From: Michael Ellerman <mpe@ellerman.id.au>
To: Christophe Leroy <christophe.leroy@csgroup.eu>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] powerpc/8xx: Load modules closer to kernel text
Date: Thu, 01 Apr 2021 00:39:14 +1100 [thread overview]
Message-ID: <87czvf788t.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <db20abbecb129c49d3c663de67dac6a87501ac0b.1617001615.git.christophe.leroy@csgroup.eu>
Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> On the 8xx, TASK_SIZE is 0x80000000. The space between TASK_SIZE and
> PAGE_OFFSET is not used.
>
> Use it to load modules in order to minimise the distance between
> kernel text and modules and avoid trampolines in modules to access
> kernel functions or other module functions.
>
> Define a 16Mbytes area for modules, that's more than enough.
16MB seems kind of small.
At least on 64-bit we could potentially have hundreds of MBs of modules.
cheers
next prev parent reply other threads:[~2021-03-31 13:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 7:07 [PATCH] powerpc/8xx: Load modules closer to kernel text Christophe Leroy
2021-03-31 13:39 ` Michael Ellerman [this message]
2021-03-31 14:12 ` Christophe Leroy
2021-04-01 4:33 ` Michael Ellerman
2021-04-01 13:43 ` Christophe Leroy
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