[Xen-devel] Bus error while allocating hugepages in domain 0

[Kaustubh Kabra <kaustubhwise@xxxxxxxxx>]

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


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