Re: SHM_LOCK question

From: Christoph Rohland (cr@sap.com)
Date: Tue Feb 26 2002 - 08:46:37 EST


Hi Badari,

On Mon, 25 Feb 2002, Badari Pulavarty wrote:
> I am trying to understand how SHM_LOCK works on 2.4.17.
> All I can see SHM_LOCKED set in shm_flags. I don't see how
> it is locking the pages (that are already existing or future
> pages). Can somebody explain ?

This flag prevents that the pages are written to swap. shmem_writepage
honors it. SHM_LOCK does _not_ force actually swapped out pages into
memory though.

Greetings
                Christoph

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