Date: Mon, 23 Nov 1998 17:47:24 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Terry Lambert <tlambert@primenet.com> Cc: joelh@gnu.org (Joel Ray Holveck), tlambert@primenet.com, DBECK@ludens.elte.hu, freebsd-hackers@FreeBSD.ORG Subject: Re: SYSV Semaphores & mmap problems Message-ID: <199811240147.RAA11543@apollo.backplane.com> References: <199811231937.MAA25048@usr02.primenet.com>
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The difference between mmap() and SysV shared memory isn't so bad. The
mmap()'d file will basically get synced every 30 seconds or so by the
syncer daemon. madvise() can be used to pre-fault any pages already in
the cache.
I think all that is needed is a way to flag a file so the syncer doesn't
touch it under normal circumstances, instead allowing its pages to be
synced by normal paging activity. You can then madvise(... MADV_FREE)
the pages after you are through with the shared memory segment to throw
them away.
-Matt
Matthew Dillon Engineering, HiWay Technologies, Inc. & BEST Internet
Communications & God knows what else.
<dillon@backplane.com> (Please include original email in any response)
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