From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Bus error while allocating hugepages in domain 0 Date: Wed, 2 Feb 2011 15:05:02 -0500 Message-ID: <20110202200502.GA19684@dumpdata.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Kaustubh Kabra , dcm@mccr.org Cc: Xen-devel List-Id: xen-devel@lists.xenproject.org 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* * > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel