Messages in this thread | | | Date | Thu, 20 Nov 2014 09:50:09 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH] Repeated fork() causes SLAB to grow without bound |
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On 11/20/2014 09:42 AM, Konstantin Khlebnikov wrote:
> I'm thinking about limitation for reusing anon_vmas which might > increase performance without breaking asymptotic estimation of > count anon_vma in the worst case. For example this heuristic: allow > to reuse only anon_vma with single direct descendant. It seems > there will be arount up to two times more anon_vmas but > false-aliasing must be much lower.
It may even be possible to not create a child anon_vma for the first child a parent forks, but only create a new anon_vma once the parent clones a second child (alive at the same time as the first child).
That still takes care of things like apache or sendmail, but would not create infinite anon_vmas for a task that keeps forking itself to infinite depth without calling exec...
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