From: Richard Henderson <rth@twiddle.net>
To: Alexander Graf <agraf@suse.de>
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Paul Brook" <paul@codesourcery.com>,
"Riku Voipio" <riku.voipio@iki.fi>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"Andreas Färber" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [PATCH 2/9] alpha-linux-user: Work around hosted mmap allocation problems
Date: Tue, 12 Jun 2012 07:57:11 -0700 [thread overview]
Message-ID: <4FD758C7.4000207@twiddle.net> (raw)
In-Reply-To: <E9150EA6-7F82-4867-87A1-DE0598E9276A@suse.de>
On 2012-06-12 07:53, Alexander Graf wrote:
>
>
> On 12.06.2012, at 16:27, Richard Henderson <rth@twiddle.net> wrote:
>
>> On 2012-06-12 07:12, Andreas Färber wrote:
>>> This looks fishy to me... why should the kernel use a bigger address
>>> space than hardware? For arm on x86_64 such a workaround was not
>>> necessary iirc.
>>
>> I can tell you what I observe. That with a certain sequence of
>> allocations the x86_64 kernel will quit accepting an address "near"
>> (1<<38) as a hint for where to allocate memory and begin returning
>> an addresses near (1<<48).
>
> Hrm, does -R work for you? :)
Lol.
Actually I've tried it a couple of times: -R 32G. And, no, it
doesn't work very well. ;-)
r~
next prev parent reply other threads:[~2012-06-12 14:57 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-07 22:24 [Qemu-devel] [PATCH v3 0/9] {alpha-}linux user improvements Richard Henderson
2012-06-07 22:24 ` [Qemu-devel] [PATCH 1/9] alpha-linux-user: Fix signal handling Richard Henderson
2012-06-22 14:10 ` Peter Maydell
2012-06-07 22:24 ` [Qemu-devel] [PATCH 2/9] alpha-linux-user: Work around hosted mmap allocation problems Richard Henderson
2012-06-12 14:12 ` Andreas Färber
2012-06-12 14:27 ` Richard Henderson
2012-06-12 14:53 ` Alexander Graf
2012-06-12 14:57 ` Richard Henderson [this message]
2012-06-12 15:11 ` Alexander Graf
2012-06-12 15:27 ` Richard Henderson
2012-06-07 22:24 ` [Qemu-devel] [PATCH 3/9] alpha-linux-user: Handle TARGET_SSI_IEEE_RAISE_EXCEPTION properly Richard Henderson
2012-06-07 22:24 ` [Qemu-devel] [PATCH 4/9] linux-user: Handle O_SYNC, O_NOATIME, O_CLOEXEC, O_PATH Richard Henderson
2012-06-22 14:15 ` Peter Maydell
2012-06-07 22:24 ` [Qemu-devel] [PATCH 5/9] linux-user: Allocate the right amount of space for non-fixed file maps Richard Henderson
2012-06-07 22:24 ` [Qemu-devel] [PATCH 6/9] linux-user: Translate pipe2 flags; add to strace Richard Henderson
2012-06-22 14:18 ` Peter Maydell
2012-06-07 22:24 ` [Qemu-devel] [PATCH 7/9] alpha-linux-user: Fix a3 error return with v0 error bypass Richard Henderson
2012-06-07 22:24 ` [Qemu-devel] [PATCH 8/9] alpha-linux-user: Properly handle the non-rt sigprocmask syscall Richard Henderson
2012-06-22 14:27 ` Peter Maydell
2012-06-07 22:24 ` [Qemu-devel] [PATCH 9/9] alpha-linux-user: Fix the getpriority syscall Richard Henderson
2012-06-12 13:48 ` [Qemu-devel] [PATCH v3 0/9] {alpha-}linux user improvements Richard Henderson
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