linux-kernel - Re:Re:Re: [PATCH] kmalloc_index optimization(add kmalloc max size check)

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Date:   Tue, 21 Apr 2020 10:53:49 +0800 (GMT+08:00)
From:   赵军奎 <bernard@...o.com>
To:     Christopher Lameter <cl@...ux.com>
Cc:     Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel@...o.com
Subject: Re:Re:Re: [PATCH] kmalloc_index optimization(add kmalloc max size check)


发件人：Christopher Lameter <cl@...ux.com>
发送日期：2020-04-20 00:42:55
收件人："赵军奎" <bernard@...o.com>
抄送人：Pekka Enberg <penberg@...nel.org>,David Rientjes <rientjes@...gle.com>,Joonsoo Kim <iamjoonsoo.kim@....com>,Andrew Morton <akpm@...ux-foundation.org>,linux-mm@...ck.org,linux-kernel@...r.kernel.org,kernel@...o.com
主题：Re:Re: [PATCH] kmalloc_index optimization(add kmalloc max size check)>On Sat, 18 Apr 2020, 赵军奎 wrote:
>
>> Sorry for the misunderstanding.
>
>What misunderstanding?
There is no gap now.
>
>> But the current code is not, kmalloc_index will only be BUG() when it exceeds 64M.
>
>Yes that is what you may want to fix as I said.

>You could modify that to check for KMALLOC_MAX_SIZE with some more
>conditionals but then kmalloc_index) is written so that the compiler gets
>constant folding right.
For this point, I am afraid i didn`t catch your idea.
I am not sure how to modify it....
Is there some similar code implementation in the kernel？

BR//bernard