* Bus error while allocating hugepages in domain 0
@ 2011-01-27 20:37 Kaustubh Kabra
2011-02-02 20:05 ` Konrad Rzeszutek Wilk
0 siblings, 1 reply; 2+ messages in thread
From: Kaustubh Kabra @ 2011-01-27 20:37 UTC (permalink / raw)
To: Xen-devel
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Hi,
My dom 0 is jeremy kernel 2.6.32.27 with 3.5 GB allocated memory. I tried
allocating 700 huge pages in domain 0 using-
]echo 700 > /proc/sys/vm/nr_hugepages
To verify -
]cat /proc/meminfo |grep Huge
HugePages_Total: 700
HugePages_Free: 0
HugePages_Rsvd: 18446744073709551019
HugePages_Surp: 0
Hugepagesize: 2048 kB
This memory information is not as per expectation.
Can anyone explain whether it has really allocated huge pages as calling
mmap with MAP_HUGETLB using
]addr = mmap((void *)0x0UL,600UL*1024*1024 , PROT_WRITE,MAP_PRIVATE |
MAP_ANONYMOUS | MAP_HUGETLB , 0, 0);
also results into a bus error.
]dmesg-
Process 4617(a.out) has RLIMIT_CORE set to 0
Aborting core
]strace-
--- SIGBUS (Bus error) @ 0 (0) ---
+++ killed by SIGBUS +++
Bus error
--
Kaustubh Kabra* <http://www.kaustubhwise.000a.biz>*
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* Re: Bus error while allocating hugepages in domain 0
2011-01-27 20:37 Bus error while allocating hugepages in domain 0 Kaustubh Kabra
@ 2011-02-02 20:05 ` Konrad Rzeszutek Wilk
0 siblings, 0 replies; 2+ messages in thread
From: Konrad Rzeszutek Wilk @ 2011-02-02 20:05 UTC (permalink / raw)
To: Kaustubh Kabra, dcm; +Cc: Xen-devel
On Fri, Jan 28, 2011 at 02:07:52AM +0530, Kaustubh Kabra wrote:
> Hi,
>
> My dom 0 is jeremy kernel 2.6.32.27 with 3.5 GB allocated memory. I tried
> allocating 700 huge pages in domain 0 using-
> ]echo 700 > /proc/sys/vm/nr_hugepages
>
> To verify -
> ]cat /proc/meminfo |grep Huge
> HugePages_Total: 700
> HugePages_Free: 0
> HugePages_Rsvd: 18446744073709551019
> HugePages_Surp: 0
> Hugepagesize: 2048 kB
>
> This memory information is not as per expectation.
> Can anyone explain whether it has really allocated huge pages as calling
> mmap with MAP_HUGETLB using
I think that is right. You did try this on baremetal and it worked right?
It looks as if we just haven't implemented this correctly, but I thought
Dave had it fixed at some point?
Ah wait.. http://lists.xensource.com/archives/html/xen-devel/2010-04/msg00971.html
it even is mentioned in
http://wiki.xensource.com/xenwiki/XenUpdate20100423
>
> ]addr = mmap((void *)0x0UL,600UL*1024*1024 , PROT_WRITE,MAP_PRIVATE |
> MAP_ANONYMOUS | MAP_HUGETLB , 0, 0);
>
> also results into a bus error.
>
> ]dmesg-
> Process 4617(a.out) has RLIMIT_CORE set to 0
> Aborting core
>
> ]strace-
> --- SIGBUS (Bus error) @ 0 (0) ---
> +++ killed by SIGBUS +++
> Bus error
>
> --
> Kaustubh Kabra* <http://www.kaustubhwise.000a.biz>*
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
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