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A comment on I think tumblr has a huge security hole. Parent comment

Re:I think tumblr has a huge security hole by Kudos on Saturday March 19, 2011 @09:47AM (#2343558)
Sure there is, APC. But that aside, Linux won't read that file every time, it will end up living in the disk buffers that it maintains.
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Re:I think tumblr has a huge security hole by moe on Saturday March 19, 2011 @10:42AM (#2343693)
The disk buffers make the operation cheap but not free, i.e. keeping the information cached is the right thing to do.
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