From: Thomas <74cmonty@gmail.com>
To: "Alex Bennée" <alex.bennee@linaro.org>
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Andrew Baumann" <Andrew.Baumann@microsoft.com>,
"QEMU Developers" <qemu-devel@nongnu.org>,
qemu-arm <qemu-arm@nongnu.org>,
"Paul Zimmerman" <pauldzim@gmail.com>
Subject: Re: Emulate Rpi with QEMU fails
Date: Thu, 8 Oct 2020 09:00:22 +0200 [thread overview]
Message-ID: <2e3754fb-8b3c-4ef2-989f-a0015ef3a7e8@gmail.com> (raw)
In-Reply-To: <87362q1bxl.fsf@linaro.org>
Interesting enough is: my top figure reported by perf is like yours:
Samples: 6M of event 'cycles:u', Event count (approx.): 1936571734942
Overhead Command Shared Object Symbol
7,95% qemu-system-arm qemu-system-arm [.]
helper_lookup_tb_ptr
◆
4,16% qemu-system-arm qemu-system-arm [.]
cpu_get_tb_cpu_state
▒
2,52% qemu-system-arm libpthread-2.32.so [.]
__pthread_mutex_lock
▒
2,06% qemu-system-arm qemu-system-arm [.]
qht_lookup_custom
▒
1,66% qemu-system-arm qemu-system-arm [.]
tlb_set_page_with_attrs
▒
1,61% qemu-system-arm libpthread-2.32.so [.]
__pthread_mutex_unlock_usercnt
▒
1,59% qemu-system-arm qemu-system-arm [.]
get_phys_addr
▒
1,27% qemu-system-arm qemu-system-arm [.]
cpu_exec
▒
1,23% qemu-system-arm qemu-system-arm [.]
object_class_dynamic_cast_assert
▒
0,98% qemu-system-arm libc-2.32.so [.]
_int_malloc
▒
0,95% qemu-system-arm qemu-system-arm [.]
object_dynamic_cast_assert
▒
0,95% qemu-system-arm qemu-system-arm [.]
tb_htable_lookup
▒
0,92% qemu-system-arm qemu-system-arm [.]
tcg_gen_code
▒
0,91% qemu-system-arm qemu-system-arm [.]
qemu_mutex_lock_impl
▒
0,75% qemu-system-arm qemu-system-arm [.]
get_page_addr_code_hostp
▒
0,73% qemu-system-arm qemu-system-arm [.]
tcg_optimize
▒
0,71% qemu-system-arm qemu-system-arm [.]
qemu_mutex_unlock_impl
▒
0,69% qemu-system-arm libc-2.32.so [.]
_int_free
▒
0,64% qemu-system-arm qemu-system-arm [.]
tb_flush_jmp_cache
▒
0,63% qemu-system-arm qemu-system-arm [.]
address_space_ldl_le
▒
0,62% qemu-system-arm libpthread-2.32.so [.]
__lll_lock_wait
▒
0,58% qemu-system-arm libpthread-2.32.so [.]
pthread_cond_wait@@GLIBC_2.3.2
▒
0,52% qemu-system-arm qemu-system-arm [.]
cpu_reset_interrupt
▒
0,52% qemu-system-arm libc-2.32.so [.]
cfree@GLIBC_2.2.5
▒
0,52% qemu-system-arm qemu-system-arm [.]
qemu_set_irq
▒
However the absolute time is 3-4 minutes.
And I don't know where I should start optimization now.
Am 07.10.20 um 14:02 schrieb Alex Bennée:
> Thomas Schneider <74cmonty@gmail.com> writes:
>
>> Are you referring to this tool?
>> https://github.com/stefano-garzarella/qemu-boot-time
>> <https://github.com/stefano-garzarella/qemu-boot-time>
> No - just plain perf:
>
> perf record $QEMU $ARGS
>
> Then a "perf report" which will show you the hotspots, for example:
>
> 8.92% qemu-system-aar qemu-system-aarch64 [.] helper_lookup_tb_ptr
> 4.76% qemu-system-aar qemu-system-aarch64 [.] liveness_pass_1
> 3.69% qemu-system-aar qemu-system-aarch64 [.] tcg_gen_code
> 2.95% qemu-system-aar qemu-system-aarch64 [.] qht_lookup_custom
> 2.93% qemu-system-aar qemu-system-aarch64 [.] tcg_optimize
> 1.28% qemu-system-aar qemu-system-aarch64 [.] tcg_out_opc.isra.15
> 1.09% qemu-system-aar qemu-system-aarch64 [.] get_phys_addr_lpae
> 1.09% qemu-system-aar [kernel.kallsyms] [k] isolate_freepages_block
> 1.05% qemu-system-aar qemu-system-aarch64 [.] cpu_get_tb_cpu_state
> 0.98% qemu-system-aar [kernel.kallsyms] [k] do_syscall_64
> 0.94% qemu-system-aar qemu-system-aarch64 [.] tb_lookup_cmp
> 0.78% qemu-system-aar qemu-system-aarch64 [.] init_ts_info
> 0.73% qemu-system-aar qemu-system-aarch64 [.] tb_htable_lookup
> 0.73% qemu-system-aar qemu-system-aarch64 [.] tb_gen_code
> 0.73% qemu-system-aar qemu-system-aarch64 [.] tlb_set_page_with_attrs
>
>>
>> Am 07.10.2020 um 13:00 schrieb Alex Bennée:
>>> perf to record your boot
>
next prev parent reply other threads:[~2020-10-08 7:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-03 11:45 Emulate Rpi with QEMU fails Thomas
2020-10-04 17:44 ` Alex Bennée
2020-10-04 18:40 ` Peter Maydell
2020-10-05 9:40 ` Alex Bennée
2020-10-05 10:51 ` Thomas Schneider
2020-10-05 22:08 ` Paul Zimmerman
2020-10-06 6:58 ` Thomas Schneider
2020-10-06 7:42 ` Paul Zimmerman
2020-10-06 9:58 ` Alex Bennée
2020-10-07 6:28 ` Thomas
2020-10-07 6:50 ` Paul Zimmerman
2020-10-07 7:27 ` Thomas Schneider
2020-10-07 11:00 ` Alex Bennée
2020-10-07 11:36 ` Thomas Schneider
2020-10-07 12:02 ` Alex Bennée
2020-10-08 7:00 ` Thomas [this message]
2020-10-08 21:07 ` Paul Zimmerman
2020-10-09 2:21 ` Paul Zimmerman
2020-10-09 6:20 ` Alex Bennée
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