Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen

Rik van Riel
2009-05-08T16:06:39Z

Elladan wrote:

>> Nobody (except you) is proposing that we completely disable
>> the eviction of executable pages. I believe that your idea
>> could easily lead to a denial of service attack, with a user
>> creating a very large executable file and mmaping it.
>>
>> Giving executable pages some priority over other file cache
>> pages is nowhere near as dangerous wrt. unexpected side effects
>> and should work just as well.
>
> I don't think this sort of DOS is relevant for a single user or trusted user
> system.

Which not all systems are, meaning that the mechanism
Christoph proposes can never be enabled by default and
would have to be tweaked by the user.

I prefer code that should work just as well 99% of the
time, but can be enabled by default for everybody.
That way people automatically get the benefit.

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