Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [PATCH v6] add MAP_UNLOCKED mmap flag | Date | Wed, 20 Jan 2010 09:24:06 +0900 (JST) |
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> Hi Gleb, > > On Tue, Jan 19, 2010 at 10:26 AM, Gleb Natapov <gleb@redhat.com> wrote: > >> design would still be broken, no? Did you try using (or extending) > >> posix_madvise(MADV_DONTNEED) for the guest address space? It seems to > > After mlockall() I can't even allocate guest address space. Or do you mean > > instead of mlockall()? Then how MADV_DONTNEED will help? It just drops > > page table for the address range (which is not what I need) and does not > > have any long time effect. > > Oh right, MADV_DONTNEED is no good.
Off topic:
posix_madvise(MADV_DONTNEED) is nop. glibc's posix_madvise(MADV_DONTNEED) don't call linux's madvise(MADV_DONTNEED). It's because madvise(MADV_DONTNEED) is not POSIX compliant.
The behavior of linux madvise(MADV_DONTNEED) is similar to Solaris (or *BSD) madvise(MADV_FREE).
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