On Mon, Sep 01, 2008 at 12:59:28PM +0530, Balbir Singh wrote: > While trying to build the memory resource controller with the latest > kernel source, I saw the following in config-generic > > #NOTE: Before changing the size below, take notice that page struct > will grow past a cacheline on 32 bit. > > I am running F10-alpha 32 bit version, on which I see > > Linux localhost.localdomain 2.6.27-0.166.rc0.git8.fc10.i686 #1 SMP Mon > Jul 21 20:51:26 EDT 2008 i686 i686 i386 GNU/Linux > > sizeof(vma)=84 bytes > sizeof(page)=56 bytes > sizeof(inode)=608 bytes > sizeof(dentry)=160 bytes > sizeof(ext3inode)=860 bytes > sizeof(buffer_head)=56 bytes > sizeof(skbuff)=184 bytes > sizeof(task_struct)=6056 bytes > > With size at 56 bytes, I don't think adding 4 bytes will affect the > growth beyond cacheline size. Yes, but that's with debug options on. With debug options off, on 32bit we're currently at exactly a 32 byte cacheline, so adding a member for CGROUP will push us past 1 cacheline. > I suspect that there are a few debugging options turned on, that are > causing either spinlock_t to bloat or something that CONFIG_PAGE_OWNER > is turned on. Are these debugging options going to go away as we head > towards F10 release? Yes. Dave -- http://www.codemonkey.org.uk -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
