Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: Memory mapped files question | Date | 14 Apr 2003 11:07:09 -0700 |
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Followup to: <11640000.1050332688@[10.10.2.4]> By author: "Martin J. Bligh" <mbligh@aracnet.com> In newsgroup: linux.dev.kernel > > > Martin, something which was not mentioned last week (I've just checked). > > > > It's OK if we never write to disk unless explicitely told, but will we writeback > > when we munmap? > > Don't know for sure - you'd have to read the code (do_munmap) ... I couldn't > see anything there at a quick glance. However, I'd guess we don't write it, > as multiple people could have the file mapped, or we could remap it > again from somewhere. Presumably the standard LRU will just flush it out. >
munmap() and fsync() or msync() will flush it to disk; there is no reason munmap() should unless perhaps the file was opened O_SYNC.
-hpa
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