From: Peter Zijlstra <peterz@infradead.org>
To: Yinan Liu <yinan@linux.alibaba.com>
Cc: rostedt@goodmis.org, mark-pk.tsai@mediatek.com, mingo@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] scripts: ftrace - move the nop-processing in ftrace_init to compile time
Date: Sat, 11 Sep 2021 16:33:52 +0200 [thread overview]
Message-ID: <20210911143352.GA4323@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20210911135043.16014-3-yinan@linux.alibaba.com>
On Sat, Sep 11, 2021 at 09:50:43PM +0800, Yinan Liu wrote:
> When ftrace is enabled, ftrace_init will consume a period of
> time, usually around 15~20ms. Approximately 60% of the time is
> consumed by nop-processing. Moving the nop-processing to the
> compile time can speed up the kernel boot process.
>
> performance test:
> env: Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz
If you use objtool's -M argument instead of recordmcount, you already
get this and you can avoid running recordmcount entirely.
next prev parent reply other threads:[~2021-09-11 14:34 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-11 13:50 [PATCH 0/2] ftrace: improve ftrace during compiling Yinan Liu
2021-09-11 13:50 ` [PATCH 1/2] scripts: ftrace - move the sort-processing in ftrace_init to compile time Yinan Liu
2021-09-11 13:59 ` Steven Rostedt
2021-10-03 13:42 ` Yinan Liu
2021-10-08 23:48 ` Steven Rostedt
2021-10-09 2:56 ` Yinan Liu
2021-10-25 13:20 ` Yinan Liu
2021-10-25 15:00 ` Steven Rostedt
2021-09-11 13:50 ` [PATCH 2/2] scripts: ftrace - move the nop-processing " Yinan Liu
2021-09-11 14:12 ` Steven Rostedt
2021-09-11 15:28 ` Yinan Liu
2021-09-11 16:07 ` Peter Zijlstra
2021-09-11 14:33 ` Peter Zijlstra [this message]
2021-09-11 17:15 ` kernel test robot
2021-09-11 17:15 ` kernel test robot
2021-09-11 18:04 ` kernel test robot
2021-09-11 18:04 ` kernel test robot
2021-11-16 2:49 ` [PATCH v2 0/2] ftrace optimization at " Yinan Liu
2021-11-16 2:49 ` [PATCH v2 1/2] scripts: ftrace - move the sort-processing in ftrace_init to " Yinan Liu
2021-11-16 8:07 ` Peter Zijlstra
2021-11-16 12:42 ` Yinan Liu
2021-11-16 13:05 ` Peter Zijlstra
2021-11-16 14:46 ` Yinan Liu
2021-11-17 13:34 ` kernel test robot
2021-11-17 13:34 ` kernel test robot
2021-11-16 2:49 ` [PATCH v2 2/2] scripts: ftrace - move the nop-processing " Yinan Liu
2021-11-16 8:10 ` Peter Zijlstra
2021-11-16 12:51 ` Yinan Liu
2021-11-16 13:07 ` Steven Rostedt
2021-11-16 15:02 ` Yinan Liu
2021-11-16 16:06 ` Steven Rostedt
2021-11-22 13:43 ` [PATCH v3] scripts: ftrace - move the sort-processing " Yinan Liu
2021-11-23 10:54 ` [PATCH v4] ftrace sorting optimization changelog Yinan Liu
2021-11-23 10:54 ` [PATCH v4] scripts: ftrace - move the sort-processing in ftrace_init to compile time Yinan Liu
2021-11-29 2:13 ` Yinan Liu
2021-11-29 3:51 ` Steven Rostedt
2021-11-29 6:52 ` Yinan Liu
2021-11-30 17:08 ` Steven Rostedt
2021-12-01 5:32 ` [PATCH v5 0/2] ftrace sorting optimization changelog Yinan Liu
2021-12-01 5:32 ` [PATCH v5 1/2] scripts: ftrace - move the sort-processing in ftrace_init to compile time Yinan Liu
2021-12-01 21:45 ` Steven Rostedt
2021-12-05 12:35 ` [scripts] 12955fb1c5: kernel-selftests.livepatch.test-ftrace.sh.fail kernel test robot
2021-12-05 12:35 ` kernel test robot
2021-12-01 5:32 ` [PATCH v5 2/2] script/sorttable: code style improvements Yinan Liu
2021-12-02 2:16 ` [PATCH v6 0/2] ftrace sorting optimization changelog Yinan Liu
2021-12-02 2:16 ` [PATCH v6 1/2] scripts: ftrace - move the sort-processing in ftrace_init Yinan Liu
2021-12-02 17:58 ` Steven Rostedt
2021-12-05 12:45 ` Masami Hiramatsu
2021-12-06 20:18 ` Steven Rostedt
2021-12-07 1:29 ` Yinan Liu
2021-12-02 2:16 ` [PATCH v6 2/2] script/sorttable: code style improvements Yinan Liu
2021-12-02 15:30 ` [PATCH v6 0/2] ftrace sorting optimization changelog Peter Zijlstra
2021-12-07 15:13 ` [PATCH v7 0/2] ftrace sorting optimization Yinan Liu
2021-12-07 15:13 ` [PATCH v7 1/2] scripts: ftrace - move the sort-processing in ftrace_init Yinan Liu
2021-12-11 14:50 ` Steven Rostedt
2021-12-07 15:13 ` [PATCH v7 2/2] script/sorttable: code style improvements Yinan Liu
2021-12-12 11:33 ` [PATCH v8 0/1] change log Yinan Liu
2021-12-12 11:33 ` [PATCH v8] scripts: ftrace - move the sort-processing in ftrace_init Yinan Liu
2022-01-21 9:46 ` Sven Schnelle
2022-01-21 10:42 ` Heiko Carstens
2022-01-21 11:14 ` Sven Schnelle
2022-01-21 11:29 ` Sven Schnelle
2022-01-21 18:11 ` Steven Rostedt
2022-01-22 9:17 ` Heiko Carstens
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