[oe] some possible fixes in the OE web pages
Martin Jansa
martin.jansa at gmail.com
Thu May 13 06:40:37 UTC 2010
On Thu, May 13, 2010 at 09:53:54AM +0400, Roman I Khimov wrote:
> В сообщении от Четверг 13 мая 2010 01:30:53 автор Robert P. J. Day написал:
> > * on http://wiki.openembedded.net/index.php/OEandYourDistro#Ubuntu,
> > there's a reference to configuring for qemu-arm:
> >
> > echo 128 > /proc/sys/vm/mmap_min_addr
> >
> > from memory, i always simply set that to zero on fedora. is there
> > something magic about the value 128? at the moment, it's at the
> > default value of 65536 on this ubuntu system.
>
> With current qemu in OE mmap_min_addr tricks are not needed at all.
Hi,
On some systems (I have report from fedora and kubuntu) it still needs 0
in mmap_min_addr :/.
Investigating why, but it's slow because it doesn't fail on my box.
My guess is that this chunk from
http://git.qemu.org/qemu.git/tree/linux-user/main.c
cannot work on systems where normal user is not allowed to read
/proc/sys/vm/mmap_min_addr and mmap_min_addr is not initialized with
sane value.
/*
* Read in mmap_min_addr kernel parameter. This value is used
* When loading the ELF image to determine whether guest_base
* is needed. It is also used in mmap_find_vma.
*/
{
FILE *fp;
if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
unsigned long tmp;
if (fscanf(fp, "%lu", &tmp) == 1) {
mmap_min_addr = tmp;
qemu_log("host mmap_min_addr=0x%lx\n", mmap_min_addr);
}
fclose(fp);
}
}
But here (gentoo) it works ok with 4096 in mmap_min_addr and qemu-native
from OE as well as app-emulation/qemu-kvm-0.12.3* from gentoo.
BTW: 0.12.4 is out, but in changelog I don't see anything I must have.
Regards,
--
uin:136542059 jid:Martin.Jansa at gmail.com
Jansa Martin sip:jamasip at voip.wengo.fr
JaMa
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