Kaustubh Kabra
2011-Jan-27 20:37 UTC
[Xen-devel] Bus error while allocating hugepages in domain 0
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>* _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Konrad Rzeszutek Wilk
2011-Feb-02 20:05 UTC
Re: [Xen-devel] Bus error while allocating hugepages in domain 0
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 usingI 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_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel