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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Christophe Leroy <christophe.leroy@csgroup.eu>,
        Michael Ellerman <patch-notifications@ellerman.id.au>,
        Paul Mackerras <paulus@samba.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc:     "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 0/4] Kill the time spent in patch_instruction()
In-Reply-To: <f1481139-9ed6-3e00-e73e-87d4319c614d@csgroup.eu>
References: <cover.1647962456.git.christophe.leroy@csgroup.eu>
 <165261053687.1047019.4165741740473209888.b4-ty@ellerman.id.au>
 <f1481139-9ed6-3e00-e73e-87d4319c614d@csgroup.eu>
Date:   Tue, 17 May 2022 22:37:38 +1000
Message-ID: <874k1opc6l.fsf@mpe.ellerman.id.au>
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Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> Le 15/05/2022 =C3=A0 12:28, Michael Ellerman a =C3=A9crit=C2=A0:
>> 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.
>>>
>>> [...]
>>=20
>> Patches 1, 3 and 4 applied to powerpc/next.
>>=20
>> [1/4] powerpc/code-patching: Don't call is_vmalloc_or_module_addr() with=
out CONFIG_MODULES
>>        https://git.kernel.org/powerpc/c/cb3ac45214c03852430979a43180371a=
44b74596
>> [3/4] powerpc/code-patching: Use jump_label for testing freed initmem
>>        https://git.kernel.org/powerpc/c/b033767848c4115e486b1a51946de3be=
e2ac0fa6
>> [4/4] powerpc/code-patching: Use jump_label to check if poking_init() is=
 done
>>        https://git.kernel.org/powerpc/c/1751289268ef959db68b0b6f798d904d=
6403309a
>>=20
>
> 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