On 08/06/2013 10:52 AM, Stanislav Kholmanskikh wrote: > On 08/05/2013 07:41 PM, chru...@suse.cz wrote: >> Hi! > Hi, Cyril. >>> * kernel test for max_map_count_sysctl is: >>> /* Too many mappings? */ >>> if (mm->map_count > sysctl_max_map_count) >>> return -ENOMEM; >> Hmm, that looks like we allow the map_count to became one greater than >> max_map_count, is this known bug? > I'm not sure whether this is a bug or feature but in fact mm/mmap.c contains > this strict condition. > >>> so in LTP test map_count should be greater than max_map_count by 1 >>> >>> * only [vsyscall] is allocated without incrementing mm->map_count >> That also looks strange, do you know why one is allocated without >> incrementing it and another with? >> > [vdso] is allocated this way: > 1) load_elf_binary (fs/binfmt_elf.c) > 2) arch_setup_additional_pages (arch/x86/vdso/vdso32-setup.c) > 3) install_special_mapping (mm/mmap.c) > 4) insert_vm_struct (mm/mmap.c) > 5) vma_link (mm/mmap.c) increases mm->map_count++ > > I've not found where [vsyscall] may increment map_count.... Maybe it's > by design. > As I understand [vsyscall] was initially and intentionally implemented > as a 'hack' - mapping functions directly to process memory space. > On the other side [vdso], which is an elf object, and should be inserted > in a similiar way as all shared libraries do. > IMHO. > > And manual testing approves the assumption that [vdso] increments and > [vsyscall] - doesn't. > > Thank you. > > ------------------------------------------------------------------------------ > Get your SQL database under version control now! > Version control is standard for application code, but databases havent > caught up. So what steps can you take to put your SQL databases under > version control? Why should you start doing it? Read more to find out. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk > _______________________________________________ > Ltp-list mailing list > Ltp-list@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ltp-list
Guys, could anybody approve or disapprove this? I'm not sure where to go to complete this subject. ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ Ltp-list mailing list Ltp-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ltp-list
