com
Subject: Re: how to use perf annotate on the kernel
Hi,
This patch seems to work now.
Thanks.
On Fri, Jun 4, 2010 at 2:39 AM, Arnaldo Carvalho de Melo
<acme@...radead.org> wrote:
> Em Thu, Jun 03, 2010 at 09:20:39PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Thu, Jun 03, 2010 at 08:18:04PM +0200, Stephane Eranian escreveu:
>> > perf annotate __lock_acquire -k /home/eranian/perfmon/official/tip/build/vmlinux
>> > build id event received for [kernel.kallsyms]:
>> > 5c110a704293a259fbe11158dc1b25107ad7a23e
>> > build id event received for
>> > /lib/modules/2.6.35-rc1-tip/kernel/arch/x86/kernel/cpu/cpufreq/mperf.ko:
>> > cb5
>> > build id event received for
>> > /lib/modules/2.6.35-rc1-tip/kernel/drivers/cpufreq/cpufreq_ondemand.ko:
>> > cdb5
>> > Using /home/eranian/perfmon/official/tip/build/vmlinux for symbols
>> > hist_entry__inc_addr_samples: ip=0xffffffff81073b36
>> > 0xffffffff81073b30 __lock_acquire: period++ [ip: 0xffffffff81073b36, 0x6] => 1
>> > hist_entry__inc_addr_samples: ip=0xffffffff81073c94
>> >
>> > But in the end I get:
>> > objdump: '[kernel.kallsyms]': No such file
>>
>> Reproduced, working on it now. I've been testing only with vmlinux in
>> the path it searches for, not by directly specifying it, will get that
>> fixed, thanks,
>
> Should be fixed by this patch:
>
> [root@...lia ~]# perf annotate -k /lib/modules/2.6.35-rc1/build/vmlinux.OFF n_tty_write | head -50
>
>
> ------------------------------------------------
> Percent | Source code & Disassembly of vmlinux.OFF
> ------------------------------------------------
> :
> :
> :
> : Disassembly of section .text:
> :
> : ffffffff81288820 <n_tty_write>:
> : * lock themselves)
> : */
> :
> : static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
> : const unsigned char *buf, size_t nr)
> : {
> 0.00 : ffffffff81288820: 41 57 push %r15
> :
> : DECLARE_PER_CPU(struct task_struct *, current_task);
> :
> : static __always_inline struct task_struct *get_current(void)
> : {
> : return percpu_read_stable(current_task);
> 0.00 : ffffffff81288822: 65 48 8b 04 25 40 cc mov %gs:0xcc40,%rax
> 0.00 : ffffffff81288829: 00 00
> 0.00 : ffffffff8128882b: 41 56 push %r14
> 0.00 : ffffffff8128882d: 41 55 push %r13
> 0.00 : ffffffff8128882f: 49 89 cd mov %rcx,%r13
> 0.00 : ffffffff81288832: 41 54 push %r12
> 0.00 : ffffffff81288834: 49 89 d4 mov %rdx,%r12
> 0.00 : ffffffff81288837: 55 push %rbp
> 0.00 : ffffffff81288838: 48 89 f5 mov %rsi,%rbp
> 0.00 : ffffffff8128883b: 53 push %rbx
> 0.00 : ffffffff8128883c: 48 89 fb mov %rdi,%rbx
> 0.00 : ffffffff8128883f: 48 83 ec 58 sub $0x58,%rsp
> : const unsigned char *b = buf;
> : DECLARE_WAITQUEUE(wait, current);
> 0.00 : ffffffff81288843: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
> 0.00 : ffffffff8128884a: 00 00
> 7.14 : ffffffff8128884c: 48 c7 44 24 38 00 00 movq $0x0,0x38(%rsp)
> 0.00 : ffffffff81288853: 00 00
> 0.00 : ffffffff81288855: 48 c7 44 24 40 00 00 movq $0x0,0x40(%rsp)
> 0.00 : ffffffff8128885c: 00 00
> 7.14 : ffffffff8128885e: 48 89 44 24 28 mov %rax,0x28(%rsp)
> 0.00 : ffffffff81288863: 48 c7 44 24 30 30 49 movq $0xffffffff81044930,0x30(%rsp)
> 0.00 : ffffffff8128886a: 04 81
> : int c;
> : ssize_t retval = 0;
> :
> [root@...lia ~]#
>
> From 842b66de6807e72bddfd24a63742bacd0f853872 Mon Sep 17 00:00:00 2001
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> Date: Thu, 3 Jun 2010 18:35:55 -0300
> Subject: [PATCH 1/1] perf symbols: Set the DSO long name when using symbol_conf.vmlinux_name
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> We need to set the long name to the name specified via, for instance,
> 'perf annotate --vmlinux /path/to/vmlinux', if not it will remain as
> '[kernel.kallsyms]' and that will make annotate fail when passing this
> as the vmlinux name in the call to objdump.
>
> The way this is setup grew unwieldly and dso__load_vmlinux is the
> function that should allocate space for the long name, with callers not
> assuming that filenames should be allocated somehow by then (strdup,
> dso__build_id_filename, etc).
>
> For now this is the minimalistic patch, a proper fix for .36 will be
> made.
>
> Reported-by: Stephane Eranian <eranian@...gle.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Frédéric Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Mike Galbraith <efault@....de>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Cc: Tom Zanussi <tzanussi@...il.com>
> LKML-Reference: <new-submission>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
> tools/perf/util/symbol.c | 8 ++++++--
> 1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 7fd6b15..b63e571 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1745,7 +1745,12 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
> if (symbol_conf.vmlinux_name != NULL) {
> err = dso__load_vmlinux(self, map,
> symbol_conf.vmlinux_name, filter);
> - goto out_try_fixup;
> + if (err > 0) {
> + dso__set_long_name(self,
> + strdup(symbol_conf.vmlinux_name));
> + goto out_fixup;
> + }
> + return err;
> }
>
> if (vmlinux_path != NULL) {
> @@ -1806,7 +1811,6 @@ do_kallsyms:
> pr_debug("Using %s for symbols\n", kallsyms_filename);
> free(kallsyms_allocated_filename);
>
> -out_try_fixup:
> if (err > 0) {
> out_fixup:
> if (kallsyms_filename != NULL)
> --
> 1.6.5.2
>
>
--
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