About object expiration

[YU Jiazi]

hello,

I have two questions,

1 I want to store some objects never expired even the server memory runs 
out. I know that I can set the object expiration time to 0, but it will 
be removed
when the server runs out of memory. I examined the memcached source code 
and I found the field:

settings.evict_to_free

Does it mean that if i set this field to 0, then those objects 
expiration to set to 0 will not be removed by memcached even the server 
runs out of memory?

2 On top of the question 1, if i set settings.evict_to_free to 0, does 
it effects those objects with expiration time? Will they be removed ?

Thanks