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can shared cache be swapped to disk? - Mailing list pgsql-hackers

From flyusa2010 fly
Subject can shared cache be swapped to disk?
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Msg-id AANLkTinXXsbBArreoUm3gVekWUe24iTGTOc7c5gZ5H2v@mail.gmail.com
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Responses Re: can shared cache be swapped to disk?  (Jeff Janes <jeff.janes@gmail.com>)
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hi, folks!

I see that shared cache is implemented by system v shared memory. I wonder whether data in this area can be swapped out to disk. 
Isn't it bad that we read data from disk, put data in shared cache, and finally data in shared cache is swapped to disk again!

Why not use shmctl(..SHM_LOCK..) to pin data in main memory?

Thanks!

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