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Date: Wed, 20 Jan 2010 09:24:06 +0900 (JST) From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: Pekka Enberg <penberg@...helsinki.fi> Cc: kosaki.motohiro@...fujitsu.com, Gleb Natapov <gleb@...hat.com>, Alan Cox <alan@...rguk.ukuu.org.uk>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, linux-api@...r.kernel.org, akpm@...ux-foundation.org, andrew.c.morrow@...il.com, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org>, minchan.kim@...il.com Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag > Hi Gleb, > > On Tue, Jan 19, 2010 at 10:26 AM, Gleb Natapov <gleb@...hat.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). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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