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Date: Thu, 15 Mar 2018 15:43:49 +0200
From: Igor Stoppa <igor.stoppa@...wei.com>
To: Matthew Wilcox <willy@...radead.org>
CC: <keescook@...omium.org>, <david@...morbit.com>, <rppt@...ux.vnet.ibm.com>,
<mhocko@...nel.org>, <labbott@...hat.com>,
<linux-security-module@...r.kernel.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>, <kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC PATCH v19 0/8] mm: security: ro protection for dynamic data
On 14/03/2018 19:33, Matthew Wilcox wrote:
> On Wed, Mar 14, 2018 at 06:11:22PM +0200, Igor Stoppa wrote:
[...]
>> Probably page_frag does well with relatively large allocations, while
>> genalloc seems to be better for small (few allocation units) allocations.
>
> I don't understand why you would think that. If you allocate 4096 1-byte
> elements, page_frag will just use up a page. Doing the same thing with
> genalloc requires allocating two bits per byte (1kB of bitmap), plus
> other overheads.
I had misunderstood the amount of page_frag structures needed.
--
igor
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