[PATCH] Purge all expired matching objects except the most recent one during hash lookup

[Jingyi Wei]

Hello,

I see that varnish 4.0.2 does not free duplicate objects when ttl is
expired but grace is not expired. Every time when ttl expired it will
fetch a new object and increase memory usage. I set ttl to 1ms and grace
to 1 day and did stress test. Varnish memory usage continued to increase
and soon exceeded the max memory limit, but remained stable at a point.

I made a testing patch on 4.0.2 source release and tried to purge all
expired matching objects except the most recent one during hash lookup,
so the memory of duplicate graced objects will be freed. Any comments?

Thanks,
Jingyi Wei

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