From: Pekka Enberg <penberg-bbCR+/B0CizivPeTLB3BmA@public.gmane.org>
To: Gleb Natapov <gleb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
andrew.c.morrow-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
"Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
minchan.kim-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag
Date: Tue, 19 Jan 2010 10:44:23 +0200 [thread overview]
Message-ID: <84144f021001190044s397c6665qb00af48235d2d818@mail.gmail.com> (raw)
In-Reply-To: <20100119082638.GK14345-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Hi Gleb,
On Tue, Jan 19, 2010 at 10:26 AM, Gleb Natapov <gleb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 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.
On Tue, Jan 19, 2010 at 10:26 AM, Gleb Natapov <gleb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>> me that you're trying to use a big hammer (mlock) when a polite hint
>> for the VM would probably be sufficient for it do its job.
>>
> I what to tell to VM "swap this, don't swap that" and as far as I see
> there is no other way to do it currently.
Yeah, which is why I was suggesting that maybe posix_madvise() needs
to be extended to have a MADV_NEED_BUT_LESS_IMPORTANT flag that can be
used as a hint by mm/vmscan.c to first swap the guest address spaces.
Pekka
next prev parent reply other threads:[~2010-01-19 8:44 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-18 13:37 [PATCH v6] add MAP_UNLOCKED mmap flag Gleb Natapov
[not found] ` <20100118133755.GG30698-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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
[not found] ` <4B547C09.8010906-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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
[not found] ` <20100119075205.GI14345-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-01-19 8:07 ` Pekka Enberg
2010-01-19 8:26 ` Gleb Natapov
[not found] ` <20100119082638.GK14345-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-01-19 8:44 ` Pekka Enberg [this message]
2010-01-19 10:40 ` Gleb Natapov
[not found] ` <84144f021001190044s397c6665qb00af48235d2d818-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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
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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