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

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Message-ID: <874k1opc6l.fsf@mpe.ellerman.id.au>
Date:   Tue, 17 May 2022 22:37:38 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <patch-notifications@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 0/4] Kill the time spent in patch_instruction()

Christophe Leroy <christophe.leroy@...roup.eu> writes:
> Le 15/05/2022 à 12:28, Michael Ellerman a écrit :
>> 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
>> 
>
> Patch 2 was the keystone of this series. What happened to it ?

It broke on 64-bit. I think I know why but I haven't had time to test
it. Will try and get it fixed in the next day or two.

cheers