linux-kernel - Re: [PATCH v1 0/4] Kill the time spent in patch

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Message-Id: <165261053687.1047019.4165741740473209888.b4-ty@ellerman.id.au>
Date:   Sun, 15 May 2022 20:28:56 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/4] Kill the time spent in patch_instruction()

On Tue, 22 Mar 2022 16:40:17 +0100, Christophe Leroy wrote:
> This series reduces by 70% the time required to activate
> ftrace on an 8xx with CONFIG_STRICT_KERNEL_RWX.
> 
> Measure is performed in function ftrace_replace_code() using mftb()
> around the loop.
> 
> With the series,
> - Without CONFIG_STRICT_KERNEL_RWX, 416000 TB ticks are measured.
> - With CONFIG_STRICT_KERNEL_RWX, 546000 TB ticks are measured.
> 
> [...]

Patches 1, 3 and 4 applied to powerpc/next.

[1/4] powerpc/code-patching: Don't call is_vmalloc_or_module_addr() without CONFIG_MODULES
      https://git.kernel.org/powerpc/c/cb3ac45214c03852430979a43180371a44b74596
[3/4] powerpc/code-patching: Use jump_label for testing freed initmem
      https://git.kernel.org/powerpc/c/b033767848c4115e486b1a51946de3bee2ac0fa6
[4/4] powerpc/code-patching: Use jump_label to check if poking_init() is done
      https://git.kernel.org/powerpc/c/1751289268ef959db68b0b6f798d904d6403309a

cheers