From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: kosaki.motohiro@jp.fujitsu.com, Gleb Natapov <gleb@redhat.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org, akpm@linux-foundation.org,
andrew.c.morrow@gmail.com,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
minchan.kim@gmail.com
Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag
Date: Wed, 20 Jan 2010 09:24:06 +0900 (JST) [thread overview]
Message-ID: <20100120091051.405D.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <84144f021001190044s397c6665qb00af48235d2d818@mail.gmail.com>
> 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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next prev parent reply other threads:[~2010-01-20 0:24 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-18 13:37 Gleb Natapov
2010-01-18 14:09 ` Pekka Enberg
2010-01-18 14:19 ` Gleb Natapov
2010-01-18 14:32 ` Alan Cox
2010-01-18 14:35 ` Gleb Natapov
2010-01-18 14:49 ` Peter Zijlstra
2010-01-18 15:01 ` Gleb Natapov
2010-01-18 15:06 ` Peter Zijlstra
2010-01-18 15:11 ` Avi Kivity
2010-01-18 15:14 ` Peter Zijlstra
2010-01-18 15:19 ` Avi Kivity
2010-01-18 15:24 ` Peter Zijlstra
2010-01-18 15:41 ` Alan Cox
2010-01-18 15:44 ` Peter Zijlstra
2010-01-18 17:11 ` Gleb Natapov
2010-01-18 15:14 ` Gleb Natapov
2010-01-19 0:12 ` KOSAKI Motohiro
2010-01-18 16:05 ` Pekka Enberg
2010-01-18 17:08 ` Gleb Natapov
2010-01-18 18:09 ` Pekka Enberg
2010-01-18 18:19 ` Gleb Natapov
2010-01-18 19:10 ` Alan Cox
2010-01-19 7:17 ` Gleb Natapov
2010-01-19 7:37 ` Pekka Enberg
2010-01-19 7:52 ` Gleb Natapov
2010-01-19 8:07 ` Pekka Enberg
2010-01-19 8:26 ` Gleb Natapov
2010-01-19 8:44 ` Pekka Enberg
2010-01-19 10:40 ` Gleb Natapov
2010-01-19 12:48 ` Minchan Kim
2010-01-19 13:18 ` Pekka Enberg
2010-01-19 13:26 ` Gleb Natapov
2010-01-20 0:24 ` KOSAKI Motohiro [this message]
2010-01-19 11:54 ` Alan Cox
2010-01-19 12:07 ` Gleb Natapov
2010-01-19 13:21 ` Alan Cox
2010-01-19 14:07 ` Minchan Kim
2010-01-19 14:14 ` Gleb Natapov
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